Surging Idle, stalling, and fuel pump - Mustang Evolution

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Old 08-31-2014, 11:39 PM   #1
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Surging Idle, stalling, and fuel pump

I have been having alot of idle issues with my fox body lately. It started right after i installed a 70mm throttle body and egr sensor. My cars idle was all over the place and it would stall at every stop. I adjusted the egr sensor and it helped a little but it would still stall. Then I installed a 255lph fuel pump and the problem got even worse. The idle would surge the moment i start the car and alot of the time it would just shut off. Sometimes it wont start so id have to turn off the fuel pump and then start it. I dont know if its to much fuel since all i have done to my car is exhaust, throttle, and cold air. Do I need a tune to fix this? Any help would be apreciated.

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Old 09-01-2014, 12:16 AM   #2
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I wasn't aware that it's possible to adjust the EGR sensor. Do you mean the Throttle Position Sensor?

Anyway, I think that you probably need to adjust the throttle body.
Will the engine run normally if you have your foot on the accelerator and are giving it some "gas"?
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Old 09-01-2014, 02:05 AM   #3
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Yea sorry i mean the throttle position. Yes the car runs fine while im giving it gas and i did not notice any drop in power or hesistation only the idle

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Old 09-01-2014, 02:15 AM   #4
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Yeah, apparently you have to adjust the throttle plates with the set screw on the aftermarket throttle bodies. They need to be set so that a little bit of air flows through when the plates are "closed".
There is a link to how to properly adjust a throttle body in one of our members recent posts... cliffyk. If you can't find cliffyk's link with a search, the information is probably online somewhere if you Google it.
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Old 09-01-2014, 08:13 AM   #5
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I would also check the fuel pressure since you put new fuel pump in.


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