How hard is it to replace injectors on a LB7?

Unfortunately, Duramax injectors are both expensive and difficult to reach in the engine compartment for replacement, which prompted GM to extend its injector warranty to 200,000 miles. The LB7 is otherwise a very reliable engine. Diagnosing bad injectors on a 6.6L Duramax LB7 engine is usually pretty easy.

What are the problems with the Duramax LB7?

One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.

What happens when a LB7 injector leaks at idle?

When an LB7 injector begins to leak, you’ll notice the truck hazing at idle and you’ll also be able to observe abnormally high injector balance rates (the amount of fuel each injector contributes to maintain a smooth idle) with the appropriate diagnostic equipment.

What causes the injector on a Duramax to fail?

The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat. The solenoid style Bosch units found in the LB7 employed a non-hardened internal ball seat to seal the injector.

Are there any problems with the Duramax engine?

The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.

How much does it cost to replace injectors on LB7?

How much does it cost to replace injectors on LB7? The total cost to have a mechanic replace 8 injectors on an LB7 Duramax can range from $4000 – $5000 CAD, depending on what other work is performed at the same time. What year Duramax has injector problems? The LB7 Duramax built from 2001 – 2004.5 is known for injector failure.

What happens when a Duramax LB7 injector fails?

Typical LB7 injector failure is dripping at the nozzle, causing white exhaust smoke, especially noticeable at idle. Another common failure is body leakage, which adds diesel fuel to the engine oil, causing the level to rise. What actually goes bad with an injector? LB7 injectors using Bosch common rail technology operate at very high pressure.

How much does it cost to replace an injector on a Duramax?

The total cost to have a mechanic replace 8 injectors on an LB7 Duramax can range from $4000 – $5000 CAD, depending on what other work is performed at the same time.

Why does my 04 LB7 engine not start?

Now engine wont start anymore. Went to start my 04 LB7 this morning to let it warm up before going to work. As I shut the door and walk away, the engine died. I tried to fire it back up but it just spins over and doesnt start. The truck has 144k, has about 3.5k on new injectors installed by dealer, fuel filter was replaced around the same time.