Mikeabrown64

OK so here it goes. 2004 Mustang gt V3 vortex super charger with a dyno (sniper tune). Started experiencing a idle draw.
Had a bad alternator changed it out went to a 150 AMP boch
Changed the spark plugs coils looked good gapped plugs .34 ish
Changed IAC
Check TPS set at 1.00 the .97 then .98 still dies
Pulled MAF was perfectly clean not a spec of dirt.
Took apart all vac hoses put them all back together nice a tight. Found no kinks or vac leaks
I'm reaching out for help on this because I'm stumped please help..

jwog666

what is your fuel pressure doing when it dies? you should monitor it to make sure it isnt dropping spec is (40psi+boost psi) while driving under acceleration(27-37psi) at idle with a steady reading, and 50-75 psi (key on engine off). does it die at an idle, or while cruising, under boost, etc.? your TPS V was fine to start, it has a range and all of your settings are in it and will not cause an intermittent stall due to closed throttle V.

Mikeabrown64

That was the next guess I'll let you know thanks

Mikeabrown64

Also trying to find the testing port on my 4.6 for the fuel pressure gauge. Any idea where it is

jwog666

if you have stock fuel rails its on the passenger side towards the front

Mikeabrown64

Do you know what the voltage should be reading on or about?

88 orangepeel notch

Welcome to the forum.

If your talking about voltage at the battery while idling, 13.2 - 14.3 ish.

jwog666

^^^^^+1

Mikeabrown64

I hooked up the fuel pressure gauge the psi stayed at 35 blip the throttle didn't get much of a response on the gauge. As fAR as when it dies out is only once it idles down it just dies out at random

Mikeabrown64

It the pressure flutters after it bogs down. Then it'll cut out and the pressure gauge reads 40 psi after it stalls out. I don't think it's the fuel pump what do you think?