user_ls1

A little background...

99 z28
Replaced all the pulleys....replaced serpentine belt - all within the last 2k miles. Installed a catch can in the last 2k miles. New Water pump installed. New Radiator installed.
This is when the squealing showed up.


I have a constant squeaking noise (think belt issue) that shows up only around 5-10 minutes of driving. It does not happen on start up. It is loudest while at a stop-typically idling...and goes away as I continue to drive. It shows up with the AC off.


It is a daily occurrence. If I had to guess where it is coming from - I would say the passenger side.


It is hard for me to check while running because when I put it in park- it subsides or goes quite again.



Vacuum leak?
Need a new harmonic balancer?

Docrocket1967

iTrader: (1)

Is your belt being ate up at all or slowly thinned out? Does having a/c on and off have any affect?

user_ls1

It happens if the AC is off or on .
The belt looked really good - especially in the grooves

Docrocket1967

iTrader: (1)

If I had to guess I would point the finger at the tensioner. Even though its new it could be weak

Craigtom86

iTrader: (3)

I would set the parking brake, chock the wheels well, put it in drive, and then get out and try to diagnose. Sometime if I suspect a weak tensioner I will try to leverage the tensioner manually with a ratchet or prybar. CAREFUL WHILE DOING THIS... If putting more tension on the belt manually makes the noise subside I'd say the tensioner is bad or incorrect. It also could be a belt length issue.


[QUOTE]It is hard for me to check while running because when I put it in park- it subsides or goes quite again.

user_ls1

Any recommendations for a belt tensioner ? Ac delco ?


i had a chance to pull over while it was squealing . I pulled the dipstick out and it changed the frequency of the pitch and I heard a bit of power loss .

Any idea what's going on there ?

Docrocket1967

iTrader: (1)

I always replace the belt tensioners with the cheapest one because it seems to me you can buy them all around at different prices and still end up with a weak tensioner brand new. As for pulling the dipstick issue, you didnt happen to notice if your a/c compressor clutch kicked on at that time did you? Could be your a/c tensioner.

z28pat

iTrader: (10)

Did you replace the idlers?

Darth_V8r

iTrader: (4)

Only reason I can imagine the oil dipstick affecting it is if it's related to your PCV.

Regarding tensioner, after replacing it twice due to fatigue I just deleted it.

DANOZ28

iTrader: (1)

doesnt ktech make a tensioner thats suppose to be good?