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Gary, GMC Technician
Category: GM
Satisfied Customers: 16769
Experience:  15 years gm master tech/15 years ASE master tech
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2002 gmc envoy having problems its running rough smell like

Customer Question

2002 gmc envoy having problems its running rough smell like gas with muti misfire
Submitted: 1 year ago.
Category: GM
Expert:  Gary replied 1 year ago.

I am sorry your having this problem

are there any codes being set in the computer history or current ?

will it only do this at idle ?

will it run fine off idle and down the road ?

there is NO fuel or gas smell under the hood or physically at the injectors ? or fuel rail ?

Customer: replied 1 year ago.
Not sure of the code I just remember it said muti misfires.
It's running rough all the time step the gas pedal I got no power only goe to about 2000rpm.
The smell of gas its under the hood.
I put gas in and its seem to be dumping alot of gas. Went from 1/2 of gas ran for 10 min it dropped to empty
Customer: replied 1 year ago.
I was told it was egr valve stuck opened but after I reserched it 2002 gmc did away with egr valve
Expert:  Gary replied 1 year ago.

if you unplug the ECT engine coolant temp sensor will it still do this at idle ?

Customer: replied 1 year ago.
Ok I unplugged it and it did run better.plug it back in and stalled out
Expert:  Gary replied 1 year ago.

change the sensor and see if it fixes this problem