1995 Chevy Camaro IDLES ROUGH RUNS RICH

Tiny
ALFREDCHEVY
  • MEMBER
  • 1995 CHEVROLET CAMARO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
THE ENGINE RUNS ON THE COOL SIDE. IT IDLES ROUGH MOST OF THE TIME BUT IT ALWAYS RUNS RICH. I HAVE CHANGED THE PLUGS AND I ALSO HAVE DONE A COMPRESSION TEST. THERE ARE NO CHECK ENG LIGHTS. IT HAS AN OBDII PORT MY SCANNER IS OBDII BUT IS FOR 96 AND UP IT WONT READ THE COMPUTER.
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Monday, January 18th, 2010 AT 8:31 AM

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Tiny
ERNEST CLARK
  • EXPERT
Your engine is OBD I, not II. Also, you could go to AutoZone or any major parts store and they'll scan the computer for free. Also, how do you know your engine is running rich?

Although possible, it's not normally the ignition that'll cause your engine to run rich. It's usually the fuel pressure regulator's diaphram has a leak and is allowing fuel to seep into the intake manifold.

That will also make your engine run rough because your computer is constantly trying to compensate for the extra fuel it's reading at the O2 sensor by shortening the injectors pulse-widths, but it's unable to.

To check your fuel pressure regulator for a leak, pull off the vacuum line that connects to the top of it and smell/look for fuel. If you see/smell ANY, then it's leaking.

If your regulator checks out, then it's possible you have a leaking/stuck open fuel injector. (But when your injectors go bad, they'll usually make the motor run a little lean)

You can also perform a cylinder drop test by pulling a plug at a time while the engine is running. If you see a noticeable drop in r.P.M.S, then you know that particular cylinder was firing. If not, then that cylinder was dead and dumping raw fuel into the exhaust.
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Wednesday, January 20th, 2010 AT 8:48 AM

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