GlockLT4

What would cause a rattling noise above 3500 in gear (driving) only. If i rev her up with it in Neutral, there's no noise.. but driving there is. I even tried putting it in Neutral while rolling down the road at 50mph ... no noise.

It's noticeable in the car and as an echo off of a wall or cement pillar next to me when driving.

GlockLT4

no one? :(

chucks88

My exhaust rattles a bit at higher rpm's(in motion only). Check your exhaust hanger between your rear y-pipe and your torque beam. I have gone through two in 10 months.

GlockLT4

I hope it's something as simple as that!

snaketr

Make sure it is not a ping. Sometimes when a motor is pinging it sounds like a rattle under the hood and it will only happen under load. Therefore it will not do it in N.

GlockLT4

Computer doesn't pick it up as detonation (no spark retard or knock counts).

R23HTC

Auto tranny. :jester Seriously, hope you figure it out. Maybe you should bring it over here so we can get it up in the air? Let me know.

GlockLT4

I can get it up in the air here, and next week it should be in the garage for the rest of summer :cheers: :cheers: :cheers:

snaketr

I had an L98 that did the same thing. We were using a DFI and the knock sensor also did not pick it up until I replaced the sensor. Check and see if it is working, with the key on and engine off, use a plastic hammer and hit the side of the block and see if it picks it up. They work off of a certain range of frequency and it could be that yours is just not working.

GlockLT4

hmm.. there are two of them though .. and they are both brand new. And i don't know that the computer will tell me about knock if the engine isn't running.

I need to put some race gas in here and see if it goes away. If it does, i know it's detonation.


[Modified by Glock'94, 8:58 PM 7/14/2002]

snaketr

The engine will not tell you anything. But the computer will tell you if it is picking up the signal. That is all I can offer to you without actually hearing this thing for myself. Good Luck.