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
#32 of 276 1990 Jeep Cherokee Limited - Problem
Oct 14, 2007 (6:14 am)
I have a 1990 Jeep Cherokee Limited with, what was thought to be a transmission problem - this was checked and there is nothing wrong with the transmission.
The vehicle starts after a lengthy crank time - sometimes idles very fast - sometimes normal. Once in gear and driving, the vehicle shifts from a lower gear to a higher gear, without any reason, then when coming to a stop the engine stalls, will turn over and start but again after a lengthy crank time.
I've been told that the computer needs to be replaced as the engine is not advancing properly - to take care of the crank, idle and stalling issues – (I cannot find a 1990 computer for this car – any ideas). But this shifting problem is very troublesome.
Any ideas on or experience with either of these problems and any advice would be greatly appreciated. Thanks.
#33 of 276 Re: 1990 Jeep Cherokee Limited - Problem [rachel6]
Oct 14, 2007 (2:58 pm)
change the tps first
#34 of 276 Re: 1990 Jeep Cherokee Limited - Problem [rachel6]
Oct 14, 2007 (3:57 pm)
There are several possibilities but let's hit the easy ones first:
All are common issues & you may have a combo of them.
Throttle Position Sensor, located on throttle body. Sends signal to ECU (computer) to control fuel injection, some tranny input. Relatively easy to replace and adjust but requires a $5 digital volt meter from Harbor Freight, etc to set the voltages correctly. (This is likely causing the wierd shifting issue.) These things go whacky too if the ground connection / connector is oxidized. Running a ground jumper wire helps that immensely. (As well as checking your engine's ground strap from rear,driver side of head to firewall)
Tranny kickdown cable, goes from throttle body to transmission & has an easy to do adjustment (no tools required) but I'd have to dig up my FSM (factory service manual) to give ya the details. I'll post a 'how to' article on my Jeep website as this is a fairly common question.
Idle Air Controller, located in throttle body regulates idle speed. Easy to remove, clean w/ carb cleaner & replace.
Vacuum leaks are EASY to check for: With the engine running 'rough' (when it's misbehaving) you can use a windex style bottle filled with water to squirt along the intake / exhaust manifold area where it bolts to the head. It is a fairly common occurance for the manifold bolts studs to loosen up over time. Do NOT overtighten these! The studs (front most & rear most) are especially prone to snapping off! Torque sequence is posted on my site.
Rather than post all the tiny details here - check out this page at my website for the throttle body & idle speed controller info.
Another Freakin' Jeep Cherokee Website - go to "On Site Tech" then "Engines" then "RENIX Sensors Diagnostics"
#36 of 276 2000 Cherokee Sport
Oct 17, 2007 (1:33 pm)
Driving my jeep on the back lawn and it just stalled. Towed it to the garage put more gas in it and it cranked and fired but wouldn't stay running. Now it won't fire at all!!!! It's my toy and hasn't been driven much lately.
#38 of 276 Jeep Cherokee Non Start
Oct 18, 2007 (11:02 am)
Hi, whilst driving today the 'check gueage' light came on, I pulled over and checked oil, water, etc and found nothing wrong. Went to restart and car wouldn't start, it was turning over but not 'catching'.
Called RAC and after checking everything thoroughly couldn't find the problem. His reprt said 'No initial fuel delivery, starts on easy-start. Fuel pump drawing 4a (ok).
So the car will start with carb cleaner sprayed down hose but will not restart when engine turned off.
Any ideas anyone???
#39 of 276 Re: 1990 Jeep Cherokee Limited - Problem [rachel6]
Oct 21, 2007 (9:21 am)
Erratic shifting in my 1990 Laredo was the EGR valve: more specifically, the EGR back-pressure transducer, which I think is only used in 89-90. It's attached to the EGR valve when you buy one, and it won't let a vacuum to the EGR valve unless there is sufficient exhaust back-pressure. The diaphragm in mine was worn out, but not completely shot, causing the EGR valve to flutter rapidly, and somehow causing erratic shifting between 2-3 and 3-4, especially under load. Try disconnecting the little, short, 90 deg tube beneath the EGR transducer, where exhaust backpressure comes from, then drive and see if one or more of your problems gets better.
#40 of 276 Re: 1990 Jeep Cherokee Won't Start No Spark [dkwalters128]
Oct 26, 2007 (4:40 pm)
I have a 93 cherokee it only starts if I leave the key on for a few minutes, something clicks then I turn key all the way it starts most of the time . I hav'nt found the problem yet though.
#41 of 276 1993 Cherokee wont start
Oct 26, 2007 (4:49 pm)
I have a 1993 grand cherokee.I get no power to the coil or fuel pump.If I leave the key in the on position for a few minutes something clicks, then I turn the key all the way, it starts. can anyone help? ,please!