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2007 gmc t 7500 with Isuzu motor. heavy black smoke from…

2007 gmc t 7500 with...
2007 gmc t 7500 with Isuzu motor. heavy black smoke from exhaust when accelerate. worse under load, after a few seconds it begins to clear up but still light amount of black smoke. comes back wen ever you try to accelerate. checked turbo seems clear and clean checked charge air pipes all clear up to intake. performed complete pm service but no change. old oil looked ok. no check engine light. has 130k on engine.
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Answered in 17 minutes by:
10/18/2017
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,218
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified

Hi I'm Wayne

I will help you with this

this is a common issue on the Isuzu engine

The injectors failed and over fueling

sorry to say, but they need to be replaced

I hope this helps you

Hi. If this helped you

Please rate my.

That is the only way I get credit for the question

or the money you paid stays at JA and I get nothing for my time.

If you need more info use the REPLY button

Not the Poor/Bad service.

Wayne

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Customer reply replied 9 months ago
ok very expensive but perhaps correct diag. I was looking for further diagnostics to be sure. any other things you can think of before I invest a few grand into injectors? just to rule out some simpler things like a map sensor? black smoke is due to too much fuel as compared to the air volume. im with you on the injectors but sure would like to rule out simpler less costly things first

Hi

I have worked with you several times in the past

always with good results

other the a blocked air intake, no

Wayne

Hi. If this helped you

Please rate my.

That is the only way I get credit for the question

or the money you paid stays at JA and I get nothing for my time.

If you need more info use the REPLY button

Not the Poor/Bad service.

Wayne

Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,218
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified
Wayne and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Customer reply replied 9 months ago
good enough for me ill keep you posted
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Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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