The LB7 Duramax is a 32-valve V8 diesel engine produced from 2001-2004.

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Repairing the injectors - clean or replace

Motor has 250,000 + miles and is emitting smoke at idle. Is there a way to clean the injectors or do they need to be replaced?

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mayer, I've never had much luck with cleaning injectors. I would suggest to either rebuild or replace. Rebuild kits are available at places like this. They also have a decent video on here.

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Thanks, I'll forward this to my son.

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I had a similar issue with my 2002 Duramax. Smoke on idle, little bit of a puff upon acceleration and then no problems when cruising along.

I solved my problem by:

1) Running the engine to operating temperature.

2) Removing the fuel filter and putting in a new one.

3) Filling the reservoir with "Sea Foam" (a cleaner you can buy at any auto parts shop)

4) Re-installing the fuel filter housing.

5) Idle the engine for 3 minutes.

6) Let it sit for 20 minutes.

7) Run for 3 minutes.

8) Let it sit for 20 minutes.

9) Run the truck hard (up hills / tow a trailer) for 20 minutes.

This Sea Foam was able to hot soak my injectors twice and broke up whatever was clogging one (or more) of my injectors.

Cost:

$10 for Sea Foam

$35 for new diesel filter.

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mayer will be eternally grateful.
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