All times are UTC - 6 hours [ DST ]




Ask A Question Reply   
Author Message
 

contributions: 6
1997 Grand Prix GTP supercharged makes a weird grinding noise at idle or when the RPM drops below normal idle. Could it be the supercharger itself, or a pulley to something?


Share on FacebookShare on DiggShare on DeliciousShare on TechnoratiShare on TumblrShare on Google+
   
Reply with quote  
* Search   
 
User avatar

contributions: 50
Could be lots of things, lets concentrate on narrowing it down a little.
With the motor off and key out of the ignition, reach down and shake the idler pulley(s) for your belt.
Excessive play will usually rattle, squeak, whine, and make a racket.

If no play there, get a piece of hose or gas line and carefully put it to your ear while the motor is running.
Scan the engine compartment to narrow down the general direction. You can touch stationary points to listen more if needed. Check the alternator especially, they're prone to bearing wear (usually rear)
Be careful not to get near any moving parts- with your fingers, clothes, jewelery, or the hose.

Some will use a screwdriver but use the hose- it's safer.
_______________

Shade-tree mechanic

Did You Find Some Great Help?
Why make a small tip / donation to show your appreciation-
Help Keep Us Free


   
Reply with quote  
 

contributions: 6
The grinding Sounds like it is coming from the middle of the supercharger.


   
Reply with quote  
 
User avatar

contributions: 50
Unfortunately, if the sound is coming from the supercharger then it's your problem.

Did you notice any other problems?
High water temp reading, low pick up, lag in power at take off, boost pressure gauge (if installed)?
What is the oil pressure when at idle?
_______________

Shade-tree mechanic

Did You Find Some Great Help?
Why make a small tip / donation to show your appreciation-
Help Keep Us Free


   
Reply with quote  
 

contributions: 6
Everything is fine. The oil pressure is perfect, the boost gauge is fine, coolant is fine, and the car does not lack any power. It will fly. The tensioner pulley near the front diagonally down from the supercharger is definitely bad. I'm going to replace thatfirst and go from there. Thank you so much for your time and for your help. I greatly appreciate it.


   
Reply with quote  
 
User avatar

contributions: 50
You're welcome- glad you found a wobbly pulley to be honest because those superchargers can be a pain- hurts the wallet a bunch too.

Hopefully it's just the pulley bouncing and the sound is traveling up the body of the charger. Keep us informed when you get that changed :)
_______________

Shade-tree mechanic

Did You Find Some Great Help?
Why make a small tip / donation to show your appreciation-
Help Keep Us Free


   
Reply with quote  
 

contributions: 6
I will. And I know. The cheapest supercharger I found was $700 with $180 core charge. I can't afford that. $50 for the pulley I can deal with.


   
Reply with quote  
Ask A Question Reply   

   Similar Topics   Author   Replies   Views   Most Recent 
New Articles View the first 99 grand prix hose

in Pontiac Grand Prix

tracybunkelman1

1

943

Wed Oct 08, 2014 8:38 pm

carriedi View the latest

New Articles View the first 77 pontanic grand prix sj

in Pontiac

sscheide82

1

970

Sun Oct 12, 2014 1:40 am

carriedi View the latest

New Articles View the first 1995 Grand Prix Gtp won't idle

in Pontiac Grand Prix

Pipeboy

1

658

Wed Apr 13, 2016 12:46 am

carriedi View the latest

New Articles View the first 2002 Pontiac Grand Prix GTP

in Pontiac Grand Prix

jwm69chevy

5

1754

Tue Mar 28, 2017 9:30 am

Jessycarpenter View the latest

New Articles View the first 2007 Grand Prix no Low Beams

in Pontiac Grand Prix

ellen

1

871

Fri May 22, 2015 3:04 am

carriedi View the latest

New Articles View the first throttle body for 2004 grand prix

in Pontiac Grand Prix

ralph

1

1102

Sun May 03, 2015 4:12 pm

carriedi View the latest

New Articles View the first 1996 grand prix transmission problem

in Pontiac Grand Prix

birdie

3

978

Fri Mar 27, 2015 4:22 am

carriedi View the latest


All times are UTC - 6 hours [ DST ]



Search for:
Jump to:  
Contact Us