Car Won't Idle, Too much fuel

[TjPhillips36]

I have a 95 Talon TSi AWD that I have been working on for a while. We just started it up about a month ago, and it has been running fine just getting a few kinks here and their worked out but overall it been running great.

About a week ago however it started acting up, the car will run however it will not idle. It is getting entirely too much fuel when at idle and is just fouling the plugs out ultimately killing the engine. However if you start it and rev it a little ~2k RPM or any higher it runs perfectly fine.

The car has the following installed:
ARP Headstuds
Cometic Headgasket
Evo3 16G running wastegate pressure ~10lbs
Autometer 30-0-30 Boost Gauge

I have checked/swapped out the following with known good sensors:
O2 Sensor (Front)
Coolant Temperature Sensor
MAS
Crank Angle
Cam Angle
Boost leak test held 20lbs
Compression 175 across all 4

I'm ultimately dumbfounded as to what else it could possibly be, the car ran fine then just started acting up and fouling the plugs at idle with just way too much fuel.

Thanks

 

[8urwrx]

Dont know if this applies to a 2g or not but on the throttle body there is a wire that sometimes breaks off or just gets knocked off while working around it. It lets the ECU know that the throttle is shut. On my 1g it was broken off and it would die out at idle like that.

 

[TjPhillips36]

Well this isn't just at idle, this was happening when cruising it would start bucking then slowly die out. The problem was intermittent at first however gradually got worse over a week to the point where the car will barely run and is not drive-able.

Anybody else willing to toss out any ideas? I'm desperate for help, and have tried almost anything I can think of.

ECU was switched with another and the car ran the exact same way. It will barely even start now. Please help!

 

[boostngsx]

its not in your profile or posted on the thread, so im gonna assume your fuel pump and FPR is stock. Maybe fuel pressure is off.

 

[xtreme-elements]

i would check your fpr

 

[TjPhillips36]

Fuel pressure regulator has been switched with 2 units that were believed to work fine. I'm still researching an effective way to check fuel pressure, and I'll research if their is a way to check how the fuel pressure regulator is operating correctly. Thanks!

Car is completely stock besides a Evo 3 16G running off wastegate boost.

 

[poonman]

The first thing i think you should try is start the car let it warm up and touch the EGR line and see if its hot, i had the same problem and then realized it was my EGR stuck wide open.(providing you still have your EGR). If thats not the problem I would recheck my O2 sensors, i had an issue with this myself were my o2 acually cracked somehow and i was driving down the street and the thing blew out of my header.

 

[TjPhillips36]

EGR removed, along with any and all other unnecessary vacuum lines. O2 sensor has been checked/tested and swapped several times with known good ones. The car wont run enough to let it warm up.

 

[boostngsx]

If you replaced the fpr with two working units and still have the same issue, it could be your fuel pump is bad.

 

[91tizzy]

do you have logger? My suggestion is to see what fuel pressure the motor is seeing at idle....

 

[xtreme-elements]

did you check ecu could be bad caps too?

 

[mustangjoey]

i have a 96 gst that is doing the same thing i get codes p0100 p0105 p0110, i replaced the mas sensor had the same problem,replaced the ecu the car ran great for about 5 minutes and then it stated to do the same thing, any buddy have any idea's

 

[TjPhillips36]

Fuel pump is going to be swapped next, along with buying a decent regulator with a gauge. I have a 255 waiting to go in, but need to save up some money for a regulator, injectors, logger, and SAFC, or DSMlink.

I don't have any sort of logger, and I don't know of anybody local that has one.

ECU has been switched twice with ECU's that ran fine in 2G DSM's. I tried another 95, and a 97+ style with switching the plug wires around and neither did anything to change it.

I'm thinking it's fuel pressure related, however I don't have any tool or logger to help with that yet.

Thanks for all the ideas, keep 'em coming because I am about out.