a3ill

I have had the rockers, pushrods, lifters and valve springs replaced and i still have a noticable tapping. Before i replaced the lifters, you could hear it all the time. After lifters replaced, you only hear it after about 2000rpms and up. Does anyone have any suggestions? I know i will have to have it tore back down, just hoping someone would have some ideas. Thanks for any info. Sorry it is a 98 t/a

vettenuts

iTrader: (4)

Is this an all stock motor? Are you sure its not the injectors, sometime they can be quite noisy as well but its not a "metal on metal" sound.

93LS1RX7

iTrader: (8)

LS1's have a slight tap to them. I havent seen one without it.

a3ill

The motor is all stock besides what i've listed. I had it hooked up to a diagnostics machine, which i think was bs. The guy said he killed the cylinders and said it was a weak lifter. Well that wasn't it, so i don't think he even hooked it up. He got my 75 bucks though. Another mechanic i know said the diagnostic machine shouldn't be able to tell if it was a lifter anyway. It would just tell if their was an electrical problem. I am not a mechanic though so i don't know. So this is where i'm at. I'm sure I will just have to pay another $1,000 to have it tore down again.

a3ill

I know they have a slight tap. I heard that when i got the car, but this is no slight tap. alot of people said it might be a flat lobe on the cam, but a mechanic at a GM dealership said the lifter would probably go before the cam would. So i'm guessing its a bearing or timing chain. I'm hoping its not a wrist pin.

hals73rs

iTrader: (4)

Try pulling off one spark plug wire at a time. If it's a wrist pin or rod bearing the noise will quiet down alot if not completely.....

Crazy Man

iTrader: (6)

Mine did the same it was a spun rod bearing...

a3ill

thanks for the help.

DaddySS

I sit quiet up to the 200 rpm you stated or just not as loud? Can you isolate it down to a particular cylinder?

a3ill

my mechanic said it was 1 or 3 i believe

Teutonic Speedracer

iTrader: (20)

I had a tapping sound that was a bad lifter/cam lobe. You may have to dive into the motor a bit deeper than you have.

distortion_69

iTrader: (20)

Make sure your plugs are tight. Problem could be fixed but a plug backed out and now it's sorta loud.. also could be an exhaust leak or something when they put the head back on. I'd look for the cheap problems first, cuz it'd suck to tear the motor down to realize it was something stupid.

Good Luck,
Josh