Does this sound like rod knock? Please help.

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09-28-2009, 08:44 PM
GasGuzzler

That would only affect power and spark knock under load.
09-28-2009, 09:12 PM
midevil1

wrist pin knock will go away as RPM's go up. Piston slap is actually an option is a GM vehicle. The more you pay for one the more you will get.....:argg:
09-29-2009, 09:20 PM
Southern Pride

If it is a wrist pin, I shouldn't need a complete rebuild correct? Where are the wrist pins located?
09-29-2009, 10:43 PM
GasGuzzler

At the top of the connecting rods, they hold the pistons on.
10-01-2009, 10:39 PM
Southern Pride

Guys, it couldnt be from a bad steering pump could it? Mines bad and when the power sttering fluid levels low it knocks harder it seems filled it back up today and its not as bad??? any thoughts?
12-08-2009, 06:40 PM
johanh13

Hello,

I have a knocking sound in my engine as well, it is a 2003 GMC Yukon with the 5.3 liter engine. HOWEVER, it only knocks for a short while when it is cold. What could be the problem? Could it be a valve lifter?

THANKS in advance, you guys are great!
12-08-2009, 07:20 PM
trx2stroke4life39

Quote:

Originally Posted by johanh13

Hello,

I have a knocking sound in my engine as well, it is a 2003 GMC Yukon with the 5.3 liter engine. HOWEVER, it only knocks for a short while when it is cold. What could be the problem? Could it be a valve lifter?

THANKS in advance, you guys are great!

That sounds more like piston slap.
12-08-2009, 10:02 PM
johanh13

Quote:

Originally Posted by trx2stroke4life39

That sounds more like piston slap.

That sounds serious, how much longer will it go? It has only 150,000 miles on it...
12-08-2009, 10:22 PM
WARLOCK

Very common. Dont worry.
12-08-2009, 11:05 PM
txarkitekt

Quote:

Originally Posted by RedHeartbeat

unbolt the converter from the flywheel,push it back and then start the truck and see if you still hear the knocking. Sounds like wrist pins but I may be wrong. If its no longer there then its something in the trans or converter.

Good advice Greg. :thumb: Try that first. If that doesn't cure it--I would suspect the oil pump. How is your oil pressure? Put a mechanical gauge on it and see what you get. If its not at least 38-40 psi at idle, that is where your problem is. If your pressure is ok, then try changing weights of oil.

Quote:

Originally Posted by johanh13

That sounds serious, how much longer will it go? It has only 150,000 miles on it...

No need to worry. Run it that way for another 150k miles. :)

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