GM / Chevrolet / GMC 6.6L Duramax
Duramax injector replacement
Injector testing and replacement — including the LB7's well-known injector failures.
Why this matters on the 6.6L Duramax
The 2001–2004 LB7 is known for injector body cracks and fuel-in-oil. Later generations have different, usually lower, injector failure rates.
Symptoms owners notice
- Smoke
- Rising oil level
- Rough idle
What we check
- Balance rates
- Return flow
- Oil analysis
Repair work involved
- Injector replacement
Trucks with the 6.6L Duramax
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