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Old 10-03-2009, 06:45 PM
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Default misfire !

Hi , yesterday i decided to have some fun with my bird but ... !! when i switched the car on I walked around after 5 mins the check engine light is falshing and the car walking same as sick dunno what is the problem , I checked if there are any air leaks but there aren't , I decided to see the plugs ! I removed 6 plugs and all plugs are black , what thats means ? and what do u think guys this problem is ?

the plugs looks like this picture


thanks in advance.
Old 10-03-2009, 07:48 PM
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Put in a new set of plugs they look fouled. Could be your o2 sensors are on their way out.
Old 10-03-2009, 08:13 PM
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Originally Posted by Nitroused383
Put in a new set of plugs they look fouled. Could be your o2 sensors are on their way out.
tomorrow i'll install a new set of plugs hopefully they will works great
Old 10-03-2009, 11:14 PM
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Read the code. Misfire is P030x. The x tells you which cylinder is misfiring (if it's just one cylinder anyway).
Old 10-05-2009, 05:27 PM
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today i installed a new set of plugs , the car runs perfectly after few minutes the car started misfiring !! , I doubt the coils causing the issue , what do u think guys ?
Old 10-05-2009, 10:40 PM
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Did you read the error code? That would narrow down the problem. It could be your wires.
Old 10-05-2009, 10:45 PM
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Originally Posted by massls1guy
Did you read the error code? That would narrow down the problem. It could be your wires.
I don't have scan tool , before few minutes when i'm checking the car i noticed the coolant temp pressure is broken .
Old 10-06-2009, 11:26 AM
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the scan tool will save you time and money by diagnosing the problem and buying the correct part. some auto parts stores will let you use theirs. without a diagnose I would take a guess at the O2 sensors.
Old 10-08-2009, 02:11 AM
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dunno what is the problem ! I changed all plugs and installed a new coolant temp sensor , I have A/F gauge the car sometimes at cruising from 1000-3000 RMP running good and sometimes rich and causing a misfire ?
Old 10-11-2009, 05:04 AM
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problem fixed , I unplugged the 02 sensors and car runs good .
Old 10-11-2009, 12:01 PM
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You PCM relies on the coolant temp output, and also relies on the O2 sensor output. It may run OK for now, but it won't last. I suggest you replace or repair them.




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