05 sentra

2005 NISSAN SENTRA
100,000 MILES • 4 CYL • FWD • AUTOMATIC
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DFRANQ
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I have an 2005 sentra 1.8L with 100,000 miles. Recently, it started idleling ruff only in the morning and when its cold. The car's computer gives a PO300. I replaced the spark plugs, cam sensor, and exchanged coils on all four pistons but the car still idles bad. The car does not return a complete O2 test cycle. If it was the O2 sensor wouldnt the car specify specificlly that code. Can you please direct me in the right direction?
Dec 7, 2010 at 3:53 PM
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LEGITIMATE007
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yes it may or may not throw a code for the o2 sensor, depending on how bad it is, if its just a little "lazy" then it wont. but po300 is multiple misfire, can mean some other things too. like a leaking intake manifold gasket, a filthy air filter can do it, a bad or dirty egr valve will do it. even a bad pcv valve, check these items first. starting with the airfilter, then pcv valve
Dec 7, 2010 at 8:15 PM