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Old 07-04-2011, 07:37 PM   #1
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Idle problem

91 stang, has fuel pressure Gage at schratter valve. Runs perfect while driving. When at idle it will spit and sputter, fuel pressure will drop to zero and jump back up to 40. It will do this over and over till it finally dies. I've never seen a fuel pump or other parts do this, as I said earlier. It runs perfect except at idle, any suggestions. My guess would be to change fuel pump and or regulator, but very odd
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Old 07-04-2011, 08:22 PM   #2
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Odd indeed... Is it Possible the volts drop at idle and the relay starts kicking on and off??? Weird problem.
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Old 07-05-2011, 01:57 AM   #3
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Re: Idle problem

my friends car had a similar problem and the mechanic said it was a sensor..not sure of the name or anything but just a guess
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Old 07-05-2011, 11:57 AM   #4
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Re: Idle problem

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Originally Posted by Stang.racr View Post
91 stang, has fuel pressure Gage at schratter valve. Runs perfect while driving. When at idle it will spit and sputter, fuel pressure will drop to zero and jump back up to 40. It will do this over and over till it finally dies. I've never seen a fuel pump or other parts do this, as I said earlier. It runs perfect except at idle, any suggestions. My guess would be to change fuel pump and or regulator, but very odd
i dought it's the filter, but crazier shyte has happend. i would try to run a hot wire straight to the pump, drive it and see wut happens. there should be a thick/heavy gauge "pink w/black stripe" wire in the passenger side kick panel in a square grey plug if i recall correctly. if it does the same thing after straight wiring it... u need a new fuel pump.

hope this helps
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Old 07-05-2011, 04:37 PM   #5
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YeH I'll look at it. I know fp is two years old, I changed fuel filter and hoses at tank two months ago. I'm gonna work on it when I get in from offshore, just a odd situation
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Old 07-05-2011, 04:48 PM   #6
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Re: Idle problem

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Odd indeed... Is it Possible the volts drop at idle and the relay starts kicking on and off??? Weird problem.
that would be my guess as well, or something electrical.
i know i've seen some crazy crap happen with my fox. good luck!
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Old 07-05-2011, 05:33 PM   #7
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Originally Posted by wc3john

that would be my guess as well, or something electrical.
i know i've seen some crazy crap happen with my fox. good luck!
I need it lmao
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Old 07-05-2011, 07:08 PM   #8
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Re: Idle problem

Sounds like you may have a pinhole in the pressure regulator diaphragm and it is over fueling at idle.
If it is one that you can take apart, you can see if there is any fuel on the top side of the diaphragm.

Could also be the TPS is acting up.
You might want to test it and make sure it isn't out of range.

May want to check the IAC too.
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Old 07-05-2011, 07:19 PM   #9
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Quote:
Originally Posted by Trojan Horse
Sounds like you may have a pinhole in the pressure regulator diaphragm and it is over fueling at idle.
If it is one that you can take apart, you can see if there is any fuel on the top side of the diaphragm.

Could also be the TPS is acting up.
You might want to test it and make sure it isn't out of range.

May want to check the IAC too.
Pinhole in diaphram. That sounds very plausible.
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