01-18-2011, 06:08 PM
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.
01-18-2011, 06:25 PM
Data log the Fuel Inj pressure drop pid. But it does sound like the pump or filter...
01-18-2011, 06:26 PM
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
01-18-2011, 06:48 PM
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...
01-18-2011, 07:34 PM
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 ?
01-18-2011, 07:58 PM
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
01-18-2011, 08:28 PM
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
01-18-2011, 08:28 PM
How is the BAP wired in....... does it still have the pressure switch that kicks it on at 5psi or is it straight wired???
01-18-2011, 08:40 PM
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
01-18-2011, 08:41 PM
ya the wide 02 goes all the way up to where it does read its so lean. then kicks back and does it again
01-18-2011, 08:49 PM
how should the wide band be wired up now
01-18-2011, 08:52 PM
Ok.... there are 2 wires coming out of the boost a pump that go to a pressure switch (if its hooked up to where it kicks on and off) or they are wired together.
If you have it the first way everytime the BAP turns on you get a large fuel pressure spike.... when you get the spike the ECU will cut the power to the pump trying to control the pressure... which will cause a momentary lean condition as the fuel pressure drops prior to your voltage catching everything back up.
If you bypass the pressure switch the BAP doesnt kick on and off..... which makes it far easier for the ECU to control the pressure....and you dont get spikes then lean spots.
01-18-2011, 09:02 PM
thank you for your great information. its cold as shit in new york right now . so im just trying to do what i can to the car before spring . cus its way to cold to be driving it here and the roads are horrible and all ice.so the first way could be y the system also says that it is running rich because of the big surge of the system hooked up that way. and the supercharger always has some kind of boost going thru it. so this could be a huge part of my problem this hole god damn time
01-18-2011, 09:20 PM
this might have been my problem this whole time then. cus the system is telling me that the car is running rich and i know its not. but when i got to wide open throttle the wide band is right. so maybe ill just change the fuel pump and the filter just for safety measures and rewire the set up. the only bad news is i live in new york and the weather is horrible up here and so are the roads. so driving and testing will most likely be waiting till april or nice weather
01-19-2011, 07:53 AM
I would just re-wire it and check to see if your problem was fixed. Unless you just want peace of mind knowing you have a brand new pump and filter (filter is always good to replace, not as expensive)...but if they aren't broke there is really no need to fix them.