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Reload this Page 91 Firebird ac problem....high rpms?

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Old 09-04-2009, 07:28 AM   #1
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Car: 1991 Pontiac Firebird
Engine: V8 305 5.0
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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?
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Old 09-04-2009, 11:29 AM   #2
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Location: Anne Arundel County, MD
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Car: 1986 IROC-Z28
Engine: 305 TPI
Transmission: rebuilt 700R4 w/ shift kit
Axle/Gears: 3.23 l.s.

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Re: 91 Firebird ac problem....high rpms?
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Originally Posted by RedBones18 View Post
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?
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Old 09-04-2009, 01:12 PM   #3
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Re: 91 Firebird ac problem....high rpms?
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Originally Posted by RedBones18 View Post
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.
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Old 09-04-2009, 01:13 PM   #4
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Car: 89 formula 350
Engine: 350 vortec L31 w/TPI map/7730 ecm
Transmission: 700r4/corvette shift servo
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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?
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Old 09-04-2009, 09:24 PM   #5
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Re: 91 Firebird ac problem....high rpms?
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Originally Posted by regal301 View Post
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...
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Old 09-04-2009, 10:16 PM   #6
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Join Date: Sep 2007
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Car: 89 formula 350
Engine: 350 vortec L31 w/TPI map/7730 ecm
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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 10:23 PM.
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Old 09-07-2009, 12:23 AM   #7
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Re: 91 Firebird ac problem....high rpms?
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Originally Posted by regal301 View Post
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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