Ive been having this problem for some time, and im not sure whats causing it, so i need some help before i tear my car apart trying to fix it. Just recently my car has started making a whistling noise that comes and goes. When the my car is first started the whistling starts and is there when i drive. But after driving the sound goes away when the engine drops below 1500 RPM's. once i go above 1500 RPM's though, the whistling noise starts up. I havtn had a loss of performance as far as i can tell. The sound is hard to pin point but best to my knowledge its coming from the area of crankshaft pulley on the disributer. not positive. Could it be the crankshaft making this noise? Since the noise goes away after dropping below 1500rpm? I dont know...need some help!
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z28marineTags: None
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Any chance you have a BBK aftermarket throttle body? They are notorious for having a "whistle".... almost a "blower" sound. And the problem is caused by casting flash in the idle air passages, so it is a noise that is going to be prevalent with the IAC motor in an "open" position, as it might be on cold start, of when the idle is being help up higher on coastdown.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
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Strange, for about 1 1/2 weeks I had a similar noise coming from my T/A. When I first started it was really loud but I couldn't pin point it, just that it came from the front of the engine. After driving for a while it would quiet down but not completely disapear.
I visited a friend which lives close by and when he heard it he said it came from the belt due to the high humidity. (It was very hot and humid during that period of time).
Now it cooled down and the humidity is lower and the noise (I would call it "chirping") hasn't appeared again.
Coincidence or did something eventually let go and I didn't notice? Runs fine though.97 Trans Am A4 more or less stock (Mods: WS6 Ram Air with Fernco & K&N, 12 disc CD changer, power antenna, SLP Fan Switch, LS1 Aluminum DS, Borla Cat back, McCord power plate, Spohn tower brace, Sirius, HID fog lights)
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BAS
no problems ever here
I've used a 58mm Edelbrock/BBK T.B. and had no
problems.
I now have a 52 mm Edelbrock/BBK T.B. and still have no problems.
Originally posted by Injuneer
Any chance you have a BBK aftermarket throttle body? They are notorious for having a "whistle".... almost a "blower" sound. And the problem is caused by casting flash in the idle air passages, so it is a noise that is going to be prevalent with the IAC motor in an "open" position, as it might be on cold start, of when the idle is being help up higher on coastdown.
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Re: no problems ever here
Originally posted by BAS
I've used a 58mm Edelbrock/BBK T.B. and had no
problems.
I now have a 52 mm Edelbrock/BBK T.B. and still have no problems.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
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