2001 powerstroke knocking

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Oct 7, 2007 | 08:50 AM

#16

Kwikkordead

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From: Rio Rico, AZ.

Quote:

Originally Posted by 1996pwrstrk

I think would pull the valvecovers check all your rockerarms ,pushrods, and do a compression check before I did anything.

This will confirm.

Oct 7, 2007 | 12:11 PM

#17

Tenn01PSD350

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Joined: Feb 2006

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From: Middle Tennessee

Quote:

Originally Posted by Kwikkordead

It's too easy. The only way that blow by is generated in the crankcase is via the piston/piston rings. It's the ONLY path from the combustion chamber to the crankcase. A sudden increase in blow by can only mean one thing - a piston failure.

Yeah, the more I think about it, a lot would have to happen for a dropped valve to allow compression through the guide/seal and into the valve cover. There are two other holes that it could blow out of too. Of course this pressure would not be from combustion. I guess I need mo learnin".

Oct 7, 2007 | 08:35 PM

#18

hayfarmer550

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Im planning on checking compression hopefully tomorrow or tuesday evening after work. It starts and runs fine, no smoke out the exhaust other than the normal. It only starts knocking after about a minute and a half at idle. The longer it idles the more it knocks. I was thinking a broken ring or piston, but now that I think about it the injector could be bad. The truck has 180,000 miles. It runs good down the road and at 1,000 rpms you cant hear the knock anymore, maybe its overfueling at idle and burning it at higher rpms? It tends to smoke blue at idle and I thought it was the icp sensor out of whack. I just put stacks on it a week ago and thats when I really noticed the smoke at idle, but it has been doing it for a while. After the truck is good and warm, after driving 50 miles to work in the morning, it doesnt smoke at idle.

Oct 7, 2007 | 08:47 PM

#19

misterfisher

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Get it knocking, and turn the ignition off while coasting down a hill. If it goes away, injectors?

Oct 7, 2007 | 08:54 PM

#20

hayfarmer550

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That might work but it doesnt knock anywhere but idle. Even at 200 or 300 rpms above idle it doesnt knock.

Oct 21, 2007 | 09:19 PM

#21

hayfarmer550

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how about a head gasket blown from cylinder to oil galley? Now its pushing oil out dipstick

Oct 21, 2007 | 10:33 PM

#22

Kwikkordead

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From: Rio Rico, AZ.

Quote:

Originally Posted by hayfarmer550

how about a head gasket blown from cylinder to oil galley? Now its pushing oil out dipstick

Sorry to say, you have more blowby than the crankcase vent is designed to carry. It's overpressuring the crankcase and the pressure is finding the path of least resistance to the atmosphere.
You have lost a piston or scored the cylinder wall and excessive blowby is creating the oil spouting.
The blue smoke is from the bad cylinder, low compression, loss of oil control via a cracked piston and/or siezed rings.