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1996 Chevy Monte Carlo Misfire/Lean

Tiny
CVWINTON
  • MEMBER
  • 1996 CHEVROLET MONTE CARLO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 220,000 MILES
After I have driven my car and it has been completely warmed to operating temp. I turn it off and let it set for 20-30 min. And upon startup I will get a P0171 system too lean bank 1 and a P0300 random multiple cylinder misfire detected and engine runs very rough if it will even stay running. This was a intermittent problem at first and now is repeatible almost every time. Car runs great when started cold and will run fine as long as above process isn't repeated. Get's great mileage 27-31 mpg plugs, wires, coils all been replaced recently. EGR and IAC both check ok no vaccuum leaks present power and compression both good. Had diagnosis done by GM dealer with no help. Any suggestions will be appreciated.
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Wednesday, March 12th, 2008 AT 9:11 PM

2 Replies

Tiny
RATTLESHARK
  • MEMBER
  • 3 POSTS
I have the same problem. Same car. Etc. Checked everything I have read on. If you find out the answer. Plz let me know.
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Sunday, May 4th, 2008 AT 9:00 PM
Tiny
CVWINTON
  • MEMBER
  • 2 POSTS
Check your fuel pressure, as strange as it sounds this was my problem. The low pressure was causing a lean condition, I think there may have been a vapor lock occuring after shutoff due to the low fuel pressure
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Monday, May 5th, 2008 AT 9:21 PM

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