random choke/sputter
#1
random choke/sputter
98 blazer 4wd auto (US) here.
while driving at random moments (speed/rpm/load irrelevant) it will seem like it missing fuel n choking it self for a split sec i release the gas pedal it comes back. had one bad enough at 70+ mph that it threw the tach and dummy light came on for 2 sec then came back online. thought bad fuel but im pretty religious on premium fuel at reliable retailers, and usage tech-ron or sea foam.
had a EVAP code pop after car wash about 1000 miles ago but that went away.
no codes currently
new (rebuilt motor) 17k ago/october16
new plugs/wire.cap,rotor, fuel filter(now K&N) with the motor swap.
my first thought is change the Filter again but is it that likely to clog that soon?
Thanks
while driving at random moments (speed/rpm/load irrelevant) it will seem like it missing fuel n choking it self for a split sec i release the gas pedal it comes back. had one bad enough at 70+ mph that it threw the tach and dummy light came on for 2 sec then came back online. thought bad fuel but im pretty religious on premium fuel at reliable retailers, and usage tech-ron or sea foam.
had a EVAP code pop after car wash about 1000 miles ago but that went away.
no codes currently
new (rebuilt motor) 17k ago/october16
new plugs/wire.cap,rotor, fuel filter(now K&N) with the motor swap.
my first thought is change the Filter again but is it that likely to clog that soon?
Thanks
#3
#5
so i tested the both about 11 mins
rail started @ 60psi ended at 40 out of spec
the tank/filter started at 79 ended at 62. with in limits but This seemed to be on the low side of the scale. is this a concern?
which leads me to believe its the FPR.
additionally, Is there a way to check injectors that might be stuck open allowing fuel to dribble? while im in there replacing a FPR?
besides having all the fun of pulling plugs?
rail started @ 60psi ended at 40 out of spec
the tank/filter started at 79 ended at 62. with in limits but This seemed to be on the low side of the scale. is this a concern?
which leads me to believe its the FPR.
additionally, Is there a way to check injectors that might be stuck open allowing fuel to dribble? while im in there replacing a FPR?
besides having all the fun of pulling plugs?
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dlboyd
1st Generation S-series (1983-1994) Tech
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12-03-2009 11:09 PM