Question about 1995 Chevrolet Silverado 2500

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I have a 1995 chevy 3500 with the 6.2 turbo in it.. When im pulling a heavy load going up hill IT will now blow heavy black smoke SO BLACK you cant stand it, and some raw fuel appears to be coming out.. the check engine light blinks on and off. then it will stop once you are up the hill but still blows black smoke when you give it acceleration on flat land. what do you think the problem is .

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Any time the check engine light is flashing the engine is missing, that is part of the resign for the black smoke and raw fuel, there is only two things that can cause this on a diesel ( other then a bad engine ) but in the fuel system it has to be a problem with the injection pump or the injectors and on the 6.2 my best guess would be the injectors, we used to replace allot of both but as you know it has been awhile sense we have seen any of the 6.2 it been awhile sense GM used them and that is because there was allot of problems with them, the most common problem we have seen lately is the pumps failing because of the new low sulfur fuel if you replace the pump the new one will be set up to handle the new fuel, but i think you have a bad fuel injector, you can test the pump housing pressure by installing a pressure gage in the test port on the side of the pump the pressure should be no more the 12 psi if it is replace the pump if the housing pressure is good replace the injectors.

Posted on Mar 21, 2011

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I have a 2005 KIA sedona. And when driving it sounds like it has a turbo. It also has no umph.instead it loses power going up hill. while the turbo sound it hesitate to shift gear.


Yours should be a 2.9 crd Turbo diesel if I'm correct & from what your describing sounds like you need to change out the diesel filter. These filters get clogged causing lack of power specially going up hill.
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Produced smoke while driving up the hill?


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Loss of power on hills


Hi, i think i answered you in another post.
If not then the likely cause of your problem is turbo related the most common cause is one of the pipes going to the turbo has a small split in it causing this problem.

Nearly all the diesel turbo cars with your problem usually means a pipe needs replacing for the turbo this will need to be checked as it can be difficult to find the damaged pipe because they work under high pressure so actually seeing the damaged part can be difficult so check properly.
If you are unsure then get a garage to check this as they will know the fault and will have a good idea exactly which pipe is damaged.
Worst case of this will be that the turbo needs replacing but this is in the most severe of cases the turbo can blow if the pipe has been damaged for to long as it will be working under the wrong pressure.
What happens is when you acelerate the turbo builds up pressure giving you more power when you need it but when the pipe becomes damaged this pressure is lossed and you then lose power and will cause black smoke coming out of exhaust.

Hope this is some help to you but if you have any problems or questions then give me a shout back and ill be glad to assist you further ok

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