Anybody have an old cherokee that wouldn't start? Mine is an 89 and it cranks and cranks but wont turn over. I've been getting a lot of help and it is still stumping us lol. I have new spark plugs, wires, distributor cap button, crankshaft position sensor... still nothing...

 

did you resolve the starter problem?last I recall it was running good but your starter went out. When you say it cranks,but will not turn over do you mean it will not start?

 

are you getting fuel. I have an 88 what had that problem and i put a new fuel pump in it and it worked out.

 

Fuel pressure is 49 PSI. I put a new fuel pump relay and filter and the pressure is good. I pulled the fuel rail off and looked didn't see anything but i'm gonna try it again tomorrow and try to look deeper I didn't pay attention to the orings so I need to look again a the injectors. spark is great and fuel to the fuel rail is great gonna check the injectors again. I got a new starter relay gonna put that on in the morning. tryin this in the morning and we'll see....

 

I had six terrible injectors at one point and my Jeep lost a gallon of gas in the blink of an eye. I had to daily drive it for two days one point and I had frequent stops and it always fired up. I would think it would be the fuel pump probably.

 

I checked the injectors and orings everything looks good. I put bottles under the injectors and they all spray the same no leaks... 49 PSI at the fuel rail.

 

when you removed the plugs were they covered in fuel and black?

 

if you hav fuel... and you hve spark... then youve got bigger problem... try timing maybe... sensors like the CPS... or cam position sensor inside the distributor

 

also maybe a compression check?.....

 

wouldnt hurt... but i think it would still start... if it was a diesel that starts off compression then yeah...

 

had a porche at the shop i used to work at not start because of bad compression......only reason i sugg. it

 

Ya they were black...I just put on a new Ignition Control Module and still nothing...

 

how u check the compression on an 4.0?
I'm gonna try to get it to the mechanic shop if I can't find what the prob is in the nest couple of days lol this is costing me a lot of money

 

Here is a quick check,disconect your coil from distibutor,pull #1 plug,install compression tester,turn over at least 6 times,check pressure on guage. The proper way is to warm up engine,not available to you,disconnect coil wire,pull all plugs,disconnect injectors so you do not wash cylinder walls,screw in compression guage in #1 cylinder,hold throttle body open all the way and crank motor over 6 times,check pressure on guage,repeat this with all cylinders,you should have 120-150 on all cylinders,any variation of 30lbs or more is consider bad, If compression comes up slow place a little oil in cylinder,if the compression comes up further after this it is bad rings,if compression comes up and the just seops at a low pressure,say around 90lbs,and does not come up even after adding oil,it genaraly indicates bad valves.

 

Sweet thanks for the tip i'm gonna try that and i'll post what the findings are

Oh ya even after putting a new ICM nothing. Cranked more but nothing... New CPS, ICM, Spark Plugs, Wires, Distributor Cap, Button still nothing. Cranks and Cranks and Cranks and after like 3 or 4 cranks it bogs down and cranks again after a couple more it bogs down and just keeps doing it... had the battery tested and recharged and it's a good battery...