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91 Firebird ac problem....high rpms?

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Old 09-04-2009, 06:28 AM
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Car: 1991 Pontiac Firebird
Engine: V8 305 5.0
Transmission: Automatic
91 Firebird ac problem....high rpms?

i have a 1991 firebird v8 tpi. Whenever i turn my max, normal, defrost on my rpms go up and down, it sounds really bad....like the rest for 2 seconds, they rev for 2 seconds. i poped the hood, and it looks like the carborator stops and starts.
does anyone know what is casusing this problem?
Old 09-04-2009, 10:29 AM
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Re: 91 Firebird ac problem....high rpms?

Originally Posted by RedBones18
i have a 1991 firebird v8 tpi. Whenever i turn my max, normal, defrost on my rpms go up and down, it sounds really bad....like the rest for 2 seconds, they rev for 2 seconds. i poped the hood, and it looks like the carborator stops and starts.
does anyone know what is casusing this problem?
so ur saying u have this intake setup? tpi AND carb?



Old 09-04-2009, 12:12 PM
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Re: 91 Firebird ac problem....high rpms?

Originally Posted by RedBones18
i have a 1991 firebird v8 tpi. Whenever i turn my max, normal, defrost on my rpms go up and down, it sounds really bad....like the rest for 2 seconds, they rev for 2 seconds. i poped the hood, and it looks like the carborator stops and starts.
does anyone know what is casusing this problem?
Look for a vacuum leak inside the dash. All the ventilation stuff is vacuum controlled.
Old 09-04-2009, 12:13 PM
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Car: 1988 iroc-z
Engine: 350 Vortec TPI
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Axle/Gears: 3.73 4th gen Torsen 10bolt
Re: 91 Firebird ac problem....high rpms?

omg......................i have to admit it crossed my mind to do whats in the pic. but to see it was done...............................where did you find that?
Old 09-04-2009, 08:24 PM
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Re: 91 Firebird ac problem....high rpms?

Originally Posted by regal301
omg......................i have to admit it crossed my mind to do whats in the pic. but to see it was done...............................where did you find that?
someone else posted it on an iroc-z forum...iroczone.com

i was just wonderin...hard to try and help..im tryin to figure out wat is stopping and starting...
Old 09-04-2009, 09:16 PM
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Re: 91 Firebird ac problem....high rpms?

i bet its the compressor kicking on and off ...........low on freon.


THAT PICTURE IS GREAT,AND I THOUGHT I WAS F#$%^& FOR THINKING ABOUT IT SOMEONE ACTUALLY DID IT .........................

TRAILER PARK STYLE TPI

I WAS BORN IN A TRAILER PARK (not trying to trash anyone)

Last edited by regal301; 09-04-2009 at 09:23 PM.
Old 09-06-2009, 11:23 PM
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Re: 91 Firebird ac problem....high rpms?

Originally Posted by regal301
i bet its the compressor kicking on and off ...........low on freon.
ya plus one on that....sorry to the OP just ur choice of words...couldnt visualize it myself lol
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