"Service Engine Soon" and fault code - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 07-31-2009, 09:54 PM Thread Starter
 
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"Service Engine Soon" and fault code

2001 GMC 3500 with 82K miles; runs perfectly with NO change to anything that I can see, hear, or feel....except that last week it threw that light. Local service dealer said it indicated "misfire on 4". He reset it and it stayed off for about 5 days of normal 40 mile per day driving. It just appeared again this afternoon.

Could this injector just be dirty?

Can one injector go bad and nothing be noticeable?


What if I just put some duct tape over that light?

--Bryant
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post #2 of 7 (permalink) Old 07-31-2009, 10:02 PM
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The injector could be dirty, but most likely needs to be replaced. Sorry to be the bearer of bad news, but the LB7 is hit or miss with the injectors. Try some power service injector cleaner, but I would bet it wont work.

Pull the dipstick and give the oil a sniff, does it smell like diesel?

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post #3 of 7 (permalink) Old 07-31-2009, 10:56 PM Thread Starter
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Merlin, thank you for your prompt reply.

No, Sir...my engine oil has about 4200K on it and there is no diesel smell whatsoever.

Merlin....after reset, if the injector is bad, wouldn't it have thrown that service engine light prior to 200+ miles down the road?

What about something shorting out? A wire laying worn through...?? I dunno. Just trying to sort out all before the injector is conceded to.
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post #4 of 7 (permalink) Old 07-31-2009, 11:53 PM
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The computer needs to "read" a problem a certain number of times before it triggers the check engine light. 200 miles is not out of the question.

It could be a chaffed wire or a bad ground, without being able to see the truck, I can only guess. You should be made aware though that the LB7 is known for injector problems. It might be something else, and maybe someone else can chime in with another way to check, but from the info you've given, I believe you have a bad injector.

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post #5 of 7 (permalink) Old 08-01-2009, 12:07 PM Thread Starter
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Thanks again, Robert. I can fly the hair off of a $19million Army helicopter but I truly know very little about diesels, much less the Duramax. If you've time, I'd appreciate your thoughts on my questions below:

Is this an issue that should be checked out by a GMC dealership service dept?

Why is there no other "noticeable" in how my truck runs?

As there is no noticeable difference to me, am I hurting the truck by running it?

If it is the injectors, do I change all of them? Just that one? Just one bank/side?

And....should the injectors be replaced with factory or do you recommend and "upgrade"?

Thanks, Robert.

--Bryant
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post #6 of 7 (permalink) Old 08-01-2009, 03:53 PM
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Originally Posted by ArmyAviator View Post
Thanks again, Robert. I can fly the hair off of a $19million Army helicopter but I truly know very little about diesels, much less the Duramax. If you've time, I'd appreciate your thoughts on my questions below:

Is this an issue that should be checked out by a GMC dealership service dept?

Why is there no other "noticeable" in how my truck runs?

As there is no noticeable difference to me, am I hurting the truck by running it?

If it is the injectors, do I change all of them? Just that one? Just one bank/side?

And....should the injectors be replaced with factory or do you recommend and "upgrade"?

Thanks, Robert.

--Bryant
Like I said before, I can only guess based on the info you've given. Your best bet is to have a dealer or local repair check it out.

As far as changes, it may be that the injector is leaking just enough to trip the light, but not enough to make a difference. Diesel by design idle and run rougher then gas engines, so you may just not notice it. I personally would not drive the truck until the problem is solved.

Good luck.

-Robert.

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post #7 of 7 (permalink) Old 08-01-2009, 04:17 PM
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Bryant it sounds like you have an injector harness wire shorting or a bad connection. It needs to trip a couple of times but that happens in less than a second honestly. So we'll say it takes a couple of cycles of driving, instead of revolutions to get the CEL/SES on. It could be as simple as being a bit dirty.

Check the injector harness where it's zip-tied to the alternator bracket. Unless it's already been done, you should cut the zip-tie, repair any worn wires, then tape and insulate with a short piece of split heater hose, then zip-tie back in place. I know this applies to the LLY but IIRC it also applies to the LB7.

Buy a silver bottle of Power Service Diesel Kleen - dump the entire bottle into your tank. Later, on the next tank... just put in 8 oz per tank. This stuff is nearly miraculous - has been known to revive marginal injectors, restore balance rates, and generally smooth out many a rough running engine. $7 well spent.

LB7s do eat injectors. They run around $400/injector.

There is a harness issue with the LLY but I don't remember it showing on LB7s. I never had issues with my LLY that I didn't cause.

There is a lot of info out there on the LB7. The Duramax side here is really getting back up but we're still working on it. I don't want to plagiarize the heck out of stuff or lead you to other forums.

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Last edited by BombDocDiesel; 08-01-2009 at 04:27 PM.
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