So in trying to get my car ready for the turbo setup we decided to install some fuel goodies this weekend. We installed a ge fuel rail, aem fpr, and a walbro 255. Problem is the car is bogging now, car needs to be revved to start and stay alive when it comes to a full stop. The idle is getting wierd, its under 1k im guessing around 800 - 900 rpm's but it bounces between there and almost dieying out.
We installed this on stock injectors and the fuel pressure gauge is reading 40psi.
Is the reason for the problem the stock injectors? Any help will be much apprecaited.

 

As long as the base pressure is within specs, there should not be any problems.

Have you tried increasing/decreasing fuel psi?

 

from what ive heard fuel pressure should be at 42
i didnt think 2psi off would make this big of a difference so im thinking its something else

 

pull your plugs to see how they look.
That will give you a good indication if it's fuel related or if it's mechanical (wiring,loose connector etc).

 

when i put my FPR on the other day, i put the gauge on first to see what the PSI was stock, it came out to be 28. though ive got a LS.

 

B&M gauge?
28 sounds kinda low for a stock fpr.

 

try to lower the psi.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by g5r &raquo;</TD></TR><TR><TD CLASS="quote">try to lower the psi. </TD></TR></TABLE>

Thats what i'm thinking, usually those pumps raise your static fuel pressure so you are most likely runing to rich

 

your running to rich lower the pressure, you have a fuel pressure guage right?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eviloliv3 &raquo;</TD></TR><TR><TD CLASS="quote">when i put my FPR on the other day, i put the gauge on first to see what the PSI was stock, it came out to be 28. though ive got a LS.</TD></TR></TABLE>

dood you dont just put an fpr on and go you have to adjust it , did you not read the directions????

 

pull out the pump again and check the connections and all for any bad connects, etc. had a friend hook his up and had same problem....was because intank connect was loose so it couldnt build up enough pressure at idle AT THE PUMP...not the rail...at the pump so it couldn't flow enough fuel.

 

we havent noticed and leaks or anything, and the wiring seems fine. All signs point to the fact its running rich, so were gona start turning the fuel pressure down. Ill post results later. thank you for the replys.

 

38-42 with the hose off...when its on your around 30

 

i think i had mine set to 36psi with the hose on...idled fine.

But yea, try to lower the fuel pressure. It does sound like your running to rich.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eviloliv3 &raquo;</TD></TR><TR><TD CLASS="quote">when i put my FPR on the other day, i put the gauge on first to see what the PSI was stock, it came out to be 28. though ive got a LS.</TD></TR></TABLE>

wierd as it sounds, we dummed mine down to around 30 to 31 psi. and its running better now. Still need to tap the gas to start it, but its better none the less.
My timing is a bit advanced, would that in anyway contribute to this problem?

 

30-31 seems low to me... I was running 40psi with my sohc on stock injectors, stock ecu, walbro 255 and AEM FPR. My helms says ~31-38psi with vacuum and ~40-47psi with no vacuum. That's on a sohc. Did you make sure the nipple in the FPR is not obstructed? Mine was clogged for weeks until I found out. Caused the car to bog and hesitate under partial throttle... My $.02

 

When I was driving to the tuner on the basemap, the idle would bounce VERY low, almost cutting out, but it never did. Got it tuned and now its fine.

 

dude.. did you pull your plugs yet or what??

what do they look like

thats the first thing you shoulda done.

as b16ahybrid said

 

Your compression is really low too, remember that. Lots of fuel and low compression = sluggish and shitty idle...

Tunning is the key to all problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">dude.. did you pull your plugs yet or what??

what do they look like

thats the first thing you shoulda done.

as b16ahybrid said</TD></TR></TABLE>


we did this, plugs came out fine. No signs of running lean or rich on them.