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Author Topic: high idle after intake change  (Read 2792 times)
4 Banger
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Posts: 25

Location: dallas oregon

« on: November 07, 2010, 04:18:56 pm »

1989 302

after intake change high idle

was told i need to reduce the size of the idle air control opening or block it off

tb is 70 mm cobra unit with cobra maf meter

ecc is the police a9t unit
Big Block
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Posts: 609

Location: West Valley City, Utah

« Reply #1 on: November 07, 2010, 09:46:31 pm »

$10 on a vacuum leak. The intake should not change any part of the idle, if you are using the same electronics. What else have you changed, and what codes do you pull up?

1987 Ford thunderbird. sn-95 t-5, f-150 clutch and flywheel behind a 5.0 s.o. weighs about 3500lbs.
1986 cougar gs. 5.0 s.o. and aod.
Stroked Small Block
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Posts: 426

Location: albany, KY

« Reply #2 on: November 08, 2010, 12:34:55 am »

my vote is for a vacume leak as well...I changed intakes a couple years ago and had the same problem.  Lower intake gasket was the culprit, I took my time and reinstalled to get it right.  If you changed throttle bodies on your intake, did you set your idle on your new one? 

89 GT  a carbed, iron headed 308 on spray  11.02@121,7.07@100
El Hombre
Big Block
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Location: Puerto Rico
Miracles?.... by appointment only!

« Reply #3 on: November 08, 2010, 06:42:05 am »

1989 302

after intake change high idle

was told i need to reduce the size of the idle air control opening or block it off

tb is 70 mm cobra unit with cobra maf meter

ecc is the police a9t unit

You were given misinformation on that "correction" as the guys already mentioned. Looks like you have a vacuum leak, TB blade too open, stuck IAC valve in partially open position, or EEC not detecting closed throttle position. Suggest to check for vacuum leaks and pefrom a base idle reset = http://sbftech.com/index.php/topic,1031.0.html ..... LUK


'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2

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