Question about 1991 Chevrolet Lumina

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My 92 lumina will run ok then the service engine light will come on and it will cut out and idle rough then it will straighten out ,i changed the map senser already but know i dont know what to do ,please help?

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  • 38 Answers

You Have Censer out Have it Checked.OK...

Posted on Aug 01, 2010

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I have 1995 chevy lumina with the3100 engine. It starts fine but idle is rough and has loss of power and smells like unburnt gas.


How long since overall tune-up? Any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum, something of that nature. Does it run ok off-idle?

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Smoke is not a good sign. Running rough is not a good sign. Oil light not a good sign. You could have a combination of bad things, most likely expensive. Suggest professional help. Smoke can be bad rings or holed piston. Low oil pressure can be bad bearing or oil pump.

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I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?

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Some "check engine" wraning light there? If yes, I suggest scanned the computer to know exactly what fault code is stored there. Could be a problem with fuel injection system, air intake line or other sensor refer at this systems (oxygen sensor, IAC, MAF or MAP sensors).

Keep us updated.

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Hiccuping while excelerating


Sounds like a failing MAP/MAF Sensor....manifold absolute pressure sensor or mass air flow sensor. Do you happen to have a check engine light on?

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1990 Lumina running roung, power loss rough idle


On the chevy v6 engines it real comon to have intake leaks.I would try spraing carb cleaner around the intake while the car is running and see if it changes the way it runs.If it does that is your problem.If the intake has a leak it will **** extra air in and cause a missfire.

Mar 03, 2009 | 1990 Chevrolet Lumina APV

1 Answer

Engine runs rough after about ten minutes /idles really low


Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.

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Rough running and rough idle


here is a diagram of the map sensor #5.

2009-10-07_190044_3.gif

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