Hi/lo fuel pressures all the time.

[Mosbey]

Hello,
I have a speed6 with the following mods: STOCK TURBO .VTCS delete (flaps and shaft removed),stock intake opened where restricted,EGR delete/homemade catch can,XS POWER HEADER,3in catlessDP,to stock exhaust,AUTOTEC fuel pump guts ,3.5 in MM FMIC,cobb turbo INLET and SF intake.Stock BOV

I had an issue way back diluting the oil and really rough running so I changed injectors with cleaned /tested ones the car ran fine but not in boost would go to nothing with random misfire cel. Oil dilution was fixed. Car ran excellent off boost again (no boost leak) but would go lean when accellerating please see logs . Cleaned HPFP checked autotec internals , car would run good again off boost but it progressively get worse again when accellerating would see fp drop then random misfire replaced relief valve (new one) I drove couple more times .Last start car now runs terrible with very high fuel press all the time please see idle log .I don't think Im diluting the oil now just fuel press leally high . On initial start (When cold), the car seems to run smooth, idling fine. After approx. 30 seconds or with any throttle the car runs rough and pressures jump.

I'm at a loss... Any suggestions?

 

[L337TurboZ]

When was the last time you replaced and gapped the plugs

 

[Mosbey]

Its been a while since I changed plugs,I am going to try that, it can't hurt .Seemed like a lack of fuel but viewing the log everything seemed to happen at the same time? I have a couple used fuel rail fuel press transducers any one hear of those failing? Also is it possible to have 60psi at the HPFP seen thru V2 Cobb and no volume flow? I removed the filter in the double fitting low press port on the pump no change. It sounds like the pump makes more noise than before. Will it damage anything unplugging the spill valve while running? Thanks in advance Mosbey

 

[Mosbey]

SOLVED. I was overwhelmed focusing on high fuel press at idle and above ! Back to basics and found no change when one coil removed (no fuel) causing misfire and fuel press increase . Found fuel injector drive module with dissimilar metal corrosion from mount bracket and aluminum case interference, aluminum was corroded bad enough to open the split line and ruin module . Replaced module now fixed. Mosbey