96_xj

So this weekend we went camping and it was a 60 mile drive to a 16 mile 6% climb up 4350 feet (final alt was near 9,000) Well nearly reaching the city i got pulled over as a "spot check" and when i went to start the jeep it stumbled and stumbled until i got going a little, i had to do a little fancy footwork and work with the gas/clutch to get it going....

it ran fine the next mile into town where we stopped at a gas station and when we went to restart it it did the same thing, stumbled and stumbled and if you gave it more air/gas it died.... pulled the intake tube off and when you would open the butterfly it would stop "sucking in" air and die...

Spark tested just fine!

fuel had plenty of pressure!

but when you gave it more air it died.

it would pulse/stumble on itself at like 150-250 rpms...

engine temp(aftermarket mechanical gauge) running: 205*

fuel pressure: about 50 psi

oil pressure(aftermarket mechanical gauge) running: 50-60psi

fuel pressure when stumbling: 48 psi

oil pressure when stumbling: 15-20psi


Finally got it up and running after many attempts... when it was running everything checked out perfect! plenty of power, no issues, and drove just perfect! and it has been fine ever since!


is there any reason this happened? btw i got no codes

00jeepXJ

Kinda sounds like when I would have a starter going out on me... but the whole part of you opening the throttle and it not continuing to pull air in is strange like you might have vacuum leak.

96_xj

hmmm kinda sounds like a vacuum leak huh? just would think it would continue to do so, specially after bouncing it around on OLD logging roads all weekend...


but its not the started it starts right up with barely a turn of the key (1000 amp starter)