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Spark plugs are carboned up after little mileage
Posted: Thu Oct 25, 2007 9:17 pm
by ericem
Hi I want your opinion on what is wrong. I have replaced the plugs 3 times in 15,000km and they always come out looking the same way with a lot of carbon on the plug. Tried NGK g and v powers with same result.
Posted: Thu Oct 25, 2007 10:05 pm
by 555BCTurbo
Either your car is running rich, has low compression, or has oil control problems...
Posted: Fri Oct 26, 2007 12:28 am
by ericem
Ok car doesn't burn oil and vacuum gauge is showing 21 which is good so compression and timing belt is good. Car definitely does seem to be running rich. I replaced the ECU temp sensor, knock sensor. Only things left to replace I guess is MAF sensor and oxygen sensor.
Posted: Sat Oct 27, 2007 2:09 am
by quicklook
is air filter clogged?
Posted: Sat Oct 27, 2007 3:26 am
by ericem
Just replaced it.
Posted: Mon Oct 29, 2007 8:45 pm
by BXSS
Carbon on the plugs = "overfueling" - its rich.
The rich condition may be caused by MAF, coolant temp, O2 sensor, high fuel pressure... - the fuel injected is just too much fuel to burn.
A less likely cause for this may be a weak ignition system - where the correct amount of fuel goes into the c-chamber, but the spark produced is not strong enough to burn it properly.