Question about 1997 Chevrolet Lumina

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1997 Chevy Lumina running rough and dying when idling. Changed spark plug wires, spark plugs, fuel filter, and oxygen sensor. After completing tune up car ran rougher than before and gasoline flowed out of the exhaust pipe. Can you suggest how to correct?

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Bad injector

Posted on Oct 07, 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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My 95 Windstar idles very roughly. It starts just fine but after about 4 to 5 minutes it starts idling roughly. I put a new air filter in but that didn't do anything.


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Oxygen sensor only report the condition of the engine the rough running condition can range from a worn sparkplug wires to worn sparkplugs to valve problems to injector problems. with the cadillac deville a tune up should be the first attempt to smooth the rough idle with the inspection of the cap and rotor cap and rotor do have a tendancy to arc internally and create misfire so does sparkplug wire that can leak spark voltage to ground and create misfire. the spark plug wire especially if they are brittle and hard can create issues

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Self-adjusting idle brain often idles 1500-2000rpm range.


Faulty oxygen sensor or low fuel pressure can also cause these codes to be set. I'd go for a fuel pressure test when acting up if at all possible just to confirm I have pressure needed. Have heard of coil problems as well. Should be a good blue 1" min. spark from coil.

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