Testing the Injection Pump for 1994-2000 6.5L Diesels

Volume 2 Issue 1 - 6.2/6.5 Issues and Answers

Hello, I hope you can help us out. Our 1998 Chevy 6.5 truck has been doing some odd things lately and the shop I took it to, told me it needs a new injection pump, but I am not so sure I believe their diagnosis at least I don’t want to believe it. Here’s the issue: Sometimes when the truck is stopped at a traffic light, the engine will surge against the brake and makes a puff of gray-black smoke when this happens. I thought maybe it could be caused by a bad throttle switch. Hope this is enough for you to go on. Thanks in advance!

Here is a quick and easy way to determine whether the injection pump of any 1994-2000 6.5 C-K truck is working properly.


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