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Car Problems? NG900 or old 9-3 Only If you're experiencing problems with your NG900 or 9-3, post your question in here. CEL Code or GTFO!

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Old 06-07-2015, 05:04 PM   #1
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Cool cel p0300 and p0442

1st timer here goes.My 1999 9-3 turbo.I replaced fuel pump six months ago and all was fine for a couple of months then started cutting/stuttering at 65mph but not bad.All the sudden one day it starts cold rough running and not much pwr then p0442 first code.I,m looking for vac leaks etc.no luck then p0302 then next start p+303 next start p0300 random misfire.I seriously need help!
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Old 06-08-2015, 10:33 AM   #2
lms
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For the 300 errors you need to make sure you have the correct plugs, ngk copper, gapped correctly. That's a cheap fix, if this does not cure you will most likely need a DIC.
The other error is a bitch, look all over for vacuum leaks, I mean all over as this is related to evap system. Cheap fix that might work, replace gas cap. If these do not do anything, pull right rear wheel and make sure you have not rubbed through the filler neck and the other line that is next to it.
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Old 08-15-2015, 07:38 AM   #3
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Replaced dic new and same thing.when it's running the exhaust sounds muffled .If I rev to 3or4k and hold it seems less roughness and idles well but as I apply throttle it is missing for sure.112k on car.What causes po442 and misfire at the same time?I'm at pick your parts now for vaccum lines,injectors,and anything else I can find
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Old 08-15-2015, 01:50 PM   #4
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P0300 can be ignition related, fpr, maf, weak fuel pump, etc

I just had a p0300 along with running lean and a vacuum leak, it ended up being one of the hoses going to the check valve by tb broke off
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