TB or IAC problem??
08-13-2004, 07:30 AM
#1
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Location: Lake Zurich, IL
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TB or IAC problem??
i swapped injectors yesterday and when i started it up it sounded supercharged. but its not. the noise was coming from the IAC. is it bad? ther is no ses light and it was fine before. btw its a bbk 58mm and ive had it on for 1100 miles wiithout the blower whine
08-13-2004, 08:33 AM
#2
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Re: TB or IAC problem??
Originally Posted by 350TPI5SPEED
i swapped injectors yesterday and when i started it up it sounded supercharged. but its not. the noise was coming from the IAC. is it bad? ther is no ses light and it was fine before. btw its a bbk 58mm and ive had it on for 1100 miles wiithout the blower whine
When cold the ECM should shorten the pintle length to provide more air, when warm the ECM should lengthen the pintle to reduce air. If you can't measure any decernable difference in length hot, or cold, the IAC, or ECM, or anything in between is faulty.
If you have the time do the minumum air setting per factory procedure (baseline idle 400-450rpm, I think.)
If you need it I can email it to you, mine is an 88, but the procedure should be the same.
08-19-2004, 06:49 AM
#8
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Re: TB or IAC problem??
Originally Posted by 350TPI5SPEED
when i replaced the iac i cleaned it with carb cleaner. im not hearing anything from the iac when the key is turned.
You probably won't hear the IAC. What you need is a scantool to observe the IAC count when the car is running.
08-19-2004, 03:55 PM
#9
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Location: Grandville/ Grand Rapids, Michigan
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Re: TB or IAC problem??
Did you forget to hook up the vacuum lines? Also, if you hear a whine check your alternator. I know mine started to sound like one when it was going bad.
08-19-2004, 11:46 PM
#10
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Re: TB or IAC problem??
housing was cleaned with carb cleaner and my toothbrush. vacuum lines all hooked up. its not the alt. it is coming from the iac for sure. when ii put my finger over the passage it kinda stops
08-20-2004, 12:50 AM
#11
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Re: TB or IAC problem??
Did you accidently crack the IAC housing? Or is the gasket maybe broken?
Sounds like a vacuum leak of some sort because there is nothing else but alternator or vacuum leak I have EVER heard from my motor that would sound like a blower whine. Get Carb Cleaner and spray it at the IAC when the motor is running... if the idle changes you found your problem.
Sounds like a vacuum leak of some sort because there is nothing else but alternator or vacuum leak I have EVER heard from my motor that would sound like a blower whine. Get Carb Cleaner and spray it at the IAC when the motor is running... if the idle changes you found your problem.
08-21-2004, 01:05 AM
#12
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Re: TB or IAC problem??
Originally Posted by 350TPI5SPEED
housing was cleaned with carb cleaner and my toothbrush. vacuum lines all hooked up. its not the alt. it is coming from the iac for sure. when ii put my finger over the passage it kinda stops
