97 Cherokee 4.0

Has been driving not so good. Occasional sputters and jerking around at decent speed. Got it back from getting it inspected, drove it home and it would not start again.

Checked all the fuses, its blowing an o2 relay fuse again but I don't think that's the problem.

-It did have pressure in the rail now it doesn't seem to
-The electric fan is now always on when I turn the key.
-Appears to have no spark
-Can't hear the fuel pump turn on
-Gas gauge stopped working, battery gauge stopped working
-No codes, and instead of the key trick displaying 55 at the end of tests it just jumps straight to milage

This is absolutely puzzling me, I have no idea where to even begin. My first thought was the crank sensor since I bought one of off ebay, I figured it was a cheapie and burnt out, but I bought one from Advanced today and it didn't help anything.

 

You blow fuses for a reason. No fuel rail pressure cause the fuel pump isn't working. I'd start with the relay. Not sure if it would make the gauge inoperable.
It sound to me like you could have a couple of wires shorting out.

Appears to have no spark. Did you visually check or....?

BTW, welcome to CF.

 

Has a small crack in the exhaust manifold, which is what I'm assuming is making the fuse blow. Replaced both the sensors when O2 codes showed up and there has been no check light on since.

 

Wow, lotsa symptoms! Does anyone know where the ECM ground is?

 

Really considering just going the mechanic route

 

Wow, turns out it was the fuel pump fuse blowing and not the o2 sensor fuse. Any suggestions?

 

Earlier my 90 xj would die a second after starting. I was so angry because I just got it legal to drive. (Murphy's law) turned out I just forgot to re hook up one of the many grounds on the post by the four relays. Another time a Chrysler wouldn't start on me and I was stumped for over a week. Turned out a third small easy to miss vacuum line wasn't put back on the egr diaphragm. Point is both situations were incredibly easy to fix, but were incredibly problematic. Don't know if u had a previous mechanic or u yourself did some engine tinkering, But were all human and simple mistakes will be made. My advice is take a good look and see if anything seems out of place, then play with the ohm meter and so on. Or refresh your computer and re check what the codes say. Good luck. This post was to help u more than the jeep.

 

It was kind of dark when I was looking at it today but everything seemed okay. I'll definitely check grounds and vaccuum lines more thoroughly tomorrow. I don't have an OBDII reader, but doing the OBDI trick by flicking the key back and forth runs it through the dash tests and then rolls straight to the milage. Doesn't even show the '55' like it should.