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1992 Chevy Corsica running rough

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New User

May 12, 2013, 11:51 AM

Post #1 of 2 (1321 views)
1992 Chevy Corsica running rough Sign In

Corsica LT
3.1L V6
157,000 miles

Hi! So, I've had this corsica for a little while now and a few weeks ago, it started running a little rough while I was driving to a show. It got worse throughout the drive back, and then once I was eventually home, I could hardly even get the thing to start. I had a mechanic look at it and he told me it was the spark plugs or the coil packs, since it sounded like the car was misfiring. Well, I changed the plugs and wires and even got the new coil packs on and it is running somewhat better, but there is still a ton of exhaust coming out, and it's running extremely rough. I can get it to start, but I can't get it to continue running, especially when it's not in park. We checked all the fluids and it looks like when I had Walmart do the oil change like 2 months ago, they must have put wayyy too much in because it was 2 quarts over. We drained some of the excess oil out but it's still running extremely rough. I hope my car isn't done for because of this! Can anyone help me out with this?

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 12, 2013, 12:39 PM

Post #2 of 2 (1302 views)
Re: 1992 Chevy Corsica running rough Sign In

Arggh! Two quarts over is pushing it but it tolerated that without you complaining till a few weeks ago. IMO a 21 year old you should be checking oil a lot and should have noticed but it shouldn't have happened either. Smell your oil now if just changed. Does it smell like gas?

So many possible things but some you can check. Vacuum hoses everywhere, throttle body cleaned for a beginning. Any vacuum leaks.

You can't let this run rough with lousy smelling exhaust for long or you'll add a converter you your bucket list that probably isn't the cause of this from the get go.

You really need to look at plugs when you take them out and see if they are uniform. Note one or more that aren't.

You can get OBDI codes on this but most places that do it for a courtesy will baulk at an OBDI system and doubt any recorded if CEL isn't staying lit and really should be the way it runs. Note if bulb works when starting that should light as a bulb check.

Check your own fluids too. Specifically engine coolant at the radiator and recovery tank too. Check oil again. Is it where you left it?


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