I can't get my 1987 cherokee to start
 

I have fuel and spark but won't start my injectors won't work I replaced the ECM and still nothing

I can't get my 1987 cherokee to start
 

When you turn the key forward you hear the fuel pump prime?

What is your fuel pressure at the rail?

I can't get my 1987 cherokee to start
 

The reason I ask is because you stated that you "have fuel", but then go on to say that the injectors aren't working.

I'm just wondering how you came to that conclusion.

I thought the same thing.



OP. have u started doing the Cruiser's tips yet?

The ECM is the LAST thing I would replace.
Click on the link below and do Tips 1 through 5.

I relieved the pressure at the rail and tested the power to the injectors and there is no power

The fuel pump is working cuz I have it on a switch

You probably won't get a lot of help unless you post a lot more information. There are hundred of "Jeep won't start/run" postings. Need to know what engine, what you've tried (new battery, new spark plugs, new wires etc, does it crank, do the gauges work, did it run before and it just stopped starting today, have you had it for 10 years and it just started or did you just pick up from buddy who couldn't get it to run either. Was it from a scrap yard, was in a flood, fire, upside down etc.


This isn't the psychic friends network LOL. Start with the basics. Need to know fuel pressure first. Fuel at the rail doesn't tell much. Go and borrow a gauge.

I can't get my 1987 cherokee to start
 

Oh my.

Sounds like this thing may have some electrical issues. Gonna have to defer to Mr. Cruiser and his plethora of fine tips.

I have the 4.0 and and I have put new plugs and wires cap and rotter, coil all new relays, ECM , ignition switch , fuel pump map sensor, fuel presser regulator, crank position sensor and throttle position sensor and I still can't get it to start

That's what I'm thinking my next step is to trace the wires back to the plug and see if I have power to that and if not trace it back to the ECM and replace that wire and see if that will be the trick

I can't get my 1987 cherokee to start
 

How did you test the power at the injectors? Just curious.

With a test light I took the plug off and put the test light to both ends as my friend cranked it over and it never light up I did it to all 6 and no power and yes I tested my ground before I check them to make sure it was good

That all sounds good but did it start before you did all of that work? If you replaced the ignition switch and then it didn't work, we would start at that point. What was it doing before you starting putting all the parts in. Were you just putting new stuff in or what?


We need the lead up story like A) "I was driving my daily driver to work one day, turned it off and it wouldn't start back up. It had been running fine until then". or B) "I picked up this truck from a guy and he didn't know how to fix it, it wouldn't run and it's brand new to me". That kind of thing.

did you check the neutral safety switch ?