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1994 Chevy C3500hd rollback 6.5 turbo diesel
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Discussion Starter #1 (Edited)
I have a 1994 Chevy C3500HD 6.5 turbo 5 speed roll back tow truck with about 130,000 miles on it.
My question is why would it all the sudden start to blow some black smoke while shifting especially with a load on it
will also do it sitting still if i stomp on fuel pedal. Seems to have also lost a little bit of power taking off also up a incline. You can hear the turbo spool up while shifting only smokes while shifting and when you stomp pedal while sitting still. Drives fine on the highway and while cruising down the road .
Has brand new air filter
I have checked the wastegate actuator linkage while running and you can not move it at all. also checked the vacuum at waste gate and at pump. I put vacuum gauge on orange line at waste gate and got 25 in-HG i also checked line coming from waste gate actuator and got 15 in-HG.
Replaced the wastegate solenoid just in case and checked vacuum and got same readings.
I have also changed the turbo boost sensor. The exhaust is straight piped
Any help would be great im a small business owner with a new business i cant afford to keep throwing parts at this if it not going to fix the problem

Will it harm the engine to keep driving it like this???
 

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Check your exhaust system pre-turbo including crossover for any leaks
 

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Are you using an aftermarket air intake?
Changed you air filter recently?
 

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All stock
I've replaced air filter few days ago
With a Napa gold part #6316
Try removing the air intake from the fender mount and inspect/remove the snorkel tube located inside of the fender ( if equipped).
That plastic snorkel is restrictive.
 

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1994 Chevy C3500hd rollback 6.5 turbo diesel
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14 Posts
Discussion Starter #7
Try removing the air intake from the fender mount and inspect/remove the snorkel tube located inside of the fender ( if equipped).
That plastic snorkel is restrictive.
ok i will i have also test drove it with no air cleaner and left box open thinking it was not getting enough air didn't change anything other then i could hear turbo spooling up better
 

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From the pic it appears to be normal. There are no contact markings on the housing from the impeller.
The little bit of oil you see is from the neglected CDR valve on your passenger side valve cover. Replace it and you'll be good.
 

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1995 GMC Suburban
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Try to wiggle it.

Check based on suggestion in post #6.
That is basically, on the fender.
Check this pictures:
 

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1994 Chevy C3500hd rollback 6.5 turbo diesel
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Discussion Starter #11
I think the black smoke issue is solved.
I just put put on a new PMD relocation kit and did a couple of tows drove 200+ miles round trip.
So far so good keep your fingers crossed lol

The relocation kit i put on is a Dorman from Pensacola Fuel Injection has anybody else used them ?
 

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I think the black smoke issue is solved.
I just put put on a new PMD relocation kit and did a couple of tows drove 200+ miles round trip.
So far so good keep your fingers crossed lol

The relocation kit i put on is a Dorman from Pensacola Fuel Injection has anybody else used them ?
Pensacola is not a very good business. Many here have complained about their parts & services.
You can do a BBB review and see some of the other customer complaints:
 
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