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Discussing 91 GT DOWN HARD in the 5.0 Mustangs Forum. Need some help please, I recently completed rebuliding and installing a 91 5.0 into a ...

       

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Old April 24th, 2007, 07:44 PM   #1
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91 GT DOWN HARD


Need some help please, I recently completed rebuliding and installing a 91 5.0 into a friends car, after finishing the install, engine will not idle. The engine runs great for about 1 minute if you disconnect the MAF sensor. I was thinking I had a ground problem but have checked every wire from the harness to the 60 pin connector and can't find anything wrong. I have also found and corrected a few small vacuum leaks, but still can't get the car to keep running. The engine does not miss abeat when its running (with MAF unplugged). I am desperate here, I have had the guy's car for three weeks now and he is getting nervous.

ANy help is greatly appreciated. Txs, Phil
 

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Old April 24th, 2007, 11:05 PM   #2
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did you check the maf sensor?
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Old April 24th, 2007, 11:09 PM   #3
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Originally Posted by Racinjason81
did you check the maf sensor?

+1 on that... Also check the IAC valve..
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Old April 24th, 2007, 11:26 PM   #4
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Yea I had that problem once, It took me about 800 dollars to find out a spider laid a nest in the maf sample tube.
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