I was sitting on my break in my 1999 JEEP XJ 4.0 having a smoke with it running for some heat, brrr its cold. It was on low fuel (like usual). All of the sudden it dies. I have power and the engine turns over strong. I put a gallon of gas. Still will just turn over. Check fuel pressure its good, and I can hear the pump. I did a tune up about 12k miles ago, new plugs, wires, cap, coil. I ahve heard it maybe the CPS but im not sure where its located on my vehicle. Can someone give me some advice Please???

 

Try putting more than a gallon of gas in it put around 15 to 20 dollars in it

 

i just went outside to start my 89 to go get some food an it wouldnt start but it cranked strong i have a half a tank in it an i have fuel at the fuel rail but it wont start up i should have spark i dont know why i wouldnt

 

Cps. Same thing happened to my 95XJ

 

where is the CPS on this year, near the bell housing???

 

Should be on driver side where bell housing mounts to the engine.

 

on top of bell housing it is hard to see without crawling underneath the jeep .Is your jeep auto or standard shift?

 

yup! sounds like a CPS...happened to me 2 weeks ago on the side of a highway. took about an hour to fix. Half hour to get the part and half hour to replace. you will need a long socket extension and a flex joint to reach the 2 bolts that holds the CPS in place from under the truck.

 

CHECK MINI fuses under hood theres one that powers the asd relay and down stream o2 sensor other momber have had issues with the wiring falling on exhaust/rear drive shaft causing no start issue ...jm2cw

 

replaced the CPS still not working, has fuel pressure cant see anything wrong with fuses so far, could it be ignition coil?? Replaced that like maybe a year ago (accel coil)???

 

Back to basics, verify fuel pressure(guage), spark (spark tester), scan for codes, this is a must before just throwing $$$ at it.

 

Don't have a scanner tool, is there a cheap one I can get??

 

ya i did mine today and i had to use two extensions with a swivel to get to it

 

I had my accel coil go bad maybe a year and a half after I put it in....I thought same thing that it had to be the CPS cause everything was new....replaced cps and still same problem....I had my stock coil still and swaped it in and it fired right up.....That was the second accel coil(two different vechicles) that I have had issues with.

 

Would be helpful to perform a quick spark test. Remove a plug, keep it attached to the plug wire, place the plug electrode near a good ground, have a buddy crank the engine while you watch. You are looking for a strong, BLUE, snapping spark. Yellow/orange/white indicates a weak spark which may not be strong enough to start the engine.

I'm not a fan of Accel coils as far as their "longevity" goes. OEM coil is really all the 4.0 engine needs for the majority of applicationis. Test your coil for primary and secondary resistances with a meter and a manual.