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Fouled spark plugs are when they aren't firing, causing a cylinder misfire. Can be caused by a burnt electrode inside the plug from being old OR too much carbon or oil on the tip between the electrodes where the plug fires.
Hi Aadil:
The spark plug that is misfiring should tell the story. Is it oil fouled? Bad rings or valve seal. Is it carbon fouled? Electrodes fried? Wet looking? Maybe a bad plug wire and it's not firing properly?
What kind of engine?
See if you can isolate the problem and we'll try to be more specific with help.
DETERMIN IF YOUR PROBLEM IS ONE OF THE FOLLOWING BEFORE CHANGING ANYTHING .1.ELECTRICAL 2.FUEL RELATED OR 3. MECHANICAL.
PERORM A COMPRESSION CHECK TO ENSURE THE COMPRESSION IS GOOD .IF THE COMPRESSION IS IN ALL CYLINDERS PROCEED TO CHECK FUEL SYSTEM .REMOVE THE FUEL INJECTORS AND EXAMIN THE INJECTOR TIP FOR CARBON DEPSITS .CHECH FUEL SPRAY PATTERN ,ENSURE INJECTORS ARE ACTUALLY SPRAYING . THEN PROCEED TO EXAMIN THA SPARK PLUGS .LOOK FOR DISCOLOURATION OF SPARK PLUG ELECTRODES OR CARBON DEPOSITS. IN DIAGNOSING PROBLEMS ONE HAS TO SYSTEMATIC OR ELSE YOU WOULD BE WASTING MONEY AND TIME PURCHASING AND REPLACING COMPONENTS WHICH ARE NOT DEFECTIVE . GOOD LUCK .
I have the same problem with my 2003 nissan sentra gxe. I don't know about under the hood, but I was told that the gas filter needed to be changed. Something's wrong with the gas intake to the engine. I had it "fixed" but it still does it a little bit everytime.
I had that exact problem on my 03 sentra gxe 1.8L , turned out to be the alternator had died and it was trying to use the battery. Are you having any electrical problems? Because when this was going on with me, the lights would barely work inside and outside the car - new alternator and battery and its been fine ever since
is the engine turning very fast and making an uncommon noise . if it is then you more than likely have a broken timing belt . if this is not the case then you need to check for spark .
Look for air leak either at the MAF sensoor near the carbon canister It cannot give correct reading when there is an air leak
Check emmisions
Regards nik (Slowmeup)
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