Question about 2003 GMC Envoy

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Abnormal idle I already did change the fuel cap, but still causes me the same problem. Thanks for helping, i really appreciate it.

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Try checking for vacume leaks and have u had a tune up lately

Posted on Jun 27, 2008

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P0442 I got the check engine light in my GMC savana 2008 I get this code P0442 it said. a small leak in detected can someone please help me with this problem I reset the code 2 times already the first time...

The P0442 code is for a small leak in the pressurized emission system. It can be caused from something as simple as not tightening the fuel cap all of the way after fueling, or a leaky seal at the gas cap, or a leaky o-ring around a number of sensors and fittings in the emission system. If you are sure that you are tightening the fuel cap all of the way, and have already replaced the fuel cap and see no nicks on the seal on the fuel cap or fuel neck, you might need to have the vehicle hooked up to a smoke machine to try and find where the leak is coming from.

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Hard Starts, Rough Idle

Certainly possible.Key on /engine off cycles the pump for 3 secs.In a quiet place like an enclosed garage you can hear these pumps running and at this stage it might sound abnormal, louder and squeel-ish in a sense.Then can be verified by taking fuel pressure readings with a test gauge...good luck

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thanks for the advise but i found the solutions already,the whole map sensor set,the one with three wires(not the throttle sensor)maybe they call that as the air sensor,is the one causing the problem,it is shorted w/c make one of the transistor driver of this thing can get burn easily,even if i replaces a new one.Now my car is healthy again,thanks and more power.....

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1 Answer

Abnormal idle

cahnge ur fuel cap it pressurezes the fuel system when the cap fails it can cause this

Jun 25, 2008 | 2003 GMC Envoy

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