smoking high RPM knock - Ford Powerstroke Diesel Forum
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Old 11-16-2008, 08:08 PM
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smoking high RPM knock

The other day my 95 F-350 Diesel (all stock) started smoking upon startup but would eventually clear up as I drove. Yesterday the smoke continued and also came a loud knocking noise when I drove at higher rpms. The truck has almost 300k on it so I know its old, but it doesn't seem to be lacking much power. I am a uneducated on diesel workings and since the economy won't allow me to take it to a shop I hope someone here can help. Thanks
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Old 11-16-2008, 08:16 PM
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the exhaust on those are very restrictive, that could be one of your lack of power problems.
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Old 11-16-2008, 08:18 PM
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Are you letting it warm up a little after you atart it.
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Old 11-17-2008, 08:56 PM
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usually yes but this started all of a sudden.
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Old 11-20-2008, 05:50 AM
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injector

a buddy took a look at it and ran some tests and found that #5 injector was shot. He also said that when he did a compression test on the cylinder that it was full of diesel and it blew up his guage by going over 1000psi. I hope there is no internal damage. we are going to replace the injector and then see. also he said that #8 seems off a bit as well. Thanks for all your replies! The local shop wanted $940 to put in 1 new injector, wiring harness, and new gasket. WOW!
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Old 02-02-2009, 11:24 AM
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did you ever determine you knock? my truck is a 95 350 5 speed 4.10 gears dually. I have a high rpm knock above 2500. it sounds like the engine is coming out.
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Old 02-05-2009, 09:22 AM
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it sounds like a fuel delivery problem. maybe an injector.
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