94 mustang gt idle problems
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Old February 19th, 2012, 10:50 PM   1 links from elsewhere to this Post. Click to view. #1
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94 mustang gt idle problems


hey, I just got a 94 gt(5-speed), the guy i got it from didn't know much about it either because he just got it on a trade. anyways, by the looks of it, it has gt-40 heads, svo intake, e cam, shorty headers, msd 6al ignition and distributor.
my problem im having with it is, it's not idling right, when im stopped it will idle fine(around 800rpms), but when i go to shift from 1-2-3 etc. it steadily idled at 1500 in between shifts. as well if i rev the car to about 2500(while sitting still), it will take a while(3seconds approx.) for the rpms to drop back down to 800. i tested the tps and it read 1.15(ignition on but car off).

so i took the throttle body off, cleaned it along with the tps and iacv, put them back on and it was just a tad better. still did the rev and it will stay up in rpm thing, so i unplugged the tps and it ran fine and when i revved it, it would drop back down to where it's supposed to be. I plugged it back in and now it doesn't have a cold start idle of 1500or whatever it's supposed to be, it just starts and idles at running temp rpm of 600 now...
I would like to know if anybody knows what my problem could have been, because obviously if i didn't fix anything, the problem is still there and will come back to bite me in the butt in a little while. thank you
the computer was swapped to a fox body computer with maf btw
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Old February 20th, 2012, 10:15 AM   #2
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Tps is supposed to be set at .98. Get some Carb cleaner and spray down your engine a little at a time. If your rpms change at all. You have a leak in that area. Clean the MAF. and also run your codes. If you start and it idles at running temperature your ECT may be bad. But runs your codes before you go replacing things.
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Old February 28th, 2012, 01:14 AM   #3
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Originally Posted by bl_rdrgz View Post
Tps is supposed to be set at .98. Get some Carb cleaner and spray down your engine a little at a time. If your rpms change at all. You have a leak in that area. Clean the MAF. and also run your codes. If you start and it idles at running temperature your ECT may be bad. But runs your codes before you go replacing things.

ok, I will clean the MAF AS soon as i can. umm.... what does ECT stand for?
a couple days after i cleaned my tb,tps and iacv, when i started the car, it idled at running tempature like you mentioned.(and continues to do so). Thank you
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Old February 28th, 2012, 01:16 AM   #4
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Definitely clean the MAF / Air filter for shits and giggles, check TPS volts, but this sounds very much like IAC. And double check vac lines.
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Old February 29th, 2012, 08:01 PM   #5
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Originally Posted by coltenr View Post
ok, I will clean the MAF AS soon as i can. umm.... what does ECT stand for?
a couple days after i cleaned my tb,tps and iacv, when i started the car, it idled at running tempature like you mentioned.(and continues to do so). Thank you
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Old February 29th, 2012, 08:13 PM   #6
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I cleaned the MAF last night, the tps read 1.15 without car running(key turned to on). I changed a vac line(under the rear of plenum) but need to take the fender off to get the other line, to finish!
Also my car ran better with the TPS disconnected, WTFlip! I need to get a 94 mustang chilton manual! haha

Cody, your language is anappropriate... lol You gonna help me out when i drop the tranny? Ill let you catch it when i take the last bolt out! (:
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Old February 29th, 2012, 08:19 PM   #7
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Originally Posted by coltenr View Post
I cleaned the MAF last night, the tps read 1.15 without car running(key turned to on). I changed a vac line(under the rear of plenum) but need to take the fender off to get the other line, to finish!
Also my car ran better with the TPS disconnected, WTFlip! I need to get a 94 mustang chilton manual! haha

Cody, your language is anappropriate... lol You gonna help me out when i drop the tranny? Ill let you catch it when i take the last bolt out! (:
Lol ill help you. No biggie. If the t5 is similar to t45 its not too heavy.
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Old March 8th, 2012, 10:28 AM   #8
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changing the tps soon because the idle actually got worse since the last time i posted! lol
When I fix the problem, I'll post the solution on here!
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Old March 8th, 2012, 01:37 PM   #9
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ECT: engine coolant temperature sensor. Have you ran your codes yet?
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Old March 8th, 2012, 02:53 PM   #10
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Originally Posted by coltenr View Post
I cleaned the MAF last night, the tps read 1.15 without car running(key turned to on). I changed a vac line(under the rear of plenum) but need to take the fender off to get the other line, to finish!
Also my car ran better with the TPS disconnected, WTFlip! I need to get a 94 mustang chilton manual! haha

Cody, your language is anappropriate... lol You gonna help me out when i drop the tranny? Ill let you catch it when i take the last bolt out! (:
Originally Posted by coltenr View Post
changing the tps soon because the idle actually got worse since the last time i posted! lol
When I fix the problem, I'll post the solution on here!
Test the tps first, and ajust it before you replace it. Just cuz its at 1.15 volt with the throttle closed doesnt mean it bad.
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