G35 Sedan V35 2003-06 Discussion about the 1st Generation V35 G35 Sedan

Help, codes p0021 p0300

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Old 02-04-2017, 05:11 PM
Isaac Vazquez's Avatar
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Help, codes p0021 p0300

Changed out my valve cover gaskets a few days ago. Everything was running fine then out of the nowhere these codes came up. Car starts up fine but after it warms up it idles rough.

Changed out the cam position sensor bank 2, also did oil change,oil filter, coil change, still need spark plugs(ngk iridum remain)
 
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Old 02-05-2017, 09:08 PM
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I've been having the same problem with my g. I just ordered coil packs just because the car hit 100k but I also cleaned my maf sensor and still not working well. Does yours not shake when it's a cold start but start shaking once it warms up?
 
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Old 02-06-2017, 12:55 AM
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I'd say check for a vacuum leak. Easy to happen when putting back the plenum after all that. Checking for the oil filler neck not stuck under the plenum etc
 



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