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  1. TJ Technical Discussion
    2001 4.0 Auto Recently replaced the fuel sending unit (2nd time) due to long/multiple cranks. After I replaced the old pump (only pushing 30psi) and pressure was (40 key on) to 0 in 2 seconds. the new pump tested 50-60 psi (prime pressure) at start up then drops to 0 in about 5 seconds...
  2. YJ Technical Discussion
    Hi all, First time posting on the forum but figured I would give it a shot. I have a 93 Jeep YJ 4.0 and have been doing quite a lot of work to it but recently after I just replaced the clutch I have been having a lot of issues with the engine bogging down once I hit the gas like when I am...
  3. TJ Technical Discussion
    Need help here!! My 2002 Jeep TJ will not start I checked All Fuses and relays Got 40 psi at the fuel rail Installed a new Crankshaft position sensor Cranks over strong every couple seconds tries to fire after turning over 10 seconds check gauge light comes on when I urn on ignition...
  4. YJ Technical Discussion
    I'm dying over here! So here's the scoop: I've been having fuel pressure problems. My jeep would sometimes begin to stall when any throttle was put into it. Sometimes it wouldn't start at all. Sometimes it runs no problem. But recently it's been not firing after turning over so I rented a fuel...
  5. YJ Technical Discussion
    1989 Wrangler 2.5L standard. So it's single point injection and doesn't throw codes. I got water in the tank putting a new fuel pump in. Had the gas sitting in gas cans for a few days which probably is why. anyways, that made it stall out and not start back up. Replaced the plugs, fuel filter...
  6. TJ Technical Discussion
    Hey Forum! So I've been boggling over this for WEEKS knowing that my symptoms could be a number of things :pullinghair:, but tonight I think I finally figured it out. I always thought it was the fuel pump, but I was hoping in the back of my head that it was something cheaper. Instead of having...
  7. YJ Technical Discussion
    How it all started: Driving down the road, minding my own business.... and *BAM*!! Something sounded like it "let loose" and my jeep sounded like a lawn mower. Checked under the hood... A spark plug blew. Detached the electric to the cylinder to get it 2 miles so I could pull over and change it...
  8. TJ Technical Discussion
    So I've been experiencing the thing where the engine has to turn over a few times in order for the car to do a cold start. If I turn the key to the on position first and let the fuel pressure build, then the car starts right up. The entire time I thought that it was just my fuel pressure...
  9. YJ Technical Discussion
    I have a 1991 Jeep Wrangler 4cycl. I am having problems getting it to start. The engine does turn over. I change out the fuel pump and bought a new battery. I also checked the sparks plugs and wires, all have spark. I sprayed started fluid in the carburator, it does start but kills. Any ideas...
  10. TJ General Discussion
    2000 Wrangler, 4.0 .... plugs,wires,intake, throttle body all good (NO ENGINE LIGHT). Hard starting; go from "start" (failed attempt) to "on" then back to start, fires right up. Once a week or so, stalls at idle and shuts down .... cold or hot. Starts right back up. Fuel pressure at manifold...
  11. YJ Technical Discussion
    I have a 92 4.0L YJ that has totally baffled me. Well about 4 days ago I lost all fuel pressure to the fuel rail. So I dropped the tank and I found out that the PO had bent the skid plate, deforming the gas tank. So his solution was to get a new sending unit and bend it at a 45 degree angle so...
  12. TJ General Discussion
    Looking for answers, any ideas are appreciated... My 2004 TJ Sport has trouble starting when cold. It cranks a couple of times before turning over. After running for a bit, if i don't let it sit for too long, it starts up quick, no problems. It was throwing an engine light and a P0301 code...
  13. YJ Technical Discussion
    I own a 1987 YJ and I am experience fuel pressure problems. When I disconnect my fuel line going into my carb I am not pushing out fuel all the time. I disconnected my fuel pump and put the hose into a can of fuel to see if indeed it was pumping...it did. When I hooked the lines back up and...
  14. TJ General Discussion
    I'm new to this forum, but really hope the experienced members can help me out here. I have to prime the 2004 LJ 3 times to charge the fuel line before start. After some searching on this forum I have come up with a few causes for my hard to start LJ. Cause 1. The fuel check valve (either in...
  15. TJ Technical Discussion
    I will try to keep this short and to the point. I have a 97 TJ with 120K miles, 4 liter engine When cold it starts right away, when hot it will crank for ever with out starting. If I cycle the key off/ on several times it seems to build up pressure (I can hear the fuel pump cycle) and then...
  16. TJ Technical Discussion
    Hey.. I just checked my fuel pressure and it is rapidly fluctuating between 42 psi and 50 psi while it is idling. My repair manual says the pressure should be between 44 and 54 psi. Is the pressure supposed to be fluctuating, or is it supposed to be steady? Also, if it is supposed to be steady...
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