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Jeep Grand Cherokee Maintenance and Repair

4608 messages,  Last post on Nov 30, 2009 at 11:06 PM

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#4317 of 4608 1998 jeep grand cherokee will not start by rbirm Nov 08, 2008 (11:09 am)
i have 98 jgc i get no fire from coil .i have changed coil ,tps sensor,map sensor,crank positin sensor,and main computer, still will not start...prior to this it would run but very rough and used the heck out of gas.i chaned everthing thats has come up on code reading...this s crazy Replies to this message: clipkarn (Nov 08, 2008 4:48 pm) rwengr (Nov 09, 2008 3:36 pm)
#4318 of 4608 1989 4.0 tranny cooler lines by tweiss Nov 08, 2008 (12:51 pm)
I installed new tranny cooler lines on my 1989 Jeep Cherokee Pioneer 4.0 liter. The new lines had slightly different pressure fitting ends than the old ones. There are 4 shiny metal tabs inside whereas the old had none and used a plastic collar and snapped onto a 2 tabbed larger collar. I attempted to install without the plastic but couldn't get a seal. I started the engine and tranny fluid seeped out of the pressure fitting. They don't seem to lock into place. What am I doing wrong and how do I fix it?
#4319 of 4608 Re: 1998 jeep grand cherokee will not start [rbirm] by clipkarn Nov 08, 2008 (4:48 pm)
Replying to: rbirm (Nov 08, 2008 11:09 am) Maybe the computer. But, have you got a battery harness you are proud of? If not, you may just not be getting the complete ground it takes for the 'puter to read the sensors correctly. About $135 will get you an OEM harness that connects the batt, the starter and the alternator plus applicable factory grounds. Made a big difference in my '97 reliability and eliminated some mystery behaviors.
#4320 of 4608 Re: 1998 jeep grand cherokee will not start [rbirm] by rwengr Nov 09, 2008 (3:36 pm)
Replying to: rbirm (Nov 08, 2008 11:09 am) I assume you hear the starter motor tying to start it when you turn the key.   I looked at my 97 shop manual. Maybe this info will help. The first thing they recommend is a test for spark at the coil.   1) Disconnect igniton coil secondar from center tower of distributor cap. Hold cable terminal approximately 1/2 in. from good engine ground.   2) Crank engine with starter and observe cable terminal for a steady arc. If steady arc does not occur, inspect the secondary coil cable. Also inspect distributor cap and rotor for cracks or burn marks. Repair as necessary. If steady arcing occurs, connect ignition coil calbe to distributor....(and then they discuss observing arc at ignition wires, etc.   If you really like the car try to buy a shop manual.   Some other thoughts.   1) You must be able to measure fuel pressure 2) Wiring/connectors between engine computer and ignition components? 3) What about the automatic shutdown relay ? 4) The Body Control Module (BCM) and engine computer must communicate to start. Replacing BCM requires reprogramming BCM or it won't start. Is there a similar issue when you replace the engine computer?   If you fix it, let us know what it was.
#4321 of 4608 2004 grand cherokee transfer case problems by chateaub Nov 16, 2008 (7:55 am)
My 2004 has become a nightmare to disengage part time 4wd (4 wheel hi). It is the select trac package with the 4.0 litter. Sometimes it takes a 1/2 mile or more of constantly pulsating the gas pedal to finally come out. I have tried backing up when this happens and sometimes it works and sometimes it does not. If you have to park and restart it will disengage with a fairly large bang. It does this especially on turns. I only shift with the vehicle moving with my foot off the gas, as I was told by the dealer that this is prefered. I am guessing this happens when the front axle is binding a little from being on dry pavement when the transfer case finally decides to disengage. When the vehicle was newer it did this once or twice, now it is constant. I have had the case and axle fluids changed at the proper maintenance schedule using factory fluids. It has 63k on it and is still in warranty. I am bringing it to the dealer this week and was hoping for any advise from other owners with similar problems so I know how to respond if the dealer tries to give me a song and dance. Any help would be greatly appreciated. Replies to this message: loosenut (Nov 16, 2008 8:01 pm) chateaub (Nov 17, 2008 3:56 pm)
#4322 of 4608 Oil Pressure Help by stetem Nov 16, 2008 (2:09 pm)
I have a 2000 grand cherokee laredo with 4l inline 6 cyl yesterday the oil pressure gage went to 0 and stayed there any ideas what my problem might be ? Replies to this message: loosenut (Nov 16, 2008 8:08 pm)
#4323 of 4608 Re: 2004 grand cherokee transfer case problems [chateaub] by loosenut Nov 16, 2008 (8:01 pm)
Replying to: chateaub (Nov 16, 2008 7:55 am) does your-04 have a vacm module on the front axle? check and clean the works on that,as that's how my -90 pioneer worked,and was told that's a standard axle for the cherokee..not shure if grand has that diffrent of a system,but would be worth looking at..maybee a weak or broken release spring,or a bad vacum diaphram or what have you..but it's gotta be there,as that's where the front axle is turned on and off..good luck! Replies to this message: chateaub (Nov 17, 2008 3:56 pm)
#4324 of 4608 Re: Oil Pressure Help [stetem] by loosenut Nov 16, 2008 (8:08 pm)
Replying to: stetem (Nov 16, 2008 2:09 pm) hopefully its either the oil pressure sensor in the block,or -less likely,the instrument cluster..might just be a wire came off,as the pressure switch wire is right next to the oil filter,and could've gotten unplugged..check around the filter for a unplugged wire..otherwise,you have no oil pressure,and have,or will soon blow up the motor..(just kidding--i hope!)..no "ratteling" noise outta the motor?,like it's still got pressure?..otherwise,worst case senario,put a "old school" mecanical pressure gauge in it.
#4325 of 4608 Re: 1999 JGC Limited - No all wheel drive!! [danond] by skiboy Nov 17, 2008 (5:11 am)
Replying to: danond (Feb 25, 2007 9:51 pm) Hi,     I know this is an old post, but I have the same problem! Works ok in 4 Lo, but no traction/engagement at front wheels in full time 4 Hi with Quadra Trac II. Anyone know of the fix for this?? Thanks!
#4326 of 4608 Re: 2004 grand cherokee transfer case problems [loosenut] by chateaub Nov 17, 2008 (3:56 pm)
Replying to: loosenut (Nov 16, 2008 8:01 pm) Thanks for the info. I will check with my local mechanic about the vac module. I want to make sure the dealer will warrentee as part of the drivetrain. I have talked to jeep service guy who owns the same truck. He said that sometimes his does not disengage right away so he stops and backs up and it comes right out. Mine does only sometimes no matter how far I back up.

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