another "help me my SC SHO wont idle" thread

[Jonny Cash]

Well, after 4 days of tearing into the powerdine setup, trying to make it work, we finnally got it all together.

Since I didnt have the correct bolt for where the stock FPR is, to connect the afternarket FPR line, I couldnt connect it. It must of been a special bolt that I missed when ripping the kit off the previous car it was installed on.

The aftermarket FPR I have is shown in this thread: http://www.shoforum.com/showthread.php?t=62698

Starting the car was really rich right off the bat, and wouldnt hold an idle without stalling after the car warmed up a little. While driving the car ran pretty decent, but as soon as I let off the gas completely in neutral the car would stall. Starting it back up wasnt easy either.

Is the stock FPR in fact overpressurizing my rails, and causing this? Should I try out the SS FPR I have, or just go with the SHOnut one? Is there any other problems I could be having?

It is a 9psi powerdyne with 42lb injectors, a 190lph FP, a LPM, and a ford 80mm MAF. I know this is stupid..but I dont have a FP guage hooked up yet because the one I have turned out to be junk.

 

[40BelowSummer]

Is the LPM calibrated for the said MAF? Also, I believe the "SS" FPR will be better than the stock one, its worked for 35k miles on my car although the mallory SHONut FPR is the ideal FPR. See if someone will borrow you a FP tester and test your fuel pressure.

 

[jeanrw2000]

Well, after 4 days of tearing into the powerdine setup, trying to make it work, we finnally got it all together.

Since I didnt have the correct bolt for where the stock FPR is, to connect the afternarket FPR line, I couldnt connect it. It must of been a special bolt that I missed when ripping the kit off the previous car it was installed on.

The aftermarket FPR I have is shown in this thread: http://www.shoforum.com/showthread.php?t=62698

Starting the car was really rich right off the bat, and wouldnt hold an idle without stalling after the car warmed up a little. While driving the car ran pretty decent, but as soon as I let off the gas completely in neutral the car would stall. Starting it back up wasnt easy either.

Is the stock FPR in fact overpressurizing my rails, and causing this? Should I try out the SS FPR I have, or just go with the SHOnut one? Is there any other problems I could be having?

It is a 9psi powerdyne with 42lb injectors, a 190lph FP, a LPM, and a ford 80mm MAF. I know this is stupid..but I dont have a FP guage hooked up yet because the one I have turned out to be junk.

when you fix yours let me know what you did because i still have to fix my
:laugh_ti: :laugh_ti:

 

[HotRodKid]

get a gauge on there, w/o it you could easily be pushing 70 lbs of fuel pressure into the rails, making it imposible for the car to run right

 

[ManySHOs]

My guess is that you're running pig rich. Get a pressure gauge on the rails. Do you have a wideband gauge too? Plan on ditching the LPM and getting a TwEECer so you can make changes and tune it yourself. The LPM that you're using; is it the same PCM calibration as the one installed in your car?

How long does the car run before it dies? How does the idle sound? Smooth? Erratic? Missing or running on all cylinders?

Did you check the obvious? Vaccum leaks?

Which MAF are you using? (i.e. is it a known good MAF?)

Ian

 

[Lupo]

First things first: Get a FP gauge.
With the fuel pump running, and the vacuum hose to the FPR disconnected, you should be getting 39psi to the rails. Check this out before anything else.

Also, is your LPM programmed correctly for the #42 injectors? It could have the wrong pulse width, and always put it too much fuel at any condition. FP being too high makes it even worse. The computer will read the 02 sensors, and try and compensate, causing an endless erratic idle.
It was stated before, but again your LPM needs to be programmed for the 80mm MAF.

 

[jeanrw2000]

All these knowledgable people here, and 2 responses.. Then when someone asks something stupid like.. "Which is faster, a MTX or a ATX" you end up with 3 pages worth of people trying to prove how much they know about boost. gotta love it.


This is no cheap hobby!!!

sorry boss i would be glad to help not only you but anybody else to. unfortunately my car has the same problem if not similar and i haven't being able to fix it.
in the other hand i am tapping into your thread to find a possible solution myself i hope you don't mind....

Jean.

 

[HotRodKid]

^^^^ do you have a tweecer ?

 

[40BelowSummer]

^^^^ do you have a tweecer ?

Who? johnnycash doesnt (LPM) but Jean does.

 

[jeanrw2000]

Who? johnnycash doesnt (LPM) but Jean does.

yeah just like 40belowsummer said i have a tweecer but i don't know anything about it other than burn,read and load the files..
last time i play with it was like two weeks ago with the help of Jedhead here in the forum and the car hasn't actually stall on me yet but the idle still funky and with and average of under 200 miles per tank yeah i think i am running a little rich.

 

[jeanrw2000]

i check the fuel pressure ok
look for vacum leaks Ok
replace fuel filter ok
installed josh's aftermarke FPR ok
make sure no leaks on the injectors ok
********* smoke stains above muffler tips on back bumper.... OK!!

 

[Jonny Cash]

i check the fuel pressure ok
look for vacum leaks Ok
replace fuel filter ok
installed josh's aftermarke FPR ok
make sure no leaks on the injectors ok
********* smoke stains above muffler tips on back bumper.... OK!!

hahaha. yea me too. except for the regulator.

Ill get it together and update what happens.

 

[Lupo]

i check the fuel pressure ok
look for vacum leaks Ok
replace fuel filter ok
installed josh's aftermarke FPR ok
make sure no leaks on the injectors ok
********* smoke stains above muffler tips on back bumper.... OK!!

You DID adjust and check the FP after you installed Josh's FPR, right?

 

[jeanrw2000]

You DID adjust and check the FP after you installed Josh's FPR, right?

yeah i even did what you told me and rented a vac/boost gun tester tool, and test the FPR itself and it was working accordingly

jean.

 

[Mike Kelly]

Jean,

Just sell me the car.

P.S.--Go do some training, I want my shirt! Mike

 

[Lupo]

yeah i even did what you told me and rented a vac/boost gun tester tool, and test the FPR itself and it was working accordingly

jean.

Ok, that was simply the first step. You have eliminated FP as one of your problems, which is a good thing.

Now, the car is still running too rich.
Why?

1. Injectors are bad, or leaking.
2. Injector parameters are programmed wrong for the injectors you have (most obvious culprit). In other words, it simply needs to be tuned.
3. The computer is putting in too much fuel due to bad O2 readings, or wrong curve on the MAF

 

[Axianator]

Starting the car was really rich right off the bat, and wouldnt hold an idle without stalling after the car warmed up a little. While driving the car ran pretty decent, but as soon as I let off the gas completely in neutral the car would stall. Starting it back up wasnt easy either.

Like Brian (Lupo) has stated, this sounds like classic fuel rail over-pressurization symptoms coupled with an insufficient tune. Once you've aquired an accurate fuel pressure tester, let us know what kind of readings you see and we'll go from there ...

sorry boss i would be glad to help not only you but anybody else to. unfortunately my car has the same problem if not similar and i haven't being able to fix it.
in the other hand i am tapping into your thread to find a possible solution myself i hope you don't mind....

You've Got Mail®, sir.

 

[NCTaurusSHO]

did this kit come off the car that had a dead cylinder you stated in another thread if I rember right you said it had the stock injectors in it? Then the lpm wont work

 

[NCTaurusSHO]

guess not

 

[jeanrw2000]

hahaha. yea me too. except for the regulator.

Ill get it together and update what happens.

Did you ever got your idle fix? and am i the only one with idle problems that i can't fix?