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1990 cherokee problems

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Old Feb 19, 2010 | 11:33 AM
  #16  
cherokee77's Avatar
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From: so cal
Year: 1990
Model: Cherokee
Engine: 4.0
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The egr is brand new. How do I check the module and the coil? I have a multi meter.
Thankyou so much for your help.
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Old Feb 19, 2010 | 11:45 AM
  #17  
Abovetimberline's Avatar
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From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
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The egr maybe brand new but is it hooked up right and does the solenoid work?
To check the coil and icm you need to check the resistance,It is fairly easy but you need a good manual so you know which terminals to check.
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Old Feb 19, 2010 | 11:50 AM
  #18  
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From: 9000 ft, CO
Year: 1999 XJ
Model: Cherokee
Engine: I6 4.0L
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Take a look at your spark plugs. They can be a good indicator of what's going on in the cylinders. Your oil's not milky is it?
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Old Feb 19, 2010 | 12:51 PM
  #19  
firstime00XJ's Avatar
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From: MI
Year: 2000
Model: Cherokee
Engine: 4.0 I6
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Just remember you need three things for a motor to run: Fuel, spark and air. To me, it sounds more like a spark issue. I would start with a tune up (which if one hasn't been done in a while, it should be anyway) and start there. Check the distributor, plugs, wires, check for arching, etc. Good luck and keep us posted.
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Old Feb 19, 2010 | 02:09 PM
  #20  
rdeskater's Avatar
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From: Sullivan County NY
Year: 1994
Model: Cherokee
Engine: 4.0 High Output
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check the timing. I had an 88 ranger throw the timing belt I replaced it myself, it idled beautiful reved up like crap. advanced the distributor and adjusted the timing belt again and ran great after. just my .02
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Old Feb 19, 2010 | 05:09 PM
  #21  
cherokee77's Avatar
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From: so cal
Year: 1990
Model: Cherokee
Engine: 4.0
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Ok this is what I am down to, If I take the return line off the regulater with the motor running I get no fuel coming out what so ever.

So I think it is the fuel pump.
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Old Feb 19, 2010 | 11:23 PM
  #22  
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From: so cal
Year: 1990
Model: Cherokee
Engine: 4.0
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Ok think I figured it out, had my wife push on brakes while I rev under hood with intake boot off. I spray carb cleaner in and it runs awesome and wants to go.

So I almost positive it is fuel pump.
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Old Feb 20, 2010 | 10:19 AM
  #23  
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From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
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Get a fuel pressure guage and check it,also check everything from pump to fuel regulatoe before you replace everything,like I said before mine was just the hose from the pump that came loose.
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Old Feb 20, 2010 | 10:27 AM
  #24  
mike albo's Avatar
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From: Loomis,California
Year: 1987
Model: Cherokee
Engine: 242 inline six
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What about IAC,or map sensor,on mine the distributor was bad also.
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Old Feb 20, 2010 | 01:56 PM
  #25  
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From: so cal
Year: 1990
Model: Cherokee
Engine: 4.0
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Well I fixed it it was the rubber line in the tank, I wasnt off but it was loose.
She runs good now except the tranny wont shift till 4500 rpm no matter what I do. The night I brought it home it shifted fine.
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Old Feb 20, 2010 | 06:46 PM
  #26  
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From: MI
Year: 2000
Model: Cherokee
Engine: 4.0 I6
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A few other people have had this issue with the resolution being a new throttle position sensor...I can't recall if that is something you've replaced or not. (as I'm using the 'quick reply' feature.) Good luck and let us know what you find!
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Old Feb 20, 2010 | 10:22 PM
  #27  
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Dwd
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From: Redmond OR.
Model: Cherokee
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here is a link to help with sensors i have used it alot there is a lot of other good stuff here to http://www.lunghd.com/Tech_Articles/...iagnostics.htm
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Old Feb 21, 2010 | 11:19 AM
  #28  
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From: so cal
Year: 1990
Model: Cherokee
Engine: 4.0
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Im thinking tps, I was getting 4.0 volts out now I am only getting 1.3 volts.
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Old Feb 21, 2010 | 01:47 PM
  #29  
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From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
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Change the tps if it is not 0-4.5 consistently,very common problem for tps to cause this problem.
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Old Feb 21, 2010 | 08:13 PM
  #30  
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From: so cal
Year: 1990
Model: Cherokee
Engine: 4.0
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Tranny is fixed I washed the motor and blew a fuse replaced the fuse and it drives and shifts great.

Thanks for all the help everyone, I am happy with the jeep now, I was about to run it off a cliff, but all is well now.
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