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Author
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Topic: idleing problems
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89Saleen310
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Member # 5397
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posted
 
 
hey i just got a 89 convertable with a gt 40 crate motor and 24 lb injectors with a calibrated mass air flow. It runs pretty good the only problem i have is when it idles sometimes it spikes a little up and down (between 400 and 900 rpm) and then shuts off. Im thinking it might be the trottle body it looks like stock size it has a cobra intake so i know that can handle it. And when it idles right i can rev it up a little bit like to rev at someone and when i lett off the car with spike again and shut off from there. Maybe it needs a tune or something any suggestions
btw: specs
1. Gt 40 Crate motor 345 hp
2. 24 lb injector and mass air
3. Orginial 93 cobra intake from ford
4. bbk cold air intake
less then 5000 miles on all these parts
Thanks
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89 Saleen #310
64 1/2 coupe
73 mach 1
73 vert
66 vert
65 vert
67 coupe
67 coupe
66 coupe
Posts: 1128 | From: Oakland Hills (montclair) | Registered: Feb 2005
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Blind
2.3L
CAFords OG
Member # 3052
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posted
I would remove and clean out the IAC motor/valve and then do a complete idle reset procedure, I don't have a link to post but if you google for it or do a search on corral.net forum I'm sure you'll find it.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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BlueLightning302
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Member # 3974
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posted
i had that same exact problem, tried several different IAC's, nothing worked. I ended up drilling a small hole on the TB plate, never died or had that problem again. First make sure you dont have any vacuum leaks, then i would try that.
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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89Saleen310
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Member # 5397
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posted
ok i'll check the iac at work today. Would getting a bigger trottle body by fix it. And what size hole did you drill. Thanks
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89 Saleen #310
64 1/2 coupe
73 mach 1
73 vert
66 vert
65 vert
67 coupe
67 coupe
66 coupe
Posts: 1128 | From: Oakland Hills (montclair) | Registered: Feb 2005
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BlueLightning302
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Member # 3974
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posted
i think 3/16's or so. what cam does that longblock come with?
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
personally I installed the ford racing adjustable idle plate instead of drilling my throttle body, I have a edelbrock 65mm on an edelbrock intake and it did the same idle hunting until I got that plate in there to give the motor more air at idle.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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89Saleen310
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Member # 5397
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posted
yeah thanks for all the help blind lightning it solved the problem. Yeah the whole reason the guy sold the car was because that problem. So yeah if you go to the gallop around the bay cruz i'll buy you a coke or something
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89 Saleen #310
64 1/2 coupe
73 mach 1
73 vert
66 vert
65 vert
67 coupe
67 coupe
66 coupe
Posts: 1128 | From: Oakland Hills (montclair) | Registered: Feb 2005
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BlueLightning302
¯
Member # 3974
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posted
haha thats good that it worked out!
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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