Engine knock, vibrates on acceleration, rough idle - Ford Powerstroke Diesel Forum
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Old 06-25-2012, 08:18 PM
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Engine knock, vibrates on acceleration, rough idle

I have a 2000 F250 7.3 . I had an engine knock that seemed to come from the water pump. Now the knock has gone away. It still idles rough and vibrates on acceleration. Could it be a clutch fan? Harmonic balancer? There is no service engine light on. Started right after I filled it with fuel this tank.
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Old 06-25-2012, 08:25 PM
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Could be a bunch of stuff dude. My guess would a miss which again can be caused by a few things. How handy and knowledgeable are you? I would start with a thorough exam of your UVCH and associated wiring. Need this explained?
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Old 06-26-2012, 12:38 AM
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X2
Sounds like a miss fire. Could be quite a few things.
any smoke?
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Old 06-26-2012, 03:50 PM
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I just did the under valve cover fix. There is no check engine light. I have a Superchip 1805 programmer that I can pull codes with. It's the knock that comes and goes that worries me. With a stethoscope it comes from the water pump.No smoke.

Last edited by WackerCattle; 06-26-2012 at 05:19 PM.
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Old 06-26-2012, 06:00 PM
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I don't know of any reason a water pump would knock but maybe the knock is just in the front of the engine. (I am thinking this is what you meant)

A faulty injector can cause a knocking sound in the engine also and create the shaking.

If you can't do a contribution test then I would have someone else do it for you and see if there is an injector problem.
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Old 06-26-2012, 08:00 PM
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Is that a "buzz" test? I have a buddy that can do that, may have to borrow his machine. I was thinking there was no reason for a water pump to knock, but Powerstrokes are in their own little world. The fact that it "went away" made me wonder. Thanks!
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Old 06-26-2012, 08:07 PM
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A buzz test is different but usually along with a contribution test.

If it can run a buzz test i think it can also do the contr. test

The buzz test just sends a signal to each injector to pulse and you have to listen to the sound or lack of.

The contr test, through the pcm, cuts one cyl at a time and calculates how much ot is contributing to the engine. This tests the overall condition of each cyl like rings, valves, injector, cam lobes, head gaskets.

Both are just a start but can highlight an area that you may want to concetrate on.
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Old 06-26-2012, 08:33 PM
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Cool, I'll have to do that. Thanks!
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Old 06-26-2012, 08:38 PM
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No prob
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Old 06-27-2012, 04:05 AM
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What do you mean by "UVCH fix"? I would still inspect it.

Agreed with running the buzz test and contribution test.

If you just had work done to your UVCH it is possible that an injector isn't plugged in properly or one of the other plugs has separated or something along those lines.

Oh and of course the obvious (to me) question...did you try a new CPS? That is the FIRST thing I do to any 7.3 I deal with that has ANY kind of issue unless it's blatantly obvious. Those stupid CPS can be responsible for every symptom possible.
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