I have a big problem my xj won't start. I have no spark, I've replaced the coil, cap, rotor, pickup, still no spark and when you use the MM, voltage hits at 12 then hits and miss between 3 to 7 voltz while chankin. The voltage dose the same out of the computer next to the air box... Oh yeah the auto shut off and fuel pump realy are clinking away(extremly fast), and fuel is pooring into the return line. I thank I need a new computer, what do you thank?

 

Rarely the computer. Replacing the computer should be by a "diagnosis of exclusion", meaning that you should rule every other possibility OUT before suspecting the computer.

A very common cause of no spark is the "crankshaft position sensor". Located on the bellhousing. Without the input signal from the crank sensor to the computer, you will not have spark and you will not have fuel going TO the fuel injectors.

Here is a link to read that gives you more great information about this critical sensor.

http://www.jeepforum.com/forum/f11/c...ailing-639123/

 

What do I thank? I thank you.


And +1. And if it is the computer, junkyard computer = $20.

 

I used a mm to ohm out the crank sensor and it also was putting out juice. So I knocked it off my list of culprits. So that's why I think its my comp

 

1st off I can't spell at all never have been never will be able to. By the grace of god you only found one typo in that post.

2nd. Have you had this problem or are you going off of what I put on here to determain that its the comp?

 

Lmao.

And I going by what you listed as the symptoms, and what Tjwalker recommended and what I've gone through in my personal experience on Jeeps 1 thru 8.

 

Went to the junk yard got a new comp. Out of a very very clean 95, matched numbers every thing. Went to start up and still same problem....I'm honstly lost

 

Damn son, work = not being done.

Hmm, but the starters engaging and the motor is trying to turn over?

 

Yes it gets fuel and every thing sounds normal but no spark att all

 

Check your cam shaft sensor......and if not my guess maybe would be the cps. did u say u replaced the distributor coil. Use a test light or a volt meeter and start from the starrter. And check the ignition module, and the ignition switch

 

I'm done messing with it I'm selling it its a shame to cause. Have mtz on the jeep with less than 40 miles on them

 

NO WAY!?!?!?! dont give up on it!!!! just check your voltage going through the whole system starting from the starter. Its worth it. jeeps are tanks!

 

NVM not timing but a cold start issue so its a sensor issue since it starts at night but not in the morning like after it starts. there is a sensor that will keep it from starting when its cold but not when its hot. look into the sensor that does that. http://www.lunghd.com/Tech_Articles/...iagnostics.htm
sounds like a messed up 02 sensor

 

It turn off on me while runing

 

Sounds like the same damn problem I am having. I have power at the coil, and the coil wire will make a nice blue arc. But no spark at all coming from the distributor.