P0190 code on Vortech '01 GT but running pig rich?

[Xcessiv]

Hi guys,

I recently installed a Vortech V2 on my '01 GT. Here is the combo:
- 99-04 Vortech V2 SQ
- AFM Powerpipe
- Focus High Volume Fuel Pump
- NGK TR6 Spark Plugs gapped at 0.030
- SCT-BA2400
- Bosch 42lb Injectors
- 96-03 4.6L GT 180° Thermostat.
- SCT-9400 - SCT Xcalibrator 2
- Accufab 75mm Plenum & Throttle body
- MAC Off-Road H-pipe
- Flowmaster cat back

While street tuning it for the first time @ WOT, a weird thing happened. I did around 7-8 runs in 3rd gear from 3000 to 6100 RPM, I kept running pig rich (below 10 until 5600 RPM, beetween 10 and 11.6 from 5600 RPM to 6100 RPM). The car obviously needs some tuning...

After these runs, I decided to give it a try in 2nd gear. Try #1, everything ok. Try #2, everything ok. Try #3, BAM! I totally lost control of the backend and the RPM started pegging @ 6000-6200 RPM. The check engine light immediately went on with a (P0190 - FUL RAIL PRS CIR ERR) code. I cleared it and went WOT again in 3rd gear, and everything was ok. Pig rich again, no check engine light.

What could cause this? Did the rolling burnout combined with pig rich conditions cause a fuel pressure instability? How could I run lean according to the code if my Wideband Commander logs display values beetween 10 and 11.6?

The sensor seems ok since I was unable to reproduce the code.

 

[hotmustang331]

Welcome to the club . My car sets it off all the time now! If you get into boost and fuel pressure goes way high and then you pedal it or let off....fuel pressure freaks out and will momentarily drop to around 10PSI and the catch again. Apparently that low of a pressure sends a fault code to the EEC and bam...code.
VERY first pass down the track 2 nights ago and my light came on. I just kept running it because I knew it just freeeked out on me...most likely durring the burnout.

Very first time it happened I went and bought a new fuel rail pressure sensor...as the old one was ofcourse original. The new one definatly helps to stabilize the fuel pressure, and it doesnt shoot around as badly under certain condidtions, but certain conditions will still set it off. Loss of traction while under boost seems to be the main thing.
So i would suggest you buy a new one so you know that the internals of the sensor are new and ok, and then just start clearing the codes.

 

[helty]

anything below.....32 psi I think trips that code.

 

[Xcessiv]

Welcome to the club . My car sets it off all the time now! If you get into boost and fuel pressure goes way high and then you pedal it or let off....fuel pressure freaks out and will momentarily drop to around 10PSI and the catch again. Apparently that low of a pressure sends a fault code to the EEC and bam...code.
VERY first pass down the track 2 nights ago and my light came on. I just kept running it because I knew it just freeeked out on me...most likely durring the burnout.

Very first time it happened I went and bought a new fuel rail pressure sensor...as the old one was ofcourse original. The new one definatly helps to stabilize the fuel pressure, and it doesnt shoot around as badly under certain condidtions, but certain conditions will still set it off. Loss of traction while under boost seems to be the main thing.
So i would suggest you buy a new one so you know that the internals of the sensor are new and ok, and then just start clearing the codes.

Nice. I feel better now. Thanks for the info!!!

 

[hotmustang331]

anything below.....32 psi I think trips that code.

Are you sure? My car idles @ 29-30 PSI . Do you have a fuel pressure gauge?