Last post on Oct 29, 2013 at 2:17 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Cherokee, Transmission, SUV
#187 of 276 Re: 1990 Jeep cherokee stalling problem!! [loosescrew]
Jan 03, 2010 (8:59 pm)
Check harmonic balancer if your belt flew off - they're notorious for flying off kilter when the rubber inner 'liner' rots away. After that - check the water pump shaft for wobble along with the other pulleys & idler (if present).
CKS (crankshaft position sensor) isn't too bad to change once you've done it... first one I did, I supported the tranny crossmember w/ a floor jack & lowered the transmission crossmember (2 bolts & 2 studs) a couple of inches which gave me more room to get to the sensor. Just be careful not to snap a stud or bolt. They're metric if you end up having to replace them.
If you don't want to do that, go to Harbor Freight - you can get a set of wobble extensions. Borrow a few more extensions if you need to - you can feed them up to the CKS and remove it without lowering the tranny.
NAPA carries the CKS:
Part Number MPE CSS980SB ECH CSS980
Price 34.49 40.62
Believe it or not, you can do it from up top but it's a royal pita to do.
A quick check for the CKS when you stall out is to unplug it and replug it back in. Often, it will then start up. Reason being is the sensor is weak and when you unplug/replug you clean off a bit of the oxidation on the sensor connector allowing a slightly stronger signal to reach the computer. The computer depends on this (and camshaft position sensor) to determine top dead center (TDC) and a weak, or non-existant signal means the computer doesn't know when to fire the ignition.
As mentioned in the above post - poor grounds can be a major cause of problems. On the RENIX based Cherokees (non-HO, 1990 & earlier) the connectors were quite frankly garbage and oxidized due to moisture infiltration over time. A ground jumper from the Throttle Position Sensor (TPS) is a common fix for other issues. The ground strap from engine head to firewall (driver side) often breaks or is left off when an engine is serviced and results in all kinds of gremlins. I HIGHLY suggest you replace it with a generic battery eye-to-eye ground strap. I also added another ground strap and upgraded the battery charging cables (seriously undersized from the factory).
These engines are fairly bulletproof and will easily go 300k+ with decent maintenance.
I have a RENIX diagnostics page on my Jeep website: http://www.lunghd.com as well as contact info if you have further questions.
#188 of 276 98 Cherokee with Hot Start Problem
May 07, 2010 (8:38 am)
Hi ... I've inherited a 98 4.0 Cherokee from my father ... which when cold starts and runs like a dream ... but as soon as it gets hot, it will stall and refuses to start again until it cools down completely (about 90 minutes).
I've changes the plugs, checked the leads and coil, changes the battery ... but don't know what else to do.
I want to keep the car because it was my dads, but can't afford to spend much cash on it ... can anyone help.
#189 of 276 51 plate jeep grand cherokee problems cold/hot start cranks but wont fire !
May 21, 2010 (2:07 am)
Hi i have a 51 plate jeep grand cherokee V8 4.7 L petrol that has a few problems .
1. Car struggles to cold star it will turn over but just can't quite fire.After about 6 attempt the car will start
2. Once the car has started it runs rough and lumpy and will not rev .This rights itself and the car runs ok after about 30 seconds .
3. If i stop the car then try to re-start while it is hot the car will not start at all !!
We have tried new ECU etc coming to the end of our idears now please help !!
#191 of 276 96 cherokee country syalling
May 30, 2010 (6:19 am)
y 96 cherokee country has developed a intermittent stall issue. I have no idea what to do. It will do fine most of the time at hwy speeds, ocasionally will sputter a little,but when it is acting up the most I will be in stop and go traffic or idoling at a traffic light.The rpm's will jump high then drop almost to nothing and it will stall out and shut off. When this happens it will start back up and after I get moving has reved high and spitts and sputters but usally will clear up and go on, I just replaced the fuel pump and still have the same issue. Any ideas, I have been reading that it could be the crank sensor.
#193 of 276 jeep cherokee
Jun 04, 2010 (7:53 pm)
i have a 2001 grand cherokee that will not idle after warming up. is there a sensor bad and where is it located?
#194 of 276 Engine Hesitation
Jun 08, 2010 (10:26 am)
I have a 95' 4 banger cherokee. In the morning it runs great but after sitting in the sun all day it hesitate most of the drive home. It idles fine but has the issues when applying the gas. I changed the fuel filter, new plugs and wires, cap and roter, oil and filter. Basic matinace still can't figure it out. Any suggestions???
#195 of 276 Re: jeep cherokee [vader8]
Jun 08, 2010 (2:23 pm)
I have been having the same problem. 2000 Cherokee Sport. Ran fine till I decided to clean the IAC motor/valve, pretty carboned up. Since then it has been a pain. Runs OK cold, and at high RPMs. Once the engine gets warm and sits a bit, it wont idle. I am not sure what is going on. I bought a new one and it is a bit better, I have been using the new and old to try and determine if the original has gone bad.
#196 of 276 Re: jeep cherokee [bvisocky]
Jun 08, 2010 (3:40 pm)
try a new throttle positioning censer