ENGINE KNOCKS

[steve1996gmc]

I have a 1996 GMC truck with a 5 Litre Vortec and when I start it cold there is a knocking sound coming from the divers side of the engine. However it goes away as the engine warms up. When warm you can still hear a slight noise which sounds similar to an exhaust leak(but is not). I have read that the later models have had issues with piston slap due to carbon build up on the ring lands. Is this a problem in this year? and is there a solution for the problem?

 

Thanks

[Halen5150]

I have a 2000 5.3L and it does the same thing. I bought the truck two years ago at about 50k miles, now it has over 85k miles. About 70k it started knocking. I've used Quaker State 10w-30 ever since I've owned the truck. A few days ago, I switched to 10w-40 to see if the knock would disappear. I think the startup knock is gone, but the lifter tick or "exhaust leak noise" has gotten worse. I didn't mind the engine knock so much at startup because it went away after a few seconds, but this lifter tick is driving me nuts. It's louder than my d@mn exhaust! Not to mention, when I'm on the freeway(next to the barrier) or at a drive-thru, I can hear the noise ricochet off of the wall, and it sounds like crap. I think the noise is only present on the driver's side, and it's always there whether I drive 1 mile or 100 miles in a single trip. Please, is there any way to fix this?

[mark hoffman]

I have a 2000 5.3L and it does the same thing.  I bought the truck two years ago at about 50k miles, now it has over 85k miles.  About 70k it started knocking.  I've used Quaker State 10w-30 ever since I've owned the truck.  A few days ago, I switched to 10w-40 to see if the knock would disappear.  I think the startup knock is gone, but the lifter tick or "exhaust leak noise" has gotten worse.  I didn't mind the engine knock so much at startup because it went away after a few seconds, but this lifter tick is driving me nuts.  It's louder than my d@mn exhaust!  Not to mention, when I'm on the freeway(next to the barrier) or at a drive-thru, I can hear the noise ricochet off of the wall, and it sounds like crap.  I think the noise is only present on the driver's side, and it's always there whether I drive 1 mile or 100 miles in a single trip.  Please, is there any way to fix this?

 

<{POST_SNAPBACK}>

 

 

 

 

BOTH OF YOUR ENGINES HAVE WHAT GM CALLS PISTON SLAP. THEY CALL IT NORMAL. HOWEVER, MANY ATTORNEY'S ARE FILING CLASS ACTION SUITS AGAINST GM TO FIX OR RECALL ALL DEFECTIVE ENGINES.... GM TOLD ME TO USE AC FILTER WITH 10W30 OIL. I ALSO PUT SOME SLICK 50 IN THE CRANKCASE. I HAVE A 2001 SUBURBAN WITH A 5.3 (64K). DON'T HOLD YOUR BREATH ABOUT GM REPLACING OR FIXING THIS PISTON SLAP ANY TIME SOON.

GOOD LUCK