Question about 2003 GMC Envoy

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Rough idle upon start up - 2003 GMC Envoy

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Change to supreme gas

Posted on Oct 20, 2013

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1999 cherokee starts and runs fine then idles rough and dies


If the start and run fine are on cold starts, I would look for vacuum leaks. The normal start mode for these things is to have a richer condition upon a cold start. When the ECU detects warmth in the engine is drops the extra rich cold start mode then the idle goes rough due to the normal mixture being too lean due to a vacuum leak. Look for cracked, loose or broken vacuum hoses. It could also be due to a EGR valve stuck open.

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Why does my 1989 camry 2.2 4 cylinder at initial start-up idle smooth, but upon warm-up idle rough and erratically.


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ck alt 12.5 iDle 13.5 1000 rpm
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replace cap rotor wires.ck for obd codes.Let me know

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Possible vacuum leak and or internal engine issue, have a cyl compression check done along with cyl leakage test

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95 Cutlass Ciera, idles fine in park or neutral only upon putting it in gear it (engine) starts to shake and idle extremely rough.


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Engine idles rough slightly when hot There are no stored codes upon scan,


Check and/or replace radiator cap. A bad cap can cause low coolant pressure and the engine will idle rough.

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Stumbling Idle


possibly ajusting itsself. any severe weather/pressure changes in your area? and if so does your cars cpu compensate for this (thinks its at a different elevation etc then resets its idle proper after a certian time? I have heard of this but not sure if VW uses it) perhaps ask the service tech.

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Idles rough upon start , goes dead when letting up on gas.


If the bat went dead and was disconnected it can take 25 to 50 miles of driving for computer to reset sensors and controls. Sounds like MAF Sensor maybe reading different than when it was first driven. Did you drastically change climates or altitudes, New readings from when it originally was put into service. Slight changes in temp, alt and other variables gradually reset, if driving does not improve within 50 miles it will need diagnostics.

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listen for a vaccum leak.also try disconecting bat for 5 min the reconnect and start truck and hold idle at 1500-2000 for 5 min. this resets and teaches computer to self adjust

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