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97 Cavalier, rough idle, hesitation

Tiny
SOONER
  • MEMBER
  • 1997 CHEVROLET CAVALIER
I recently replaced the injectors on my 97 cavalier with 2.2 and was having issues with it hesitating and rough idle. I replaced the O2 sensor and it ran great for a couple days and today my check engine light came on. When the codes were read I had P0172 (running rich) & P0300 (misfire). Any ideas on what to check to help fix the problem?
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Friday, February 24th, 2006 AT 9:59 PM

2 Replies

Tiny
MVANNESSJR
  • MECHANIC
  • 223 POSTS
Check spark plugs. These codes can go hand in hand. In your case, the plug isn't firing and the fuel is not being burned. A plug may be worn or it is not seated properly.
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Saturday, February 25th, 2006 AT 4:08 AM
Tiny
SOONER
  • MEMBER
  • 2 POSTS
I checked the plugs and they all looked pretty bad. Just by looking at them you can tell the car is running rich. I replaced them less then a month ago and also had them out earlier this week and they looked great, but since the new O2 sensor was installed they don't. I did go ahead and replace the spark plug wires since they were due. The whole problem began once I replaced the injectors, it ran fine up to that point except for gas smell caused by the injectors.

I checked for vaccum leaks and didn't find any, not sure where to go from here. Could it be the IACV or MAP sensor?
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Saturday, February 25th, 2006 AT 2:32 PM

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