Question about 1995 Chevrolet Cavalier

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1995 chevy caviler hard to start, and running poorly.

Sometimes when you start the car the check engine light is on, the cooling fan runs constantly, idles at about 1000 rpms and misses and the mixture smells rich. the other times you start it the check engine light will be off, the fan will not run, it idles at 600 rpms and still misses, and either way it runs it trys to die. i read in a chiltons manual that the ecm controls mixture, idle, and the coolent fan. it also mentioned a back up mode for the ecm but did not explain what the back up mode was, how to tell it was in back up mode, what the back up mode would cause, or if something was wrong with the ecm. i also dont know if the ecm is whats causing the problem. anything you can tell me will be appreciated. oh and how to get the ecm out of back up mode if that is what is causing the problem.

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  • bluerose3272 Apr 16, 2009

    No that is not what happened the cooling fan only stays on when the car started the check engine light is on and the check engine light is not always on. the cooling fan only come on when the check engine light is on, and the car idles about 1000 rpms but still runs rough

  • bluerose3272 Apr 20, 2009

    This message is for carhob.I tried scanning the PCM on my 95 cavalier like you said. All the scanner will say is "LINK ERROR" try again? I must have tried atleast 30 times and it would not access the PCM. I also have a 96 cavalier. I used the scanner on it and it worked fine. I know they started switching from the OBD-1 to the OBD-2 system in 94 and 95 so on the chance it was an OBD-1 system I went and bought the OBD-1 scanner. It wont fit. So the system on the 95 is supposed to definately be an OBD-2 but the scanner would not access the PCM. Please help. I'm stuck.

  • carhob May 11, 2010

    did u scan ecm for the trouble code thats been popping up,before assuming this and that!

  • mary allman May 11, 2010

    has some one wired cooing fan to stay on all the time.

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  • Chevrolet Master
  • 11,086 Answers

The first step would be to take it an have a diagnostic scan tool hooked up , Don't worry about back up modes . From the sound of it you know very little about ODB 2 an computer control emissions . Your not going to learn anything from a chiltons manual ! Your best bet , take it to a qualified repair shop . I have over thrity years in the automotive repair business an i can tell by your post that you will never be able to repair this , so do yourself a favor an take it to a professional

Posted on Mar 18, 2017

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Gas mixture

I don't know what year you are working with, but I have an 87 that was doing the same thing. I converted the air filter to a K&N system and did away with the old filter box. The problem did not go away. I talked to a Toyota specialist and he told me in the top of the mass flow sensor there is a plug that you need to drill out. There is an adjustment screw that regulates the air mixture with the gas. It is located on top of the mass air flow sensor that connects to your air filter box.

Posted on Aug 28, 2009

  • 1201 Answers

SOURCE: Burning smell,check engine light-misfire, rough idle 96 cavalier

Sounds like there is a blown piston, to be sure have a compression test done on that #2 cylinder, if the reading is low, then you'll know.
A friend of mine had a 95 that did simular things only a little more,
it started smoking, dash lights flickered, etc. Finally, he had to get rid of it, the piston rod went through the engine block.

Posted on Feb 02, 2010

  • 691 Answers

SOURCE: comon egr issues

get your lamda sensor checked (exhaust/cat) and also make sure your air intake system does not have leaks after the air flow meter

Posted on Nov 29, 2011

johntunney
  • 887 Answers

SOURCE: i have a 1990 chevy k1500, running rough at idle and exhaust stin

it is a vacume leak. check lines for cracks or if they fell off. if not this check map sensor and maf sensor

Posted on Mar 11, 2013

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