GM 4.8L V8
4.8L misfire diagnosis
Ignition and intake-related misfires on the 4.8L.
Why this matters on the GM 4.8L V8
Without cylinder deactivation, 4.8L misfires are usually ignition, intake gasket or injector related.
Symptoms owners notice
- Rough idle
- Check engine light
What we check
- Coil and wire tests
- Smoke test for vacuum leaks
Repair work involved
- Ignition and intake gasket repairs