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Old 07-07-2006, 10:04 PM   #1 (permalink)
ussie1
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duramax knocking

well went for a ride yesterday in my 05 duramax and all is well until about 30 miles into the ride and noticed that the oil pressure was slowly dropping. Not thicnking nothing of it keep going and all of a sudden start to hear this knocking noise. Pull over and it sounds like it has a rod knock on the drivers side. Oil pressure was only at about 30 going down the road at 60. Got it hauled back today and started it up and it was quite and the oil pressure was back up. Started the knocking noise when you give it gas. No check engine lights. All stock very wierd. Almost sounds like a rocker arm is off. Need help. THanks
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Old 07-07-2006, 10:38 PM   #2 (permalink)
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any smoke?
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Old 07-07-2006, 10:55 PM   #3 (permalink)
ussie1
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no
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Old 07-07-2006, 11:02 PM   #4 (permalink)
sideswiper
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mines knocking too.hurry up and tear yours down so ill know whats wrong with mine.lol
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Old 07-08-2006, 12:16 AM   #5 (permalink)
aznap
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ussie1,

Not to be the bearer of bad news and I certainly hope this is not your issue but I had the same knocking noise and oil pressure drop happen to my truck back in February. At idle the motor was quiet but as soon as you throttle he up you would hear this awful knocking. The long and short of it as it turned out was the #8 wrist pin cracked and the piston was hitting the head. After 59 days at the dealer GM replaced my motor with a nice new one. This happend with only 22,000 miles on the clock.

As a side story, I had the EGR blocker plate in my truck and I totally forgot about it being in there. When the service department started tearing the motor down in the first stages of diagnosis they stopped work on the truck, stated there would be no warranty coverage and that I would be responsible fiscally for any further work. After several calls to the 800 customer service number and several tense/terse words with the GM area repesentative, GM decided to honor the warranty. My VIN is now tagged!
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Old 07-09-2006, 11:51 AM   #6 (permalink)
ussie1
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I had a mechanic look at it when i got it back and said it doesnt sound like a rod knock. He said it sounds like it is up higher in the motor. What does a bad injector sound like never had one go? Thats what he was thinking after a quick opservation.
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Old 07-09-2006, 12:03 PM   #7 (permalink)
ussie1
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I forgot to mention that it has a miss to it at 1200 to 2000 rpm also thanks.
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Old 07-10-2006, 11:27 AM   #8 (permalink)
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In my experience most people will identify a lifter type of knocking sound when an injector is failing vs. a rod knock. If you can get your balance rates checked that will aid in identifying an injector issue.
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Old 07-10-2006, 11:27 PM   #9 (permalink)
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Quote:
Originally Posted by Enigma View Post
In my experience most people will identify a lifter type of knocking sound when an injector is failing vs. a rod knock. If you can get your balance rates checked that will aid in identifying an injector issue.
YUP! And lower oil pressure in the summer is normal unless your running a EOC.
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