Weird Noise

mackthehack

mackthehack

DUH...
Apr 16, 2007
831
0
16
07 LBZ Classic...

I have a weird noise after engine is good and hot, and have been driving for about 30 mins. I hear a weird squeal/flutter sound when I let off the throttle upon decelerating. Also hear it occasionally when I accelerate after slowing down. Speeds range from 5-50mph. More noticeable at slower speeds.

Things I have tried... shutting off A/C, applied belt dressing on the ribbed side and back side of serp belt. Noise was still present. Also parked with trans in park. Revved engine to eliminate the turbo possibility and could not duplicate the noise. Checked all rotational components from drivetrain to engine along with wheels and brakes. for rub marks and found nothing. Did notice the noise but it was very faint under front diver side of engine. I know the noise can be traveling. I thought possibly fan clutch, water pump or p/s pulley bearing going out.

Anyone have ideas?

Thanks Mack
 
jraymer

jraymer

<--Tree Hugger
Oct 31, 2008
1,421
0
0
Las Vegas, NV
Did you pull your belt and check all the pullies? Could it be relate to exhaust? Do you have an egr block plate leaking maybe?
Charge pipe rubbing on the brake booster?
 
mackthehack

mackthehack

DUH...
Apr 16, 2007
831
0
16
jraymer said:
Did you pull your belt and check all the pullies? Could it be relate to exhaust? Do you have an egr block plate leaking maybe?
Charge pipe rubbing on the brake booster?
Click to expand...

Exhaust isn't rubbing anything. EGR is completely gone. I will take a look at the charge pipe...
 
DAVe3283

DAVe3283

Heavy & Slow
Sep 3, 2009
3,727
296
83
Boise, ID, USA
You can safely run a Duramax without the belt on. The dash will complain about not charging (duh), but the water pump is gear driven, so no problem with heat.

A quick drive without the belt could eliminate all the accessories and pullies at once.

Sent from my Galaxy Nexus using Tapatalk 2
 
Noreaster

Noreaster

Active member
Jun 13, 2007
2,910
0
36
43
Cape Cod,MA
DAVe3283 said:
You can safely run a Duramax without the belt on. The dash will complain about not charging (duh), but the water pump is gear driven, so no problem with heat.

A quick drive without the belt could eliminate all the accessories and pullies at once.

Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...

what about the brakes & steering? thats going to be sketchy
 
mackthehack

mackthehack

DUH...
Apr 16, 2007
831
0
16
DAVe, that is a good idea about removing the belt and take it for a spin. But, I am in the same boat as Noreaster. Plus, I have a solid axle with 37's...

Thanks for the input guys
 
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