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#1
10-10-2008, 01:22 AM
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What is that whistle?
Ok I am stumped, (pretty easy to do) I have a whistle in the engine compartment and I can't find it. I have replaced the PCV valve, and have felt and listened all over the top end and I can't make it change pitches so I can track it. I am lost, all my buddies tried to find it as well. I put on a new carb gasket, new alternator. It whistles on start up and will stop if I lug down the motor, let the clutch out without applying the gas, but when you accelerate it is whistling, it seems like a vacuum leak but I can't find it. I even disconnected the vacuum line at the back of the carb and it didn't seem to effect the pitch of the whistle and the carb had good vacuum. It is very annoying and loud enough that while at a stop light my buddy can hear it from his car and he has a loud 383 Stroker with dumped exhaust. It runs fine idles fine and I also sprayed started fluid around everything and I don't know what to do next. Iam supposed to run it down the track tomorrow night and but am debating as to what to do.
Any ideas? What can I check. Thanks in advance, TG 1968 GTO with a 1969 YS motor, no A/C, Kaufman Aluminum Racing heads, 4 speed.
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'68 GTO 4 speed Life is short, don't waste time worrying about the small stuff! |
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#2
10-10-2008, 11:19 AM
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When you sprayed starter fluid, did you notice an increase in engine speed anywhere?
When did the noise start happening, concurrent with a change to your engine? did it come out of nowhere or did it start gradually? What carb and intake are you running? For now some possibilities: crack in underside of intake manifold. (this was a common problem with late 60's Pontiacs) crack in vacuum pots on distributor or choke (and related vacuum lines) leak in hideaway system somewhere (have you disconnected all vacuum lines from carb? (choke, advance, brakes, pcv etc) leak around intake gaskets leak on carb itself (throttle shafts, maybe a crack in a cap on a blocked port on the carb)
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My Break Away Squad 1969 Fbird (Base, 350, 400HO & Sprint Cvt’s - 400HO & TA Hardtops) 1969 LeMans (2dr & 4dr Hardtop and a Cvt) 1969 LeMans Safari 2 seat Wagon 1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop) 1969 Catalina (3 Cvt’s & a 2dr hardtop) 1969 Ventura 2 Seat Wagon 1969 Executive 4dr Sedan 1969 Bonnie Cvt 1969 Bonnie 3 Seat Wagon (2 of them) 1969 Bonnie Brougham (4dr Hardtop & Cvt) 1969 Grand Prix SJ (2 of them) 1969 2+2 2dr Hardtop (Canadian model) |
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#3
10-10-2008, 12:55 PM
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I once saw a guy take a stethoscope with a plain rubber end to listen for a leak. It looked funny with him listening to an engine at different places with it, but he was able to locate an intake gasket leak.
This may not work with your problem, but it brought back that "funny" memory.
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My Wife: "I thought I married a sophisticated business man, but what I actually got was a redneck fisherman with muscle cars." Some people know all of their rights, but none of their obligations. |
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#4
10-10-2008, 06:10 PM
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Thanks for the responses,
It just started about 2 weeks ago, motor has been in for several years. no change when spraying starter fluid. Proform 830 CFM Carb. I will check everything that you mentioned thanks for the help. TG
__________________
'68 GTO 4 speed Life is short, don't waste time worrying about the small stuff! |
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