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View Full Version : fuel problem i think ???


Tunabomber
09-28-2010, 05:21 PM
Jeep is up and running and was doing just aweshum untill this weekend

Any ideas were to look would be great


heres the problem its a weird one


with in the 1st 10 min of start up it seems to intermitantly bog out a bit

can be best discribed as if you were really low on gas and took a sharp corner
it bogs out for a sec and returns to normal after about 3 seconds

it has not stalled and only seems to happen in the lower rpm range


after driving for a 10 min the problem seems to go away


i did recently have the injectors and fuel rail off but all went back on smoothly and i have no leaks and good psi

also i replaced the fuel pump about 500k ago and the fuel filter about 5000 k ago

vacume lines seem ok


this sucks cause i wanna use the jeep but am worrried about being THAT GUY on the trail


im boggled here and no expert so any ideas would be appreciated :dontknow:



ps

91 yj 4.0 fuel inj

4skin
09-28-2010, 05:24 PM
and metal milissa wants a jeep[15] [15] [15] [15]
sounds like a temp sensor or vacume line plugged in wrong

Tinker
09-28-2010, 07:25 PM
Check your fuel pressure, regulator shot or not enough delivery ie:fuel pump? I'm good at changing them though, done 5 of em in my heep!

Moondog
09-28-2010, 07:36 PM
Whens the last time you replaced your gas cap?

Ironman
09-28-2010, 07:52 PM
Sounds like it's a problem with your shackles

dirka dave
09-28-2010, 08:23 PM
Sounds like it's a problem with your shackles


[15] [15] [15] :run away

Chopstick
09-28-2010, 10:20 PM
check your mass air flow line or your fuel regulator to see if your o rings are still there

are you sure that your fuel rail is actually sealed properly?

Metal Mulisha
09-29-2010, 10:47 AM
and metal milissa wants a jeep[15] [15] [15] [15]
sounds like a temp sensor or vacume line plugged in wrong

go fuck yourself

drooling starfish
10-17-2010, 09:17 PM
Get a code reader. Or find someone who has one. OBD 1 or 2? Sounds like o2 sensors are fucked. If so the ECM will try to adjust the air/fuel mixture for a while and just says FUCK THIS and switches to a default setting that will allow it to run. That switching over is your momentary bog. It will go through this cycle EVERY time you start up untill you replace the o2 sensors if that is the problem. It won't have quite as much power or run as smooth and your gas milage will go for a shit but it won't just quit on you. I drove an 86 Camaro like that for almost a year.

Tunabomber
10-17-2010, 09:19 PM
Get a code reader.



91 is a obd1


but turn the ignition on 5 times and count the flashes


i had 5 codes

all shared one thing in common

o2 sensor[16]

problem solved