Hey guys, i have a 1989 jeep cherokee xj 4.0 with a automatic. It just recently started bogging. It bogs as long as its not full throttle. It also feels like its misfiring randomly sometimes. Any ideas on where to start?

 

Yep.

Ever replaced the plugs, wires, cap and rotor?

Click on the link below and do posts 1 and 3 for starters.

 

^ x2

 

Nope haven't replaced them, it's got 180k miles and I've only had this one since 173k. But I'll check it out tomorrow and let y'all know what I find. Thanks.

 

Gotta start with basics.

 

That wasn't it, still misfires and all. It loads up on fuel and dies. I'm starting to think it's the fuel pressure regulator. Going to check the fuel pressure tomorrow or Thursday.

 

What "wasn't it"?

Loading up on fuel and dying is most likely MAP sensor issue. How's the hose/tube from the throttle body to the MAP? Is the MAP connector secure?

 

Ill check it out tomorrow in the daylight, the cap, rotor, plugs, wires didn't fix it or help it.

 

If you read posts 1 and 3 in my link, you would understand how critical those ground points are. Did you read them?

 

I can't see any link posted. I'm on here on my phone if that makes a difference.

 

It misfires and bogs anywhere over quarter throttle or under full throttle.

 

Get on a PC then.

 

im having the same problem with my 90 let me know if you find out whats causing it and ill let you know if i find anything

 

A pc? It's obd1

 

He is talking about how you communicate with him not to your Jeep ,tour jeep is a renix