Can anyone give me some pointers on how to troubleshoot a fuel pump that might be going out? My car is running super lean and injectors are not trying to dump bunch of fuel. Is there something I can datalog via Cobb that would indicate if fuel pump is the culprit?

I also suspect the MAF sensor which I'll be able to rule that out later tonight but what are the typical MAF reading ranges in g/s? I'm only getting well under 300 at WOT which seem very low. This is the main reason I suspect my MAF sensor might not be functioning properly.

 

in my experience, about the most "warning" one ever gets from a FP about to go might be a start or two with some "sputtering". since its *usually* the fuel line connected to the pump that ruptures, it doesn't give much more notice than that. it will then ( usually ) start and then die the moment one presses throttle.

 

on boost it will sputter and you will pick up massive misfires. unplug the hardness on the hat and look for melted connections... its 4 screws away from looking...
maf on boost should read about 1100kg/h in rd gear...
you can disconnect the maf and run it that way...
your tuner can help you if you send the right data logs.. at least they be able to do basic diagnosis... this is not that hard to figure out...
good luck.
markski

 

Car definitely is not sputtering. Runs great actually on boost. I'll check out the connections.

I'll unplug the maf or have one of my local friends swap out the sensor.

I'm reading around 263g/s at 107 load around 6500rpm. On that pull lamba was crazy, 16.9.... that cannot be correct. All other pulled lamba is still high (12.2-13.5) but not that bad.

Injection time was 110 and STFL was stuck at 1. All other times STFL is around 1.23.

 

Turned out to be a faulty MAF sensor.