02 front is 1v stuck high, just round off number, like this 0.9 is 1v. O2 stuck high right.
the ECU sees that and then sets trim fully lean MINUS MAX long term trim.
that is what the ECU does, its job is to trim fuel at all times not WOT. not cold, but yes, idle and yes, light easy cruising
the ECU stuck at max, NEGative trim, and the FPR reading wrong will over inject, the FPR range is 41psi to 21PSI end to end, and is never at 50 at any time.
ok?
the Fuel pressure varies from, 0 vacuum to 26"inches HG vacuum range, and 50 is not part of that SCOPE ever.
I made this curve to prove how the FPR works, at key on the spring opens the valve at 41 PSI, (the FSM even says that clear as day)
The variances keyon only, is only altitude.
the data is my 96 , 500'ft sealevel readings.
36 to 21PSI end to end, and 30 at idle
a savvy mech nows that 22 year old FPR just love to fail and some even stick as I play with my fancy $30 hand vacuum tool I can move the PSI fuel pressure to any point on that curve below, and if the valve sticks ,(can do) the pressure reads wrong.
you can test it or buy a new one for $60 your car your call your wallet and time. oK?
![[Image: reg-graph-mpi-g.jpg]](http://www.fixkick.com/INJECTORS/PUMP/reg-graph-mpi-g.jpg)
here is spec on car (FPR really) offiical spec, and is poorly done not showing altitude corrections (IMO)
the books also states " keyon pump turns on and the FPR opens at 41 PSI " clear as day.
my guess is the left side below 36PSI is at high altitudes.
I also know that newer FPR sold today are sold with newer tighter spec,'s by USA EPA rule sets)
96-98 16v FSM specifications Rail pressure: (pg.6E3-A-36-37)
Static: 36-43 PSI, keyon, not started ( you may have to key on 3 times to build enough pressure, pump runs on 3 seconds)
Running: 30-37 PSI , idling. (where does 40 fit in here, answer IT DOES NOT)
Residual : minimum 25 PSI , after 1min. drop test. (key off while running drop test)
no you tell me where 50 PSI reading fits in any part of the spec. (the answer is , it does not)
one more point on FPR, and WOT
at WOT (wide open throttle, there is no fuel trims O2 live corrections, it leaves closed loop.
so injection rates are only governed by MAF (air flow) and the FPR
did you know that?
your PFR is bad.
your return line is packed up.
your PUMP is 2 times illegal GPH rated and the shunt test skipped by you is, at 80-100psi not 55, oops wrong pump.
I'd for sure have stopped at 50PSI, and then did test to find true cause, for sure, but do ask .
if the shut test passed,
then id remove the return line , put hose there and other end to a bucket, OMG pressure is ok. now, and i find crushed metal return line right frame rear, omg,
the last guy was a WHEELER. max.
the ECU sees that and then sets trim fully lean MINUS MAX long term trim.
that is what the ECU does, its job is to trim fuel at all times not WOT. not cold, but yes, idle and yes, light easy cruising
the ECU stuck at max, NEGative trim, and the FPR reading wrong will over inject, the FPR range is 41psi to 21PSI end to end, and is never at 50 at any time.
ok?
the Fuel pressure varies from, 0 vacuum to 26"inches HG vacuum range, and 50 is not part of that SCOPE ever.
I made this curve to prove how the FPR works, at key on the spring opens the valve at 41 PSI, (the FSM even says that clear as day)
The variances keyon only, is only altitude.
the data is my 96 , 500'ft sealevel readings.
36 to 21PSI end to end, and 30 at idle
a savvy mech nows that 22 year old FPR just love to fail and some even stick as I play with my fancy $30 hand vacuum tool I can move the PSI fuel pressure to any point on that curve below, and if the valve sticks ,(can do) the pressure reads wrong.
you can test it or buy a new one for $60 your car your call your wallet and time. oK?
here is spec on car (FPR really) offiical spec, and is poorly done not showing altitude corrections (IMO)
the books also states " keyon pump turns on and the FPR opens at 41 PSI " clear as day.
my guess is the left side below 36PSI is at high altitudes.
I also know that newer FPR sold today are sold with newer tighter spec,'s by USA EPA rule sets)
96-98 16v FSM specifications Rail pressure: (pg.6E3-A-36-37)
Static: 36-43 PSI, keyon, not started ( you may have to key on 3 times to build enough pressure, pump runs on 3 seconds)
Running: 30-37 PSI , idling. (where does 40 fit in here, answer IT DOES NOT)
Residual : minimum 25 PSI , after 1min. drop test. (key off while running drop test)
no you tell me where 50 PSI reading fits in any part of the spec. (the answer is , it does not)
one more point on FPR, and WOT
at WOT (wide open throttle, there is no fuel trims O2 live corrections, it leaves closed loop.
so injection rates are only governed by MAF (air flow) and the FPR
did you know that?
your PFR is bad.
your return line is packed up.
your PUMP is 2 times illegal GPH rated and the shunt test skipped by you is, at 80-100psi not 55, oops wrong pump.
I'd for sure have stopped at 50PSI, and then did test to find true cause, for sure, but do ask .
if the shut test passed,
then id remove the return line , put hose there and other end to a bucket, OMG pressure is ok. now, and i find crushed metal return line right frame rear, omg,
the last guy was a WHEELER. max.
http://www.fixkick.com