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Old 01-18-2011, 05:08 PM   #1
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fuel problem

i have an 03 svt powerworks on it. fully tuned and built.while driving the car it will completly lean out and then go back to normal. does it all the time. not really sure what the problem could be. i was thinking maybe it was the fuel pump or one of the injectors going bad. need help thanks.


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Old 01-18-2011, 05:25 PM   #2
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Data log the Fuel Inj pressure drop pid. But it does sound like the pump or filter...
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Old 01-18-2011, 05:26 PM   #3
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we data logged already the tune was still good. just it leans right out. would i be able to do a walbro pump or would i have to do a stock pump
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Old 01-18-2011, 05:48 PM   #4
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The stock SVT pump is a good pump. Is yours original? Maybe you should run a Kenne Bell Boost a pump. Those are good to around 350-370 hp. After that , You would need a return style fuel system. What was the fuel pressure showing in the Data log?

EDIT; you know, It just might be a dirty or bad MAF. Try cleaning it...
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Old 01-18-2011, 06:34 PM   #5
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Seeing a datalog would help if you want to send me one

I would look at what your tuner has the fuel pump setting set to this helps keep the fuel psi up under WOT

You didnt say if this was a WOT issue or a cruise issue

Did you change the fuel filter lately ?

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Old 01-18-2011, 06:58 PM   #6
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this happens on just regular driving. i had ray at mcnews tune it. my buddy said he sent the info over that he wanted to see and said that it looked good. we changed the filter maybe like 10000 miles ago .this is the stock pump and i do hae a kenne belle boost a pump on it. the car makes 265whp.and i have a mafia
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Old 01-18-2011, 07:28 PM   #7
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so under just normal cruise you see it go lean , this is very common with out a log to look over
As you drive the least little tip in or off the throttle it goes lean and it isnt uncommon to see the A/F go into the 16`s even

Like I tell my customers use the wide band o2 for WOT at any other time unless your looking for issues dont use the wide band

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Old 01-18-2011, 07:28 PM   #8
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How is the BAP wired in....... does it still have the pressure switch that kicks it on at 5psi or is it straight wired???
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Old 01-18-2011, 07:40 PM   #9
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u guys got some good questions. i wish i had all the answers for this stuff. i know i am throwing codes saying that it is running rich when i know its not. ive only put 200 miles on it from when i got it dyno tuned and these codes and it leaning out while driving it started happening
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Old 01-18-2011, 07:41 PM   #10
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ya the wide 02 goes all the way up to where it does read its so lean. then kicks back and does it again
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