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Old 03-28-2010, 02:35 PM   #1
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Angry Idle Problem Help!!

I have a 1994 GT that I swaped in a 1995 Cobra engine. Since then it well not idle properly and sometimes dies at a stop. I have the same ECM as the GT and it also has no smog pump. When I change the ECM to one that is from a cobra it idles at 3000 RPM. Does anyone know what could be wrong?
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Old 03-28-2010, 03:45 PM   #2
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Re: Idle Problem Help!!

You need to have this combo for it to run correctly, 19lb injectors & the 94 gt computer & 94gt mass air flow meter, or 24lb injectors, cobra computer & cobra mass air flow meter. The cobra computer is calibrated for 24lb injectors & matching mass air meter from that cobra. Make sure this is done before you start trouble shooting.
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Old 03-28-2010, 03:55 PM   #3
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Re: Idle Problem Help!!

I thought that might be an issue, but the parts store claimed both have the same mass air flow
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Old 03-29-2010, 01:01 AM   #4
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Re: Idle Problem Help!!

the cobra has 24 lb injectors. i think the maf's are indeed the same. different pcm's which means different calibrations though. this can be corrected easily though using your same pcm with a chip such as a moates unit or a sct chip.
assuming you have a 5 speed car, you probably have a t4mo computer whereas the cobra has a j4j1 pcm
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Old 03-29-2010, 08:32 AM   #5
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Re: Idle Problem Help!!

getting 5.0L engines to idle right (out of stock range with cams) is a major PITA but can be done as well done when you get to that point prepare for another battle lol.
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Old 03-29-2010, 08:21 PM   #6
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Re: Idle Problem Help!!

I am pretty sure that 1994 has OBDI though. I can't find a tuner for OBDI. Do they make one? Is it even possible to flash a OBDI PCM?
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Old 03-30-2010, 08:33 AM   #7
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Re: Idle Problem Help!!

they make such things but I cant remember who all does it, I know its not SCT or Diablo etc not like the ones on newer cars.
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Old 03-30-2010, 08:12 PM   #8
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Re: Idle Problem Help!!

I Think I Found one. It comes with a chip holder and a cord that is to be attached to the PCM.
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