Fuel System Problem

[1gDSM4g63]

I just got car back from a shop that played me all along after almost a year. It isn't running right. It stutter and dies after 3500+ rpm, white smoke, boost never build, and wideband is erratic not matter how I adjust the safc. Thought it was blown head gasket, but the compression for each cylinder is 150 lbs. However I did notice that the fuel pressure is not constant, it range from 30-42. And readings on my datalogger show the o2 sensor ranges from 0.01-0.82v and FTRL 125%. Do I to change the fuel filter or o2 sensor? Open to suggestion. Thanks.

 

[hopwoodp]

Did you notice any fuel leaks? Also, check to make sure that none of your vacuum lines are leaking either. I am not sure that a clogged fuel filter would cause the fluctuation your having.

 

[NATAS]

It seems like it's in the right range at leastthe o2 sensor reading. I mean it's lowish at first but climbs to a more respectable level. Maybe one of the vacuum lines off the FPR is unhooked? Fuel rail attachment? I doubt it's an injector problem. Possibly ECU? Mass air sensor? Sounds like you have a good old trial and error session coming up. Good luck with your car man.

 

[1gDSM4g63]

The fuel pressure shouldn't surge when the car isn't boost and there is no leak in the vacuum lines.