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Signs of misgaped spark plugs

What are the signs of misgapped spark plugs?

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88k15005.7l spark at coil none at plug mod. tested good


Spark at the coil and none reaching the plug would indicate faulty plug wires or possibly distributor cap or rotor arm if fitted.

Checking the condition of such things is part of routine maintenance and a failure of any of those components is a sign of maintenance not carried out or not carried out very thoroughly.

Jul 22, 2016 | Cars & Trucks

1 Answer

MITSUBISH LANCER ONE IGNITION COIL (BLACK/GREEN) NOT WORKING BUT SOMETIMES IT WORKS BUT AFTER STOPING THE ENGINE IT DOESNT RESTART


Evison: According to DoItYourself.com: " If your vehicle is behaving erratically and you have problems with it running smoothly, it could be showing signs of ignition coil failure. The ignition coil takes power from the generator and relays it to the spark plugs. This ignites the fuel and makes your vehicle run. The severity of the symptoms vary according to which of the ignition coils are failing.
Backfiring If your vehicle is backfiring, this can indicate early symptoms of a failing ignition coil. This occurs when unused fuel is emitted through the exhaust system. If you do not address the issue, you can also do serious damage to your exhaust, resulting in unnecessary and costly repairs. Your exhaust may emit a black smoke and you may even detect the smell of gasoline.
Starting Problems Check your high tension leads (HT Leads). These run between the distributor and spark plugs. Ignition coil failures result in one or more spark plugs not receiving the appropriate amount of charge. If you have trouble starting your vehicle in the cold, this is a good sign of potential ignition coil failure. You can run a simple test on the HT leads to check that there is in fact a spark going from each lead to each spark plug.
Fuel Economy If your vehicle is getting a lot less mileage for the gallon, This can also be a sign of ignition coil failure. When less power is reaching the spark plugs, your vehicle will struggle and use more fuel to compensate for the lack of power transfer.
Engine Misfiring Trying to start your vehicle when the ignition coils fail will result in a rough ride. Your vehicle will cough and splutter regularly and when you drive at higher speeds, your vehicle will jerk and spit. It will also vibrate when you are running idle at a stop sign or intersection.
Vehicle Stalling With ignition coil failure, your vehicle will have irregular sparks emitting to the plugs to keep it running. This will result in stalling. When you bring your vehicle to a stop, it may just shut off totally, thus leaving you needing to restart it.
Coil Failure If your spark plugs are worn out, it forces the ignition coils to operate at a much higher output. Keeping your sparks plug in optimum condition can reduce your chances of having ignition coil problems. Some simple regular maintenance will save you a lot of money in the long run.
If the gap in your spark plug widens due to normal erosion, it leads to an increased voltage being required to create a spark in the chamber. That increased voltage demands more current flow through the primary circuit and this increased current flow can overload the primary transistor. Keeping all these components in good running condition is also a big help towards keeping your coils in a good working condition."

May 25, 2015 | Mitsubishi Lancer Cars & Trucks

1 Answer

I'm having rough idle and smoke all of a sudden with my golf mk4 The oil warning lights up in dash. Oil level ok. Spark plugs not burning well. Replace spark plugs, changed oil filter, changed


Smoke is not a good sign. Running rough is not a good sign. Oil light not a good sign. You could have a combination of bad things, most likely expensive. Suggest professional help. Smoke can be bad rings or holed piston. Low oil pressure can be bad bearing or oil pump.

Nov 04, 2014 | Volkswagen Golf Cars & Trucks

1 Answer

F250 03 misfire diagnosis


The engine Family you have is know for having coils go bad. If you can get the truck scanned to see which cylinders are misfiring. If not, First I would remove all coils and spark plugs and Inspect. If you have found bad Spark plugs Replace with a high Quality plug. Double Platinum at a Minimum. I would not use Champion plugs. I have never had good luck with them in Fords. Look closely at the coil to spark plug boot. if you see any signs of arcing , White looking or burn marks that is a sign that you have boots letting Ignition spark arc to ground before reaching the spark plug. You can get replacement boots Aprox 4.00 each or there is a complete set. Look closely at the coil pack for any signs of cracking, arching, white residue, burning. that would be a sign of a bad coil pack.

Jan 19, 2012 | Ford F-250 Cars & Trucks

1 Answer

Turns but wont start at times, 12valve with FI


Distributers are very common for failing in these cars, when the car wont start, pull a spark plug out leave the wire connected and place the threaded portion of the spark plug on some metal on the engine. Get a friend to turn the key, look for spark between the gap on the spark plug, if no spark, signs point to bad distributer

Mar 22, 2011 | 1987 Honda Accord

1 Answer

I have had a small tapping noise in the engine for a while. yesterday a loud bang now its a very loud putting/banging noise. still runs but something very wrong. you can smell the odor of gasoline coming...


It sounds like you had either mild lifter lash or a plug wasn't gapped properly at first which has now gotten even worse. The gas smell that you have may be caused by a plug not firing due to misgap or a lifter that isn't functioning due to breakage. I recommend parking your vehicle as soon as possible. Have it towed to a dealer or trusted repair shop if at all possible. More use of the vehicle may cause irrepairable/ more costly damage.

Jul 13, 2009 | 2001 Ford Expedition

2 Answers

Spark plugs change


remove the spark plug lead from the plug, blow out any dirt etc from around the plug, undo the plug and remove from the vehicle, make sure the plug has the right gap setting before installing into the engine.
Check each plug that you remove for any sign of a wet or oily plug which are signs of more serious problems.
If all the plugs are dry with just a light brown carbon deposit on them they are firing ok.
Hope this helps

May 22, 2009 | 2006 Suzuki Forenza

1 Answer

Checking for blown fuse


hey, mad legend, have u checked for spark and gas yet? If not, that's the 1st thing to do. To check for spark, u can use a spark plug u took out recently when u changed the plugs. Disconnect a plug wire at plug, plug into used plug, place where u can see tip of plug easily, have someone crank engine over, u should see a good spark at plug tip. To check to see if it's getting fuel, attempt to start several times, pull a plug and check it, tip should show signs of fuel. If it's dry, no sign of fuel, u may have a fuel pump issue.

Jan 10, 2009 | 1994 Toyota Pickup

2 Answers

Oil around 1 spark plug well.


More than likely you have a leaking valve cover gastet. Not a head gasket.

Dec 09, 2008 | 1999 Volkswagen Jetta

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