Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

6.5L - lots of black smoke during acceleration

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Old 09-23-2018, 09:10 PM
Tahoe2DR's Avatar
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Default 6.5L - lots of black smoke during acceleration

HI,
I have a 1999 6.5L with about 300K miles that puts out a lot of black smoke when I accelerate. I think it's something with the wastegate or EGR but looking for help to diagnose.

I got code P0236 (Turbocharger Boost Sensor A Circuit Range/Performance.) I replaced the Wastegate solenoid and cleaned the inside of EGR valve as best I could and the codes went away, but not the black smoke. I get the correct vacuum from the pump (the needle is steady at 25 in-Hg) and about 14/15 in the wastegate line, the needle fluctuates. Should it fluctuate? With the solenoid removed, should I be able to blow through it?

The wastegate actuator arm moves when the engine is off and is pulled up when the engine is idling. Is there more I can check? Is it possible to take the wastegate apart?

Previous Issues/History:
-When I bought the truck, it showed code P1653, would idle fine but rev up to redline if I tapped the gas pedal. I replaced the PMD and the run-away RPMs went away after 10 or 20 restarts.
-The injector pump was replaced by a previous owner. (I have the old pump if anyone wants it) Could the issue be injector timing?
-Could black smoke be leaking injectors?

Thanks for reading.
 
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Old 02-10-2019, 08:47 AM
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when the engine is idling safely attempt to pull the wastegate open against the force of the diaphragm,if you can easily overcome the actuator it is most likely faulty-it should take a good amount of effort against a finger or 2.
 

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