Two questions, one thread !!11one

DaGeneral · 03-07-2006, 07:01 PM

Alright, so today I turned my car on and I heard a high pitched noise which was driving me nuts. But then I thought, it could be Piston Slap, but then again, I have NO clue on what it sounds like. When the temperature got up to normal the noise stopped. Is that what it was ?

Also, I bought 5W-30 Mobil 1 synthetic and Im not sure if that one of 10W-30 is the correct one to use ? ( I just bought the car) what do you guys suggest?

Thank You

**SeVeReDiStOrTiOn** · 03-07-2006, 08:39 PM

Originally Posted by DaGeneral

Alright, so today I turned my car on and I heard a high pitched noise which was driving me nuts. But then I thought, it could be Piston Slap, but then again, I have NO clue on what it sounds like. When the temperature got up to normal the noise stopped. Is that what it was ?

Also, I bought 5W-30 Mobil 1 synthetic and Im not sure if that one of 10W-30 is the correct one to use ? ( I just bought the car) what do you guys suggest?

Thank You

The high pitched sound could be the belt slipping due to either a worn belt or bad tensioner, idler pulley could need to be replaced or/lubed, could also be the A.I.R. pump showing signs of going out. The air pump injects fresh air into the exhaust manifolds during cold starts to help with emissions and is on the driverside under the headlight on a camaro...prob the same on a TA.

Either oil is fine..they're both 30 weight. The diff between 5w and 10w is very slight...i think 5w is like 59 cst and 10w is 66 cst.

EDIT: As far as piston slap...it sounds like metal slapping metal really fast, and goes away when the engine warms up because metal expands when hot and the piston fits the cylinder better.

DaGeneral · 03-07-2006, 08:55 PM

Crap, I just remembered something... Could the Serpentine belt cause this ? It was recommended by my mechanic that I change it soon. He said it was beginning to show signs of wear.

**JEB** · 03-07-2006, 10:16 PM

Yes

**Transam388** · 03-08-2006, 07:04 AM

If after changing the belt you still hear that noise it probably is one of the tensioner pulleys. I had the same type of thing where I changed belts and still had an annoying whine noise and it turned out to be the A/C tensioner pulley.

**02z28ls1** · 03-08-2006, 09:29 AM

Does it sound like a vacuum cleaner? That's a normal air pump sound if it does.

**SeVeReDiStOrTiOn** · 03-08-2006, 10:26 AM

Originally Posted by DaGeneral

Crap, I just remembered something... Could the Serpentine belt cause this ? It was recommended by my mechanic that I change it soon. He said it was beginning to show signs of wear.

Did you not see my other post? Yes the belts can cause it...there's 2 belts, i'd change them both

**Roastem** · 03-08-2006, 11:29 AM

Take a water hose and spray a little on the belt while its running, and it is not squealing. If it starts making noise, then replace your belts. Bad belts on those LS1's are real sensitive to moisture. They start making a serious racket when it rains or after washing your car. Or, take the belt off and bend it, look for cracks. If you see any, replace your belts.

**hammertime** · 03-08-2006, 03:49 PM

Originally Posted by Transam388

If after changing the belt you still hear that noise it probably is one of the tensioner pulleys. I had the same type of thing where I changed belts and still had an annoying whine noise and it turned out to be the A/C tensioner pulley.

get new belts
take the old belts off, then start the car for just long enough to hear that the noise is gone
put the belts on one at a time to see if the noise comes back

Chances are, new belts will fix it. If not, you'll eliminate a few things by doing it as stated above.

**Orcus79** · 03-08-2006, 04:24 PM

I doubt its the belts, it would be an extreamly lound squeal and won't go away when the engine reaches proper operating temperature. My 02 has tha same sound, when the engine warms up it snaps away, to use an audio term there is no fade. Like there is an electric clutch relaesing much like the a/c clutch does. It sounds like a low volume vacuum motor or a supercharger whistle. Nothing indicates a problem. Is there any modification or filter in the A.I.R. system that would cause this?

**keliente** · 03-08-2006, 05:26 PM

It is the air pump and it is completely normal. It turns off after the car has reached a certain temperature...it's main purpose is to heat the cats when the car is cold in order to enable proper catalytic converter operation.