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post #1 of 6 (permalink) Old 03-10-2009, 09:24 PM Thread Starter
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Air Bypass Valve

What does this do? i was going through all the reciepts from the 88 TC I own form the orig owner and noticed he had had this replaced at LEAST 3 times in 45k miles. Is this a common problem on these cars?????
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post #2 of 6 (permalink) Old 03-15-2009, 01:31 AM
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Originally Posted by JDaly1978 View Post
What does this do? i was going through all the reciepts from the 88 TC I own form the orig owner and noticed he had had this replaced at LEAST 3 times in 45k miles. Is this a common problem on these cars?????
it relieves excess pressure build up in the intake system. like an over flow valve. i don't know the the longevity of them though.

my other ride is an ambulance!
1997 V8 sport - first car - sold 6/7/10
2006 silver mustang gt premiumcustom made grill, frpp shorty headers, pypes cat back exhaust, hurst billet pro shifter,
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post #3 of 6 (permalink) Old 03-28-2009, 12:39 AM
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i dunno about an air bypass valve.
there is a idle air control motor, that can be considered an air bypass valve.
it is common for TC to have high and unstable idle.
maybe this is what the ment. do you have a part number.

TC's did not have a bypass valve for over pressure in the intake from the factory, so maybe it is a mis communication in the name of the part.

Brian J Larkin
1988 Tbird TC 5spd. few bolt ons, 308k miles
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post #4 of 6 (permalink) Old 03-29-2009, 02:01 PM Thread Starter
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Im pretty sure its called Bypass Valve.
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post #5 of 6 (permalink) Old 03-29-2009, 04:47 PM
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BJL is right.. these cars did not come with a boost bypass valve from the factory. Definitely, not a blowoff valve. Idle Air Control makes the most sense, since the function of it is to bypass the throttle blade for, among other things, idle control.

IAC problems aren't limited to these cars either. Most of the time, a good cleaning will fix whatever problems the IAC is having. Parts houses come up with some wierd names for things.

a black car.
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post #6 of 6 (permalink) Old 03-30-2009, 10:34 AM Thread Starter
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You're right...my bad. Its just been one of those weeks!

Im going to try cleaning mine out. Wasn't aware you could, but Im sure I can find some more info in the tech articles.

Thanks.
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