alright, new here, and got one heck of a major problem for you guys.

right now im driving a 94 jeep wrangler 6cyl, 5spd and im about 90% certain the fuel pump is starting to take a permanent vacation on me. when i first got the jeep, i would lose the top end(about 4k up) after about 1.5-2.5 hours of driving. pull over, shut the jeep down, wait 5 mins or so, start it back up and be good for another couple hours. well, the other day i lost from 3k-3.5k up. now, normally i would only start losing RPM's when the engine was warm. but today, when i was pulling out of the dorms, the engine was about as cold as it could be, and i can only use up to about 2k. it just kinda bucks if i try to go over 2k. so am i crazy or is the fuel pump really leavin me?

ive had the jeep for about 2 weeks or so now. before i got it, the parents had the exhuast manifold replaced b/c it was cracked, and the cat. replaced cause it was clogged. they also changed the fluids. i think they replaced the o2 sensor also, but im not 100% positive about that.

hopefully, you guys can help me get this fixed soon. im heading home in about 3 weeks and dont want to make the entire 1100 mile journey at 50 mph.

you might wanna try a fuel filter first

Brian

Yep! Classic fuel filter... Listen to the Doc.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

i've had the same problems with mine only never so subtle, i've tried the fuel filter didnt fix it for me but deff worth the 10 dollars to try over the cost of a new fuel filter

It could be either fuel or exhaust related. How does the exhuast sound? The cat. could have re-plugged itself. Is the fuel pump noisy?

sunder, i could hear a humming sound from my rear end could that be another "clue" to the fuel pump?

They ALL hum.. The wife's plays a tune all day long.. Nope! Can not tell a thing by the tune it plays.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

If it's a new tune, a change in tune, or a whole new concert I'd be checking the pump. I've had that happen twice when the pump started making a NEW sound it died within a week. '86 and '88 Hondas.

You shouldn't be able to hear the fuel pump in the jeep with it idling. On some pumps that are of poor design, you might be able to hear them at idle, but definitely not at 5-10 MPH coasting. What you really need to do is get a gauge on it and check the pressure, anything else is a guess. To check for a plugged cat, you could drop the skid plate, and unbolt the cat next to the tranny and shove it out of the way and see if you have power again. If you do unbolt it, don't drive it for too long, the exhaust isn't supposed to be dumped out right there.

Sunder I have had several 4bangers that you could here on the highway! Couldn't get em to shut-up!
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />