89 Cherokee 4.0

[exotion]

So my jeep has some new problems and I'm having trouble figuring it out this time. So alternator went out and I replaced now probably unrelated the car barely idles maybe 150 rpm Sometimes stalls while I'm .looking in there. Lots of hesitation on acceleration no power and back fires randomly quietly inside the engine bay. I have replaced plugs wires cap and rotor cleaned distributor check everywhere for vacumn leaks ran heavy dose of seafoam through air intake to clean throttle body and chambers. I am thinking egr valve or tps but am tired of throwing money at it. Also thinking timing but don't have tools to test or fix that I know this is a lawn mower forum but I'm stuck and hopefully someone has something for me to try

 

[Carscw]

Ok so it was running fine then the alt went out. You replaced alt started the engine and it ran like crap?

Did you unplug something and not plug it back up?

Unplug the tps and see if it changes at all.
Unplug and clean every plug up.

 

[Carscw]

Does it backfire out the intake?

 

[exotion]

Does it backfire out the intake?

Sounds like it had the cat tested and its ok to

 

[Carscw]

As a rule popping out the intake is timing is off. Others things could be a bad valve a flat spot on the cam but would have started running bad over time.

I will assume you did not move the distributor.

I would retrace my steps and make sure everything is hooked tight and clean.

Then I would move the distributor and see what it does. Best way to time a engine is hold it at half throttle and turn the distributor until the engine runs smooth.

 

[exotion]

As a rule popping out the intake is timing is off. Others things could be a bad valve a flat spot on the cam but would have started running bad over time.

I will assume you did not move the distributor.

I would retrace my steps and make sure everything is hooked tight and clean.

Then I would move the distributor and see what it does. Best way to time a engine is hold it at half throttle and turn the distributor until the engine runs smooth.

I didn't move it I don't think I've never done timing before is sounds fine with me holding throttle at idle it doesn't can I do it at idle and how to I move it.?

 

[exotion]

Also this is a fuel injected model and my haynes doesn't say anything about moving the.distributor so I'm double blind lol

 

[Carscw]

Have you made sure everything is plugged in

 

[exotion]

Have you made sure everything is plugged in

Ya been over all the electrical nothings seems unplugged, I probably emptied 3 cans of carb cleaner looking for vac leaks

 

[Two-Stroke]

You could also look at all the small hoses (rubber tubing) that connect to the fuel system and the distributor. If those are original (1989) they could be rotten and touching them while you worked on the alt could have opened up a crack.

If you haven't touched the timing, I wouldn't mess with that until you exhaust other possibilities.

It also wouldn't hurt to sit down with the manual (I like Haynes -- have used them for years) and read the sections on the fuel system and the ignition. I'll bet the answer is in that book.

Is it really idling at 150 rpm? That seems so low.