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The transmission interacts with the engine (controls, sensors, etc.). Look for problems here. Their repair cost is low compared to transmission repair. Check the fluid level HOT. Low fluid can cause all kinds of symptoms. I made this mistake once. Good Luck
"A faulty TPS can cause driveability problems such as hesitation, stalling, an erratic idle, pinging (spark knock), no torque converter lockup, hard starting, an intermittent check engine light while driving, poor fuel economy, and generally poor engine performance."
I would also add "random transmission slipping" and weird shifting patterns as well.
I had a previous experience earlier this year where my TPS was affecting shifting and engine performance on my 98 Cherokee with 198,000 miles. Replacing the TPS only "fixed" it about 2 days. In the end, it wasn't the TPS, but the female connector plug going to the TPS. The weight of the wire harness on the connector had weakened the grip of the connector (female) prongs. Only after I disassembled it and squeezed the prongs tighter did it work. Initially I thought I was dealing with a broken wire, because moving the wire harness would make it act up, only to find out later the connector itself was the culprit.
Today I found a plug inside that was mentioned in that link which is for the tranny and to me it looks fine but i'll have to have my brother look at the reading. Tomarrow when I drive it to school I'm going to see what codes come on the scanner, i had some MAP sensors that were from some GM cars which is what is used on some jeeps, and i'm going to see if the MAP code goes away.
I also will take that TPS plug apart again and make the female end tighter.
Thank you this is alot of help!
One thing I was unaware of while looking at the Transmission manual, was how close the adjustment on the Throttle Valve cable is supposed to be. If this applies to your vehicle (if you're not aware of it), look at page 21 - 6 in the manual, They want it "within 1 mm (0.039 in.) in either direction" . The total tolerance they allow you is a hair over 1/16" of an inch! I wasn't used to Throttle Cable adjustments using tolerances that close. On a previous GM vehicle I had, they said to push the cable back into the bracket, then push on the accelerator to the floor bringing it back out and resetting it. I know using this method I wasn't getting tolerances they call for in the transmission manual here. The 42RE Tranny manual shows the
adjustment on page 21 - 44.
Let us know if you discover anything more.
Also have scanner hooked up to see the codes, or like on my 95 jeep you switch the key on an off three times leaving the key on at last turn(not starting), then wait for the check engine light to flash. The light will flash codes like one flash, pause, two flashes, pause would equal 12. This will tell you what to look for. This might not work for all vehicle. Good luck!
What engine work did you do because there's alot of things that factor into the tranny. let me know what you find, if find somthing i'll let you know good luck!
I read an article you posted the 42RE about a default mode on the TCM, which is 3rd but manual shifting is possible, and that modes from a fault code, what does this mean, there a way to reset this TCM? Thank you!
--after re-soldering mt headlight switch,my headlights don't blink on and off like the alarm has tripped..it works fine now..
--my best advice is to get a tube of DIELECTRIC GREASE-available from electrical supply places,then anytime you unplug ANYTHING-give the connection a good coat of that non-conductive grease..at least it will slow the contact corosion problem these trucks seem to be plauged with--even when you change a bulb !
p.s..
people--PLEASW CHECK YOUR TAILIGHTS AND BRAKE LIGHTS!..this annoys the hell outta me when people don't seem to care if their lights work ! the simplest way is to see your reflection in a store window !..might keep someone from hitting you!
to keep the break pedal down to check brake lights-i use a hammer weged between the pedal and the front of the seat !but don't leave them on too long,as they get hot !..makes changing them harder.. :sick:
and it will not shift to 3rd or 4th unless i start driving with the shift is on 2 and when i aproch a highway i shift it to D and OD then it runs smoothly , it used to do that once in a while but now it does it everyday , took it to the mechanic he said rebuilt or change the transmission which i will not do and prefer to sell the car instead if couldnt fix the problem , so please Help !!
The 42RE article about the default mode means if the TCM has a trouble code set, then it places the transmission in default mode as you described. On my 98 Cherokee, when I erase trouble codes with the scanner, it erases trouble codes in everything (engine computer and TCM). On my Jeep, I can only read the engine computer trouble codes, and not the TCM. I'm told I need a DRBII scanner to read those which the dealer has and is very expensive. I was surprised by some Jeeps with the 42RE, having the capability to read trouble codes of the TCM separate of the engine computer. I don't know if yours has an overdrive switch, but this is what the article described:
"This system has self-diagnostics. Fault codes can be read with a scan tool or by cycling the ignition key three times, then counting the flashes of the LED in the OD off switch."
Good luck and keep us posted on what you find.
My Jeep is a 95, with the OD off switch, which is before the OBD-II scanner connector, mines the OBD-I connector, there is one in the engine bay at the computer which we looked at and some codes were on that we caused, and then I found a plug inside for my TMC. The scanner we have reads the TMC and the computer, from that we got alot of readings, but I had no codes when I had the scanner in. Now with the flashes you said about I checked because I didn't have the scanner and I have TPS codes in both computers, this is after I wiggled the wiring harness a few days ago.
How do you know if it's in default mode, from the articles my symtoms would say but i'm not sure. I guess the scanner will reset this.
I knew the "guts" of the transmission was alright, because like yours, once I got it to drive it ran normally. Only when I came to a stop, it would not shift down to first unless I manually put it there (in order to take off again). So with nothing to loose, I bought a solenoid kit consisting of three solenoids off the web and installed them. To my surprise that's what my problem was.
If this is what you decide to do, look around at some of the transmission parts sites on the web for solenoids. The Jeep dealer wants an outrageous price for theirs. I got all three solenoids (the kit) off the web for LESS than the price of one from the Jeep dealer.
Do you think the TCM could have gone bad. I was reading about them and TCM tells the tranny when the best time to up shift and downshift, but there is only one shift solinod in that tranny which is for the OD and the rest I think is controled by shift valves. and the solinod is working because I have all gears.
I need to look at the engine again I ran out of time. I want to check wires to the TPS.
Thank You!
One thing I thought of and read somewhere, is make sure the ground strap from the engine (or tranny) to the frame is good, otherwise it will mess up all the electrical parts and make them act strangely. Especially after working with the head, there might have been one connected to it.
You're lucky you've got the tools and a brother who knows what he's doing. Best thing is, don't get discouraged because in the end I'm sure you're going to find it's only a wire or small component that's screwing things up. I've been there many times.
I'm still searching for other ideas.
My 97 jeep has a manual indicator which just shows you the position of the lever.
I assume you have a manual indicator. If you have LCD indicator on dash, I am not sure how they work, but in either case, the cable may be the issue.
A few electrical diagrams I found on the web show the Vehicle Speed Sensor sharing the same circuit (or wires) as some other sensors. All three of them end up back at the PCM. If that is a code you keep getting after repeatedly erasing it, and you've checked the wires and connections (I know some are hard to get at), you might consider replacing that sensor. It's a 50/50 chance this problem is related to the head gasket job, so it's possible a problem happening at this time might have been a coincidence. One thing for sure, it's definitely a part that would cause those symptoms.
I tried to check the fluid level and where the dip stick should be there is a cap that reads "For Dealer Use"
Can I get one at any auto parts store?
How much fluid does a grand cherokee take, the manual doesnt specify?
How much torque do I use when putting the pan back on?
Thanks in advance for your help