03 gmc envoy misfire problem NEED HELP

Asked by Chase03gmv Oct 01, 2017 at 01:32 PM about the 2003 GMC Envoy XL SLE 4WD

Question type: Maintenance & Repair

My 03 envoy xl has a service engine soon light on
constantly. (Flashes while I drive) I changed all the
plugs and the 1 coil pack that said it was going
out. Ive changed the fuel filter. But the car still
shakes, feels like its taking off slower. Any ideas?

5 Answers
22,660

Guru9FSV8 answered 7 years ago

Blinking engine light is not good. This is a warning that you will ruin your catalytic converter if you keep driving. Big $$$$. Have your code read and go from there

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22,660

Guru9FSV8 answered 4 years ago

How old are spark plugs? Cylinder #4 misfire. Switch coil on #4 with another cylinder and clear codes and then see if misfire moves to where you moved the coil. If so bad coil. Replace coil.

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