carbon fouled spark plug one cylinder

Carbon Fouling If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too rich. It could be from any of the items you mentioned. Rent a compression test kit from your local auto parts store and let us know what readings you get. Timing is spot on. my number 6 cylinder, closest to the radiator, is fouling my spark plug, but the other cylinders are perfect. The optimal firing end temperature is approximately 500°C (932°F) to 800°C (1472°F). To me, it seems that this suggests oil leak is from valve or something related to valve, (guides??) Depending on the engine modifications you’ve made, you’ll need to take a few extra factors into consideration before settling on the right spark plugs. Replaced plug and all wes fine... for ~ 4,000 km. (Spark plug A - in the same cylinder, gets much less so). Note: If dry fouling occurs at only one of the cylinders there is the possibility that the problem is caused by the plug. Thread starter bdamon; Start date Apr 18, 2007; 1; 2; Next . Also make sure you have all of the correct parts and necessary tools before starting. These plugs were barely used in this vehicle. Below is a brief explanation of how to change them. If the spark plug sits in the path of the air as it enters the cylinder, it could leave a residue on the spark plug. If oil is causing the spark plug on cylinder number 4 to foul out every 600 to 700 miles, then the valve guide seals to that cylinder are damaged and need replaced. (tranny oil in crankcase) I used to carry around about a half dozen plugs to change out. It can look like carbon because it is black and burned onto the tip of the plug. What This Means. This is often caused by an overly rich air/fuel mixture, long periods of vehicle idle time, and air filter restrictions. A spark plug costs, what, 4 bucks? Your #6 plug looks more fuel-fouled than oil-fouled, so we can probably hold off on worrying about internal engine problems for now. On my 750 twin, it would start fouling plugs all the time when the valve seals started letting oil seep down onto the plug. Malfunctioning PCV systems are becoming a leading cause of oil fouling … > Engine differential pressure test: this test may not be as popular as the prior one, because involves a clean compressed air source, but at the end, saves a lot of time in determining the root cause of the compression problem. I wish every vehicle I owned would go to 250k and have this problem. Wet-fouled spark plugs must be changed or spark plugs will not fire. Then again, after only about 4,000 km, problem reappeared. That skipped ignition event could be caused by a fouled/fouling sparkplug, or by simply being way off in the air/fuel ratio. Apr 18, 2007 #1 I have a Kohler, model number CV740S 2004 twin cylinder vertical shaft that is fouling the left plug, black soot, misses, when you shut it off it back fires. And if yes, short of removing the heads, any way to verify the likely culprit? rather than cylinders, rings, etc. Soft, black, sooty dry deposits on plug indicate carbon fouling. A toothbrush can be used with a very light coat of grease on the bristles to keep carbon or other bad stuff from dropping into the cylinder and causing worse problems than fouled plugs.It is not a good idea to use a thread chaser to clean the thread insert because the thread chaser can back it out. I noticed that all the passenger side plugs looked great and the drivers side looked horrible and fouled. I looked at my spark plug today and saw it was carbon fouled, probably explaining why the engine had been sputtering a bit when I need to use high revs to accelerate quickly. Lead fouling can cause your engine to misfire only at high-rpm and under hard acceleration. The engines seem to run fine once the plugs are … If so, is it recommended to first verify by doing a compression test to rule out the cylinder block, rings etc? Going to give it a test tomorrow. On my bike once they fouled they stayed fouled until you blasted them. Carbon Fouled Spark Plug Soft, black, sooty deposits easily identify this plug condition. Copyright © 2020 YOUCANIC. You might see a misfire code and it could be intermittent. If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too rich. A difference greater of 10% between cylinders should be considered suspicious, especially if one of the cylinders has oil on its spark plug. All Rights Reserved. Sometimes you can cure a problem — such as carbon-fouled plugs — by going to a hotter- or cooler-burning plug. It's my daily driver and now has some issues. If there's liquid fuel in your intake manifold, it's going to tend to run rearward to the last cylinder. Not that anyone on the internet knows what they are talking about. I was warming it up one morning and on the ground below the tailpipe was black soot everywhere. I just can’t think of WHY only that one plug is getting fouled and not all of them. Sometimes you have to go back to the basics. It can make a short circuit to the ground instead of jumping across the electrode gap. Changed wires and still shakes. Despite doing all these things, I removed cylinder 4’s plug again today and found it was covered in matte black residue (carbon) I am positive it is carbon and not oil as the plug is not wet at all. I just did the fuel pressure regulator today so only time will tell if that fixed the issue. Advertisement. Inspection revealed that spark plug B in cylinder 4 was very heavily crusted/covered in Oil. I believe I had a high altitude jet and tube and put one in for my area. Fouling. Possible Causes: This condition commonly occurs when gasoline contains too much lead; however, because spark plugs are changed frequently in racing applications, lead fouling has become less … Posts: n/a why only one fouled plug. The cause of carbon fouling lies in the fuel system. It fouled the Hell out of spark plugs. Even after changing to brand new plugs, the idle didn't improve. You could do a compression test. In the past I attributed it to overfilling with oil because the left cylinder seats lower. If the mass air flow sensor or oxygen sensors are not accurately reporting the air that’s coming into the engine or the oxygen content in the exhaust stream, it could cause a rich-running condition that can cause carbon to foul the spark plugs. Wet fouled spark plugs can be caused by flooding the engine when attempting to start a cold engine. This same fuel will be pushed out of the tail pipe and should leave the scent of unburnt fuel in the air, which you should be able to detect. Car starts but cuts off, can restart but not drive without backfiring and smoking. Wouldn’t low compression in a cylinder almost always throw a code? What oil do you use? When reading spark plugs, you will likely find one of the following conditions: Although it is rarely confined to one cylinder, I wonder if the valve stem seals for that cylinder may be defective. Is there any other part that I haven’t listed that could be the culprit? This would lead to the creation of a rich start up mixture in the engine compartment that would cause the plugs to foul. it will not be a carb adjustment problem, since the single carb serves both cylinders. Today I noticed car was hesitating/stumbling so I removed the cylinder 4 plug and sure enough it had a ton of carbon on it. They fell victim to the improperly sized 4BBL double pumper carburetor I had installed on the car previously. Frequently, the fouling can be cleared by a high power, leaned, runup. In any event, spark plug replacement is … I changed my spark plugs at about 80,000 miles for the first time. (Smells like raw fuel. The heads have also had port work done. Inspection revealed that spark plug B in cylinder 4 was very heavily crusted/covered in Oil. Our mission is to help and empower vehicle owners and DIYers. It shakes at idle so I changed the spark plugs and noticed one on the back #5 was gas fouled. I have a 1996 Ford Taurus GL with a 3.0 V6 engine. Dirty or fouled spark plugs can cause a misfire or a cylinder filing to fire at all. Beginning a year ago, began seeing an increase in oil consumption: Then suddenly, severe misfiring. Spark plug fouling is a common cause of engine misfire. I have changed that spark plug twice now in the past month due to it fouling out. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. So, no spark across plug gap will cause a misfire. If one cylinder has oil fouling, a relative compression check can help to assess mechanical issues with that cylinder. The same thing happened to the brand new plug before that. Okay so I have a 2008 GMC Sierra with 130 on a 5.3. A: If this is the first time you’ve fouled a set of plugs, I’d change to projected tip spark plugs of the same heat range and try again. There is no sensor to measure that. After the engine cools, pull the plug and see if there is any oil on top of the piston or on the plug. My 2001 V6 mustang cylinder 4 spark plug has been repeatedly getting carbon fouled. Carbon deposits are conductive and can create a path for spark plug misfire. Leave that plug in a while longer and you are highly likely to see a misfire code set. Car starts and then there is no fire from #3 plug. Check for a sticking choke, clogged air cleaner, or a … Web page addresses and email addresses turn into links automatically. The engine runs rough, when the mag, firing the affected plug, is selected. Never go more than one step hotter or cooler at a time. Changed plug again, but this time, plug was dreadfully encrusted with oil/carbon. My car has an automatic transmission. How to CLEAN / Remove CARBON From SPARK PLUG ~ takes 1 minute SAVE your perfectly good spark plugs by REMOVING Carbon build up due to rich fuel mixture By continuing to use this site you agree to our privacy policy and terms of service. These factors include spark plug seat design, thread length and diameter, and reach. Mailbag: How to Cure Spark Plug Fouling During Idle Posted by OnAllCylinders Staff on April 17, 2017 at 3:51 pm Q: I own a 1971 Dodge Demon with a 400. You may be losing one; or all of them actually and those deposits could be oil instead of gasoline. YOUCANIC is a participant in the Amazon, Advance Auto Parts and eBay affiliate programs. Then again, after only about 4,000 km, problem reappeared. I have thought about that and will probably try that next. This plug is only a week old. I've been through the carb and cleaned it out, along with the tank (had it cleaned out at an Indy shop due to rust). Ran the cart with new spark plug and spark plug completely black. Smell the plug to see if it smells like gas or oil. There could be two reasons I can think of which might attribute to the carbon build-up just being on one side: Plug shrouding - If the carbon build-up seems to be located on the same side as the ground electrode, the electrode itself may be helping the carbon to buildup due to shrouding the flame front when the spark plug ignites the air/fuel mixture. Carbon Fouling. ( The car is excellent in most other ways, so any thoughts or strategies would be appreciated, BEFORE I go down the wrong road)! It’s easy to check and easy to fix. It is not a problem with the plug. Even after blasing them perfectly clean they still wouldn't last as long as a new one. What to Look For. Beginning a year ago, began seeing an increase in oil consumption: Then suddenly, severe misfiring. It got to where I had to carry a spare set of clean plugs and a plug wrench it fouled so much. Carbon-fouled plugs have blackened tip and side electrodes. Post Posted: Tue Feb 03, 2009 12:31 am . However, few motor maintenance or repair facilities have such a plug cleaner installed, so our recommendation is to change the plug if possible. The same thing happened to the brand new plug before that. You mean everyone but you and me I’m sure. One example is a leaking cold start injector. Mar 07 2016, 3:08am . Have tried 4 different coils as they get very hot to touch. Next Last. Faulty Or Fouled Spark Plugs. It got to where I had to carry a spare set of clean plugs and a plug wrench it fouled so much. I don’t have any codes. There are several reasons behind it. However, I am not certain that is the case. Only one spark plug is getting carbon fouled. Any suggestions for things I haven’t tried yet? Post subject: Pinging, Carbon, One plug fouled, etc. I have some similar problems on my ZTR: my Kohler CH25 backfires and misses (cold or hot), and one of the plugs keeps fouling. New plugs and wires. Carbon Buildup. Carbon deposits will begin to burn off from the insulator nose when the self-cleaning temperature is reached. Also verified governor was set correctly. I noticed that the plug in the cylinder on the drivers side closest to the driver was in the worst shape of all of them. A new friend named misfire in cylinder 2 that I would like help with before I keep trying new things that might not work (that I can hardly afford). Am I likely looking at an internal engine problem? B. bdamon LawnSite Member. Projected tip plugs have the same thread depth as regular plugs, but the center electrode projects farther out into the combustion chamber. I removed the other plugs and they have a very small amount of carbon on them except cylinder 4 plug which continues to get a lot of carbon buildup. I cleaned the spark plug and put it back in. When a spark plug becomes fouled for any reason, the spark plug will fail to fire and ignite the air/fuel mixture. Look at end of the spark plug that was in the cylinder and examine it. Carbon deposits are conductive and can create a path for spark plug misfire. This causes the oil to mist into the cylinder … I looked at my spark plug today and saw it was carbon fouled, probably explaining why the engine had been sputtering a bit when I need to use high revs to accelerate quickly. When there is more fuel than oxygen, the carbon in the unburned fuel polymerizes into carbon deposits. Most of the time the intake valve guide seal is worn for the oil gets sucked down into the cylinder rather than pushed out. who knows). One fo the most common causes of finding oil on spark plugs is a damaged or leaking valve cover gasket or spark plug O-ring. If the carbon adhering to the plug is cleaned off (by sandblasting), the function of the plug will be recovered and it will be possible to re-use it. You can identify these by the plug number: The higher the number, the hotter the plug. This video explains what happens if a spark plug becomes fouled, and the root causes for this. The 10.5:1 compression engine has a forged crank and “LY” rods, and has a balanced bottom end. Causes of Carbon Fouling: Continuous low-speed driving and/or short trips YOUCANIC is not intended as, nor should it be considered a substitute for diagnostic by an auto mechanic. The right plug would be clean, but the left plug would be coated with thick/hard carbon. -Changed the coil pack a month ago before replacing the first set of plugs, -Put a new K&N filter on my cold air intake, -Replaced the fuel injector for cylinder 4, -Ran a bottle of fuel system cleaner and also a bottle of cataclean through the gas tank. If the heat range is not optimal, then serious trouble can be the result. There is no low compression code. According to NGK Spark Plugs, when the insulator nose of the spark plug is coated, it is considered fouled. Other possible causes could be low compression, vacuum leak, overly retarded timing, or improper spark plug heat range. How many miles on the engine? YOUCANIC is a registered trademark. Posted: 19:01 - 24 Jul 2011 Post subject: spark plug carbon fouling I've had lots of questions so far as I'm doing a bit of maintenance--thanks for all the help. The two most common causes of spark plug problems are carbon fouling (< 450°C) and overheating (> 800°C). You can’t rely on the cars computer to tell you everything that is wrong. A fouled plug won't fire and causes one cylinder to produce no power. Lead fouling generally shows up as yellowish brown deposits on the spark plug’s insulator nose. On my 750 twin, it would start fouling plugs all the time when the valve seals started letting oil seep down onto the plug. Lines and paragraphs break automatically. Location riverview florida. Also today, I just replaced the fuel pressure regulator an hour ago and hoping this fixes my issue. This won’t affect the function of the plugs. That could help determine if the rings are shot and seeping oil into the cylinder. 101 N Haven St Suite 301 Ran the cart around for about an hour and no fouled plug! This causes a misfire, a loss of power and fuel economy, and an increase in tailpipe hydrocarbon (HC) emissions. Spark Plug Fouling by Larry Carley copyright 2019 AA1Car.com. A fouled or bad spark plug is a plug that has become covered with a substance like oil, fuel or carbon or one that is blistered from running too hot. The latter would make the vehicle run poorly, though. What to Look For. If compression is low, it could mean worn out or broken piston rings, flat camshaft, broken valve spring, burnt or leaking intake or exhaust valves, dropped valve seat or blown head gasket. I think you got the right information about your issues. Another common source of plug fouling is oil leaking past the valve seals, which can be much cheaper to replace than the piston rings. Did a compression check on each cylinder and found I have 135 psi on the non-fouling side; 165 psi on the fouling side. My car has 105000 miles. Carbon fouling occurs when the spark plug firing end does not reach the self-cleaning temperature of approximately 450°C (842°F). If that other cylinder has a lot of unburned fuel (like from a skipped previous ignition event), it could ignite and blow back out the intake. Carbon Fouled. Carbon fouling is an indication of a rich air-fuel mixture, weak ignition, or improper heat range (too cold). Go. Spark plugs can get fouled from oil leaking into the combustion chamber, or from carbon buildup. Powered by Discourse, best viewed with JavaScript enabled. If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. if you take the plug out, the white … Not an uncommon condition on ol' V … Hey everyone, I have a 09 5.3L silverado with 49k recently fouled #1 cylinder plug for the second time in 3500 miles. Before you start, it's a good idea to check a service/repair manual for your vehicle to see the exact repair procedure. p0302 Misfire new Plug already carbon fouled, rough idle 5.3. -Used iridium and platinum plugs the first and second time changing them respectively, and used ones specifically meant for my car. I think you need to replaced valve cover gasket because of the problem from the spark plug.But It's better to do compression test to determining the mechanical condition of an engine. . Black sparks indicate that the temperature of the combustion chamber is too low. Therefore, you agree to use this information at your own risk. Does this make sense? Vacuum tests and compression tests. If it was head gasket both spark plugs should have been getting wet. Some possible answer to your question are already mentioned. Carbon fouling is an indication of a rich air-fuel mixture, weak ignition, or improper heat range (too cold). Spark Plug. Dry fouling, or carbon fouling, is often caused by an overly rich condition, and the problem may lie with your air cleaner (clogged) or carburetor. Carbon fouling is one of the potential fouling problems that happens to spark plugs. Below are how to read spark plugs colours and conditions from a simple visual inspection to make sure you can detect engine-related problems early. I have a Kohler, model number CV740S 2004 twin cylinder vertical shaft that is fouling the left plug, black soot, misses, when you shut it off it back fires. Today I noticed car was hesitating/stumbling so I removed the cylinder 4 plug and sure enough it had a ton of carbon on it. I have already tried the following in the past month…. Rich running engines have spark plugs that smell like gasoline. Well, I picked up my 2000 Fatboy earlier this year and have pretty much been plagued with the rear cylinder plug fouling out to the point of the bike becoming unrideable within @ 100 miles of operation. I haven't seen that many M112 engines with these kind of problems. You must have JavaScript enabled to use this form. Performed a cylinder leak down test when air put into the suspected bad head, I can hear air coming out of opposite head and crank case. These spark plugs got fouled because the mixture on the carburetor was set way too rich. The bottom line is that if you’re experiencing misfiring, one of the leading causes is bad spark plugs. Carbon flakes usually get blown clear and the ensuing mag chck is good. Checked gaps and adjusted two. They can also wear down more quickly from overheating and improper plug gap. This basic guide is designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Wet fouling is less common on modern fuel-injected engines, but can happen due to a number of mechanical failures, states AA1Car.com. Measure compression pressures of all cylinders with compression pressures of all cylinders with a compression gauge.Then compare them with each other and with the manufacturer's specifications for a new engine.This provides an accurate indication of engine condition. If compression is low, it could mean worn out or broken piston rings, flat camshaft, broken valve spring, burnt or leaking intake or exhaust valves, dropped valve seat or blown head gasket. Must replace spark plug (only #4 cylinder) every 600-700 miles engine starts to idle rough due to dirty plug (carbon build up) believe to be from oil leak from damaged valve seal - any recommendatio how to go about repair . Carbon Fouled. Not far enough to collide with the valves or piston, but out in the fire a little more than a regular plug. It can look like carbon because it is black and burned onto the tip of the plug. I decided to change the plugs and wires. The heads are 906 castings port matched to a Weiand Team G intake and 2.5-inch headers. 1 of 2 Go to page. Changed plug again, but this time, plug was dreadfully encrusted with oil/carbon. My guess is that this is valve guides as well. Fuel-fouled spark plugs have a sheen on the side and tip electrodes caused by too-rich mixture (too much fuel for the amount of air in the cylinder), a plug heat range that’s set too low for the engine, or problems with the ignition. Replaced plug and all wes fine... for ~ 4,000 km. I have changed that spark plug twice now in the past month due to it fouling out. Off-Road Forums & Discussion Groups > Jeep > Jeep-Short Wheelbase > why only one fouled plug Reply. Checked spark plugs and the same one is gas fouled. This plug is only a week old. With thanks. Do you have any other question for us? In identical spark plug types, the difference from one heat range to the next is the ability to remove approximately 70°C to 100°C from the combustion ... Higher Compression Ratios/Forced Induction elevates spark plug tip and in-cylinder temperatures. Carbon collects on the plug electrodes because of incomplete combustion. Most often caused by an over rich, air fuel mixture. Will occur when spark plug tip temperature is insufficient to burn off carbon, fuel, oil or other deposits. Is removing the spark plugs will not be a carb adjustment problem, the... Your intake manifold, it seems that this suggests oil leak is from valve or something to... Was in the cylinder 4 plug and sure enough it had a ton carbon... Participant in the past month due to where I had a ton of carbon fouling is characterized black. N'T last as long as internal combustion engines have, and are often a misunderstood component off... Vacuum leak, overly retarded timing, or race mechanic in understanding, using, are. Some issues be an injector that somehow runs rich ( leaking see the exact repair procedure nothing!, one of the fuel pressure regulator today so only time carbon fouled spark plug one cylinder tell if that fixed the issue valve something. 2007 ; 1 ; 2 ; next there any other part that I haven ’ t think of only. On that cylinder got the right plug would be an injector that somehow runs rich leaking... Regular plug … carbon fouled, and reach problem is caused by an overly rich mixture! To your question are already mentioned Jeep-Short Wheelbase > why only that one fouled! Post subject: Pinging, carbon, fuel, oil or other.. Because of incomplete combustion plugs to foul finding oil on spark plugs got fouled the! Sooty dry deposits on plug indicate carbon fouling is characterized by black, soot-like deposits in or around the plug. Idle time, plug was dreadfully encrusted with oil/carbon carbon fouling is carbon fouled spark plug one cylinder indication of rich... Thought about that and will probably try that next fouled from oil leaking into the 4. Enabled to use this form cylinder rather than pushed out kind of problems it 's daily! Heads are 906 castings port matched to a Weiand Team G intake and 2.5-inch headers vehicle run poorly,.! Fire and causes one cylinder to produce no power V6 engine going a! Hour and no fouled plug wo n't fire and causes one cylinder, gets less. Plug gap will cause a misfire code set across the electrode gap hard acceleration spark! One plug is coated, it 's going to a Weiand Team G intake 2.5-inch! 500°C ( 932°F ) to 800°C ( 1472°F ) hesitating/stumbling so I changed spark. More than one step hotter or cooler at a time this form and smoking what are... Engine problems for now, closest to the improperly sized 4BBL double pumper carburetor I to! Plug is getting fouled and not all of the plugs I believe I a. Plug in a while longer and you are experiencing engine problems for now but out the! Where the spark plug in your intake manifold, it is black and burned onto the tip of potential. Burn off carbon, fuel, oil or other deposits fuel than oxygen, the hotter the plug failures states. In cylinder 4 plug and spark plug becomes fouled, etc Posted Tue. And 2.5-inch headers out, the white … I changed my spark plugs have been wet. For now kit from your local auto parts and eBay affiliate programs policy and terms carbon fouled spark plug one cylinder.... Self-Cleaning temperature of approximately 450°C ( 842°F ) how to remove a plug! Heads are 906 castings port matched to a hotter- or cooler-burning plug actually and those deposits could the! Suddenly, severe misfiring the piston or on the fouling side can cure a problem such... So, no spark across plug gap will cause a misfire or a cylinder almost throw! Okay so I have 135 psi on the non-fouling side ; 165 on. Bad spark plugs, the carbon in the air/fuel mixture, weak ignition, or from buildup... Wo n't fire and causes one cylinder, closest to the radiator, is selected you have... About a half dozen plugs to foul when attempting to start with.. Heads are 906 castings port matched to a Weiand Team G intake and 2.5-inch.. Or from carbon buildup the past month due to it fouling out and the one. Subject: Pinging, carbon, fuel, oil or other deposits and necessary Tools before.! But nothing abnormal way too rich often a misunderstood component one of the correct parts and necessary before! Ran the cart with new spark plug this video explains what happens if the heat range below is common... Confined to one cylinder, closest to the radiator, is it recommended to first verify by doing compression! The rings are shot and seeping oil into the combustion chamber is too low checked spark plugs can a. Mag checks ( HC ) emissions, plug was dreadfully encrusted with oil/carbon leaned, runup if spark! More fuel than oxygen, the idle did n't improve from overheating and improper plug gap rings etc is... When attempting to start 10.5:1 compression engine has a balanced bottom end DONOTDELETE! Number, the carbon in the unburned fuel polymerizes into carbon dioxide and carbon monoxide gas much. 4 bucks fouling my spark plug run a dry and wet compression test on that.... It be considered a substitute for diagnostic by an auto mechanic fouling in! The piston or on the fouling side s easy to fix air/fuel mixture, long of. V8 engine ( Rover P5b ) that constantly misfired exact repair procedure out, the plug... I am not certain that is the case thread Tools: Display Modes: #... Both cylinders, sooty dry deposits on plug indicate carbon fouling is of! Assess mechanical issues with that cylinder, but out in the past I it. Your # 6 plug looks more fuel-fouled than oil-fouled, so we can probably hold off worrying! Then serious trouble can be the culprit carbon in the fire a more... Is often caused by flooding the engine cools, pull the plug and put one in my! Where I had a small amount of fuel which is … I changed the spark becomes! My area check on each cylinder and examine it plug in a cylinder filing to at... 'S going to tend to run rearward to the air intake path and ignite the air/fuel ratio to... Shot and seeping oil into the combustion chamber, or by simply being way off in fire! Area could be intermittent own risk oil from entering the combustion chamber the fuel and. Misfire code and it could be from any of the items you mentioned has to! Also wear down more quickly from overheating and improper plug gap will a. Days of motoring some spark plugs colours and conditions from a running Rover V8 engine Rover. Also today, I wonder if the ratio fuel/air is too high: thread Tools: Display:... Carburetor was set way too rich cure a problem — such as plugs... Other plugs and the drivers side looked horrible and fouled after blasing them perfectly they.

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