Fuel Knock? - Ford Powerstroke Diesel Forum
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Old 01-15-2012, 09:21 AM
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Fuel Knock?

I just picked up a 2000 f250 with 7.3L powerstroke the motor has 179k miles when the motor gets up the temp it makes this knocking. It sounds like a rod bearing in a gas motor.. sounds like its coming from the rear on the drivers side. I can hear in the drivers seat really good but not so much from the passenger seat. here is a video of the sound

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Old 01-19-2012, 06:53 PM
MIG MIG is offline
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Bent pushrod mines doin it to.I had a surge of power then a clatter and it was blowing white smoke.Shut it down and restart went back to normal but now i have the same sound clakking.Im told its a bent pushrod which makes sense after the episode it was pretty violent.Bought a couple new push rods today will repl;ace tomorrow and find the ones that bent.According to another post today in this forum it does happen.Mine hapen in 3 degree weather the clattering and surge of power kinda sounded like dieseling no pun intended.I suspect my IDM because it was just replaced and it never did this before???
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Old 01-19-2012, 07:03 PM
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did some checking on it. its not a bent push rod. i pulled the Valve cover off and unplug the #8 injector the noise goes away. i have a new #8 to put in to see if it fixes it...
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Old 01-19-2012, 07:20 PM
MIG MIG is offline
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Hmm no load means no knock though? I wouldnt rule it out.
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Old 01-19-2012, 07:24 PM
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Quote:
Originally Posted by MIG View Post
Hmm no load means no knock though? I wouldnt rule it out.
under load or revving it up the noise goes away.
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Old 01-19-2012, 07:33 PM
MIG MIG is offline
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Mine does that too.Im checking it out tomorrow i will let you know what i find.
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Old 01-19-2012, 07:41 PM
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Check your wire harnesses for burnt pins or loose connections first.

It is possible that you may have a bad injector have you checked them out?

All you need to do is pull the valve cover off, start the truck, look at the top of the injector hold down the oil spout for oil comming out.

You should see each injector squirt and even ammount.

No oil = bad injector

Lower oil flow that the rest = injector going bad

Constant oil flow = bad injector

I drove a truck with a couple of injectors out and it souned like it was going to come apart.
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Old 01-25-2012, 01:20 PM
MIG MIG is offline
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Svt finally got around in checking my knocking issue.I pulled out all the pushrods on that side and all were straight so you were right .But the funny thing is i disconnected my injectors one at a time and the noise didnt change?? All of the injectors are pumping oil same amount.Its not running any different no losss of power smooth idle no fluctuation.Weird.
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Old 02-06-2012, 07:47 PM
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If it has an auto tranny then I would listen to the torque converter for noise (loose bolts) before contiuning on the engine
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Old 02-07-2012, 12:49 PM
MIG MIG is offline
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I just had mine in the shop for a ses light.And i had them check out the tapping sound that i have thats identical to SvT"s recording.They first told me that it was a bad cam or lifter.I had them take a look and inspect my valve train.After a week in the shop they concluded that the valve train was fine but now they tell me that its in the bottom end.The truck runs great no loss of power or missfire.They did find a bad connector at the ICP and replaced that and the oil press regulator.They wern't to happy about the quarter trick at the uvch the guy about flipped out when he saw that.The noise is just annoying.
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