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A/F Problem.

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Old 06-27-2008, 11:39 AM
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explict
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Default A/F Problem.
I went to the dyno yesterday and this is what happened.

So



He said the fuel pressure started to drop at around 4500 so he started to let off slowly to see if it would go back up at all and it never so he let off.

Wtf?

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Old 06-27-2008, 11:50 AM
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ANBAUTO
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Default RE: A/F Problem.
what fuel system are you running?
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Old 06-27-2008, 11:52 AM
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explict
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Default RE: A/F Problem.
Whipple kit
The Dual pump with I think 38# injectors.
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Old 06-27-2008, 11:52 AM
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Default RE: A/F Problem.
Whoa... That definately needs some smoothing.. Maybe a fuel pressure regulator or the pump is on the fritz.. idk thats strange. And you're still putting out 400hp @ 14:1
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Old 06-27-2008, 01:07 PM
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Default RE: A/F Problem.
What should the A/F be at???
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Old 06-27-2008, 02:49 PM
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moosestang
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Default RE: A/F Problem.
You need to check all your wiring for the gt500 pumps. check the second fpdm and check your grounds. I looks like only one pump is working.
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Old 06-27-2008, 03:02 PM
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Default RE: A/F Problem.
yea check the wiring i think as well that only one pump is working for you a/f should be at least 11
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Old 06-27-2008, 04:03 PM
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explict
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Default RE: A/F Problem.
Oh and the engine code I ran a few days back was PO174. Anyone know what this means?
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Old 06-27-2008, 04:41 PM
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Default RE: A/F Problem.
It means the o2 sensors detected a lean condition. It means system too lean. \

http://www.obd-codes.com/p0174
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Old 06-27-2008, 05:06 PM
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Default RE: A/F Problem.
Did you do the install? I'm sure you made a post about it, but my memory is going. Someone had a shop install theirs and they forgot to plug in the second fpdm. Needless to say it ran lean on the dyno just like yours and only made about 400hp before the computer pulled timing and killed power. One of your pumps could be bad or the second fpdm is bad, but i'd check the grounds first.
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