Lean out

4.6L Modular 4 valve engine and 4.6L Modular 2 valve engine
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Mustang67s
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Private First Class
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Joined: Sun May 22, 2011 2:12 pm

Lean out

Post by Mustang67s » Mon Aug 10, 2015 5:54 pm

I have a 2001 mustang gt with a P1SC- procharger and accufab 75mm throttle body plenum combo. The problem I am having is during slow cruising basically idle for any more than 1/8 of a mile or so in warm 75-85 weather it leans out and tries to stall so I give it a blip of the throttle and it responds then it will go back to lean again if I continue idleing slowly. Otherwise it runs great when any other driving. I have added fuel down on low side but still has issue. Any ideas would be a great. Also on initial start cold or hot it will be lean for about 20 seconds and run rough, it does this on every start up then the idle will smooth right out after that first lean 20 seconds.

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