The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)
-   The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)
-   -   whirring noise from under hood (https://67-72chevytrucks.com/vboard/showthread.php?t=477194)

vtwinsport 07-30-2011 01:00 PM

whirring noise from under hood
 
Hey all,
Got a whistling/ whirring noise from the front somewhere. only happens in gear and with the throttle on (under load). It speeds up with rpm.

Can't seem to find it. Have no vaccuum leaks at hoses or brake booster, no belts squealing. disconnected mechanical speedo thinking that was it, it wasn't.
its got a brand new TCI trans and stall.
Could my alternator or power steering be making the noise or do I have a carb/ intake leak that could make that kind of whir/ whistle?
Thanks in advance.

J Knight 07-30-2011 02:50 PM

Re: whirring noise from under hood
 
!st place I would look is,
P/S pump
Alternater
A/C compresser
Water pump
T/converter
tranny pump
Anything that rotates same speed as motor.
Take all belts off and start it "breifly" to see if it stops.

rwhit57 07-30-2011 04:48 PM

Re: whirring noise from under hood
 
Quote:

Originally Posted by J Knight (Post 4819095)
!st place I would look is,
P/S pump
Alternater
A/C compresser
Water pump
T/converter
tranny pump
Anything that rotates same speed as motor.
Take all belts off and start it "breifly" to see if it stops.

You missed the fan clutch. LOL

INSIDIOUS '86 07-30-2011 04:52 PM

Re: whirring noise from under hood
 
my friends truck was turbine powered too. we hacked the fan for a electric and no more turbine noise lol

J Knight 07-31-2011 08:43 AM

Re: whirring noise from under hood
 
Quote:

Originally Posted by rwhit57 (Post 4819242)
You missed the fan clutch. LOL

LOL That would fall under the anything category. LOL

Goldfinger 07-31-2011 09:39 AM

Re: whirring noise from under hood
 
Mine seems to do the same thing it sounds like a hum when in gear and you hit a constant throttle.

mooseknuckles 07-31-2011 06:17 PM

Re: whirring noise from under hood
 
prob clutch fan.

vtwinsport 08-01-2011 09:21 AM

Re: whirring noise from under hood
 
Thanks for the suggestions,
after a bit more searching its got to be alt or pwr steering pump as I have an electric fan and a good spray around the carb and intake with carb cleaner did not change the idle.
That said if removing belts doesn't stop noise, I'll check the waterpump. Seems highly unlikely the new TCI trans could be hooped.


All times are GMT -4. The time now is 08:06 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2026, vBulletin Solutions Inc.
Copyright 1997-2025 67-72chevytrucks.com