SOL1D

I have this odd noise, only happened recently, its been about 5 months since I bought the car but just recently did this noise appear.

Only happens after the cars been sitting over nite and had chance to cool down, but during the warm up when the rpms start to drop after the car gets warm, and RIGHT when the rpm's hit in between 1500-1000 you hear this squeaking or whine noise for about 5-10 seconds and goes away when the rpm drops a bit more again.

I have NO idea what it could be, when I try pin pointing the noise in the engine bay its so quick and the s2k engine is so loud as is, that its hard to pin point where the sound is coming from.

I try to replicate the noise by holding the rpms in between 1500-1000 which is pretty impossible I might add but i try revving in that general area and no noise what soever, you can only replicate the sound during the warmup.

could it be the Acces. belt? what else could it be?

robmea

It sounds to me like it could be your timing chain auto tensioner. Its a pretty common problem with our cars. Does it sound at all like a baseball card in the spokes of a bicycle ? or a metalic metal sound? Somewhere on here there is a thread with a sound clip of what it sounds like when it goes bad.

SOL1D

Naw, totally doesn't sound like a TCT. I've seen enough videos to know what a TCT sounds like.

And from what i remember TCT would be more of a constant sound then one that happens exactly at a specific RPM only at warmup.

Doesn't sound like anything remotely like a baseball card in a spoke which I know a TCT sounds like.

Sounds like a squeaking or belt whine for those 5-10 seconds which i've mentioned.

Maybe a auto tensioner? belt going bad? alternator going bad? Anyone ideas?

kevos2k

sounds like a belt to me, could be the auto tensioner... i'd get a can of belt lube and spray some on the belt see if the noise stops

bitter

If it is a high pitch whining sound, it's probably the air pump during cold start or under hard throttle. Which is normal.

SOL1D

[QUOTE=bitter,Aug 19 2010, 10:24 AM] If it is a high pitch whining sound, it's probably the air pump during cold start or under hard throttle.

bryan'sf20c

i would like to know also right when the engine rpm is lowering right at 1500 a hissing or blow off valve type noise happens. its been like this since i bought it but now im starting to question if it is normal. its almost like the engines cool down point like. you can hear it, high rev"loud" then slowly the rpms move down and right at 1500 the blow off valve sound happens like its releasing pressure and then the rpm get relaxed and idles fine but you can hear a poop or puff noise from the exhaust from misfiring.. not sure why i get misfire right after this noise happens?