Maybe I just never noticed it before and it was already there, but I think I have a new sound coming from the center front of my engine. A buzzing, whirring, medium-pitched sound, when the key is on, engine off. What might that be ? Thanks


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88 GTA 5.7 TPI Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.

 

Start unplugging items untill it goes away. I have seen solenoids, alternators, etc.. all do this.

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
3.73 Posi
4wheel Disc Brakes
Summit 1-5/8" headers, 2.5" Dynomax catback.

Best 1/8: 9.519@72.74

'97 Bonneville SSE

 

could be your heater fan.... but thats not really in the center of the engine.

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1991 Z28 305 5spd 1LE, TES headers, dual cats, 3 Chamber flowmaster, Comp cams .488/.495 212/218, 187 head castings with bigger valves, self-burned eproms.
Gained 20HP by porting and polishing my EGR passage.(some people take this seriously)

All work done by myself, and proud of it!

Find a .bin on the internet and want it burned? I'll do it for you!

 

it's the IAC-valve, touch it and you'll feel it.

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www.marion-becker-nidda.de
91 Firebird 3.1
Modsynomax ultra flow stainless steel -americanracing rims (ar26) rear 15x8 255/60
front 15x7 235/60
www.members.aol.com/tramphorst/pontiacpics

 

GTA,

If the sound only lasts for a few seconds, it could be the fuel pressure regulator bleeding off pressure to the return line. If you suspect this, monitor the fuel pressure while the noise is occurring. If the noise stops when the pressure drops, you've found it.

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Later,
Vader
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"Let the bodies hit the floor!"
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