My 95 yj was having a few hiccups while driving on the highway it seamed as if it was missing, it was fine idling but hit high speeds and it missed. this morning it crapped out on me on the highway, so i got it towed back to my shop. i pulled the distributor cap off and the rotor. the cap and rotor looked in really rough shape so i got NAPA to get me new plugs, wires, cap and rotor put it all back together and she still wont fire! any suggestions?
Couple things Jeep girl. First things fist though: Love the Jeep collection!
Check for fuel and spark. Spark by pulling a wire and hold it near ground to see if it arc. Fuel by depressing the schrader valve on the fuel injector rail. Fuel should come shooting out of it. Check the codes. I just posted how on this thread at the bottom:
I'm leaning towards a fuel pum as you mentioned issues above idle. Fuel filter first, but be prepared for a pump. To diagnose you really need to check fuel pressure at the schraeder, not just see if it squirts...
Also check fuel pump connector at the tank area, fuse, and relay for fuel pump.
97 TJ Sport - 4.0/HP D30 w ARB/8.8 w LS/4.88s; 35s and flat fenders on 2.5 lift
84 CJ7; frame off restoration in progress.
The technical advice you get from me here is worth exactly what you paid me for it. Warranty issues will be reimbursed at double what you paid me for the advice.
Firing order is good and spark is excellent, I just checked the fuel on the intake and nothing is coming out so I am thinking it's a fuel pump. If I turn the key I should hear the fuel pump working?? Thanks everyone for the help.
Sounds about like the fuel pump - mine did the exact same thing when it went. FWIW those pumps need to have gas in the tank in order to keep cool. Mine fried because I tried to drive 30 miles home on 1/8 tank. Best bet if you get a new pump, is to always keep 1/2 tank of a good name brand gas in it.
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The cap I bought from NAPA had cylinder 1 off by 1 notch. My Jeep wouldn't fire at all. After lots of headscratching, I decided to start futzing with the firing order. Moved the plugs over 1 notch and she fired to life.
I had a similar problem with my 93. It actually turned out being the capacitors in the Pcm. I'd say check to see if your fuel pump.is getting power before you pull the tank and replace it. It'd be easy to test up at the relay in the fuse box. The caps are easy to replace if you know how to solder. There is a good write up about it on here too. Search pcm capaciters, or pcm fix.