08 Avalanche 5.3 misfire codes and coils plugs and wires new?

Asked by GuruJ1P6C Aug 02, 2020 at 04:20 PM about the 2008 Chevrolet Avalanche LT 4WD

Question type: Maintenance & Repair

What if it's not injector, plug, wire, coil
pack or vacuum leak....what's next
compression and remove valve
covers?

1 Answer
18,255

munron answered 3 years ago

If you're getting misfire codes its unlikely its something inside the engine that you're going to be able to see. A compression check couldn't hurt although it's most likely electronic or electrical. Going through the wiring to make sure everything is tight and making good contact is time well spent on any older vehicle.

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