knocking noise - Ford Powerstroke Diesel Forum
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  #1  
Old 12-02-2010, 12:58 AM
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knocking noise

hey everyone i own a early 99 7.3l powerstroke it has approximately 164k miles on it and I change the oil every 3 to 4K miles. I have a dp tuner (no codes tunes), a gillett diesel compressor upgraded turbo, terminator pump, hpx, triple disc torque converter, shift kit, afe stage 2, 4 inch exhaust, aem water methanol. I have the most annoying knocking noise coming from my motor. It doesn't knock when cold and only can be heard once the truck has warmed up. also I notice a little blue smoke but it only appears when i put a heavy foot down on the throttle and not on normal acceleration or idle. Can anyone help me? this is driving me up the wall. I have theories of what it could be worn injector o-rings. I had a air/contribution test and the truck passed, I did the oil cap test and it didn't blow off, there was no pooling in the intake pipe, theres no noticeable loss in power. PLEASE HELP!!!
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Old 12-02-2010, 08:37 PM
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thats not rod knock... its a diesel! j/p im curious to hear the results so im subscribing
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Old 12-03-2010, 06:15 AM
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i don't know what it is. i hope it isn't a rod knock... the truck doesn't make the knocking noise when its cold only when the truck warms up. I'm so lost. I think also might have to do with the rocker arm, valve spring, or push rod. Please Help!!
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Old 05-16-2011, 03:06 PM
mvd mvd is offline
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I have a early 99 f350 and it didn't make that noise untill i changed to a adrenaline oil pump. Sence then I checked it out and found that it only makes the noise on #8, I installed a new injector and nothing. Then took it to a diesel shop and they said I got a bad injector, but befor they took the injector out they tested compression and it only had 290 comp., they pull the injector and found yje coper washer came off on me and I foumd it on the floor but didn't know wher it went. they put another washer on it and it came back to 390 like the one next to it. problem is when I disconect #8 injector noise goes away, plug it in and it is wright back. Never was there untill I replaced HPOP, I have changed ICP,IPR, and nothing has worked, sound like a rod knock only when warmand idles ruff, It is quite and smoth runing wgen cold. seen other posts like this but no confermed fixes.
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Old 05-16-2011, 03:22 PM
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same noise here, only when warm
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Old 05-17-2011, 05:30 AM
mvd mvd is offline
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how long has yours ben doing this, i all most dont want to drive it, I fill it got to be in the injector timming.
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Old 05-17-2011, 08:37 AM
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mine does it only with my tunes, not in the stock position, so I have been driving around on stock setting until i get the chip reburnt
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Old 06-02-2011, 03:33 AM
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I had same, changed fuel filter and it went away.
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Old 06-03-2011, 11:52 AM
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Use a piece of hose connected to a small funnel to make a stethoscope, now use that stethoscope to find exactly where the knocking noise is coming from, you can tell if it is low or in the oil pan, its a rod, if a ring or piston is broken it will sound up high toward the head, or like in my truck it is in the transmission. I am curious as to what your find?

Paul
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Old 06-09-2011, 01:07 PM
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mine seems to be making a similar noise, does it cold or warm, but it goes away when i bring the rpms up to about 1300 and higher than that it is not there. and every once in a while when i get off the highway am at a stop light i can fell it miss a couple times
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