Cant stay running on a cold start untill you give it gas!

Jaswir · Nov 16, 2010

when its cold...

if i start it will idle for a second then die with out giving it any gas,
do it again and it will die, etc. etc... it would take prob 10 trys before it will idle with out it turning off...

now if i start it and hold the gas pedal to about 2,000rpms for about 4 seconds it will idle just fine after words with just one start...

so im thinking its the fuel pump? fuel filter was just changed with no change in starting!

then every once in awhile it will loose power when driving for about a second like its getting no fuel then run fine!

Also no check engine light on and no codes but smog etc.. but its been removed and caped.

best thing to do is put a fuel gauge on it?? or any other thoughts??

this is a 92 GT t5 stock motor

Mustang5L5 · Nov 16, 2010

Clean and lube the iac. Make sure it's not sticking.

When your car is running stable, pull the plug out of the iac. Does the car stall? If so, your base idle is too low. You need to adjust idle so the car barely runs with the iac unplugged...thennreset the computer and let it relearn idle

Jaswir · Nov 16, 2010

i just set the tps like a week ago to around .99 volts but i will check and clean the iac motor

Jaswir · Nov 16, 2010

i unpluged the iac with the car running and the idle didnt change at all...

Mustang5L5 · Nov 16, 2010

Postive no codes at all other than smog? Which codes did yup get?

HISSIN50 · Nov 16, 2010

Has the IAC actually been cleaned? The greatest IAC DC is during the initial seconds after a cold start. A IAC with some issues can struggle at that time but do alright after that initial period.

Jaswir · Nov 16, 2010

12 - idle speed control out of range
44 - air mangment system inoperative
94 - secondary air system inoperative

got that while the car was running..

just cleaned the iac motor with no change.. was pretty black inside tho! cleaned as best as i could

Jaswir · Nov 16, 2010

but also i need to wait for the engine to cool down a lil to know for sure...

HISSIN50 · Nov 16, 2010

Did you let the cleaner marinate inside the IAC, flush, rinse and repeat several times?

Do you have a spare IAC?

Jaswir · Nov 16, 2010

no spare..

i used brake cleaner and rinsed it out alot. Also used like a q tip to clean inside and flushed several times... i think it might have been stuck it was pretty gumbed up

HISSIN50 · Nov 16, 2010

You have to keep letting cleaner sit in it, dumping and repeating till the fluid starts coming out clear.

I use WD40 for the initial marinating because it doesn't evaporate quickly (and leave the crud behind), as brake and contact cleaners can. Once it's clean, then I rinse it several times with contact cleaner (your brake cleaner might be similar in composition).

Jaswir · Nov 16, 2010

ok thanks

Jaswir · Nov 16, 2010

took it up to the store.... and it died just shut off with out warning. ignition control module is new. took about 5 times trying before it would start!

any ideas on that?

HISSIN50 · Nov 16, 2010

Was it missing spark or fuel, or do you think it was still an air issue?

Jaswir · Nov 17, 2010

Was giving it about 1/4 gas in second. Just shut off no bucking or missing. My guess is fuel

HISSIN50 · Nov 17, 2010

Pull codes again.

Jaswir · Nov 17, 2010

only other codes i got was 21 or 22 about the coolant. but thats because engine temp wasnt up to normal yet

HISSIN50 · Nov 17, 2010

Gotta get it to act up again and test for what's missing.

Cant stay running on a cold start untill you give it gas!

Jaswir

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