AnonymousG

iTrader: (2)

I have a 92 SC300. Car has 160K on it.

Recently when I start it in the cold the car would make a chatter sound or what sounds like chatter. When I first start it for couple seconds then it goes away. It also happens when I accelerate at WOT or under hard acceleration.

What could it possibly be?

Could it be my belt tensioner bearing going bad?

Thanks and appreciate the help.

AnonymousG

iTrader: (2)

any help or ideas?

scoobySC3

iTrader: (1)

Would it be possible to take a video or sound clip of it? Could be anything from valve tap to piston slap or a bunch of other things. Also may not be a bad idea to pop the hood before you start it in the morning, and either have a friend start it, or start it and jump out to try to pinpoint where the sound is coming from. You can also take off the top timing cover and look for any irregular marks on the timing belt, generally a bad idler or pulley will create odd wear on the belt.

Notice any smoke from the exhaust during WOT?


Thanks,
Rick

LEX_MAN

iTrader: (2)

Mine does that too, been doing it for 2 years now. When you start it goes CLACK CLACK CLACK and goes away ?

Its probably bearings not getting oil fast enough.

AnonymousG

iTrader: (2)

'll check the timing belt when I get home. I'll also do that other tip also.

Only smoke that comes out of the car is when i first start it, but I also have the 12v mod, so i dont know if it would make it smoke either. and the smoke goes away after its warm.

thanks

Did yours only do it when you first start the car?

My car has the chatter at start when cold, at WOT, along with hard acceleration. But doesnt do it when the car is idleing or crusing.

AnonymousG

iTrader: (2)

I didnt get to check the timing belt, since I misplaced my HEX set.

But i did have someone else start it when I was outside looking at the engine.

Is it normal for the serpentine tensioner to shake on first start up?

WadeLovell

iTrader: (5)

No, it is noy normal if I understand your description. The bearing for the tensioner may be shot.

WadeLovell

iTrader: (5)

Sorry "not" normal. Small phone keyboard ;

chingpo05

iTrader: (2)

tensioner bearings make a whining noise when bad and will progress with speed. is your car sitting for long before the cold start? is it making noise from upper or lower part of motor, also front or rear

WadeLovell

iTrader: (5)

Stethoscope may be helpful.

AnonymousG

iTrader: (2)

I think the bearing is shot, when my car starts the tensioner moves and rattles until it gets steady, and when i rev the engine the tensioner moves quite a bit.

the car is sitting anywhere from over night to only an hr. its making it from the front.

SexCoupe

iTrader: (6)

remove the serp belt then turn the car on see if it makes the noise still

AnonymousG

iTrader: (2)

So, I was wondering would it be ok to just change the serp. tensioner pully with a new one? Autozone sells a new one with a bearing for $20.

AnonymousG

iTrader: (2)

So the noise is still there but not as noticeable, I'm going to be doing some maintence stuff to see if it helps.

I'm pretty sure the acceleration rattle is from the heatshields, since when i looked under the exhaust was bent.

Ill92SC3

sorry to bring up an old post but would just getting the 20$ tensioner pulley work the same as if i get the whole tensioner? i just need to replace the bearing not the whole tensioner but autozone doesnt sell the bearings alone.