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  #25  
Old 01-05-2012, 09:10 AM
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Re: Yet another Grand Cherokee Tranny Issue

Hé 02GrandHO, just looking at your avatar, this is hopefully not something you have in mind for your jeep, isnīt it................
You really have to love your jeep, mine also gave me more problems then all other cars i had owned before, but if you love it, you to take it as is..................

Regarding the set of 2 speed sensors and the line pressure sensor, have a look at the site of this company: www.electricaladvantage.com. I got in contact with Robert j Gaul, they respond very fast and also ship very fast. I ordered the sensor kit, together with the solenoid pack and filter kit. Unfortunately the filter kit was only holding the oval inlet filter and the pan gasket. Robert didnīt know that there are 2 filters inside the tranny, but he very nicely send me the round spin-on filter for free. Just received it yesterday.
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  #26  
Old 01-05-2012, 11:31 PM
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Re: Yet another Grand Cherokee Tranny Issue

LOL I'd never do that to my baby! Just playing with the camera. Fire pretty!!! Ooooohhhh FIRE!!!!!!!! I hear ya about loving your Jeep. My 94 ZJ cost me a pretty penny in repairs and when she popped a head gasket I decided I'd had enough and bought the WJ with plans to fix the ZJ and then sell her. But after I tore into the head gasket I knew I just couldn't part with her and ended up doing a partial rebuild. Now when it is all said and done she has Doug Thorley headers, Magnaflow Cat, Borla Catback (can you tell I hate rust?), BBK throttle body, Mopar Performance true roller timing chain, Flexilite electric fan conversion, new stearing gear, Borgeson intermediate steering shaft (Beefy!), power steering pump (broke the plastic tank fitting during removal. whoops!), Currie heavy duty tie rods/drag link (They are definitely heavy duty!), ball joints, track bar, Billet wire looms, Taylor 8.2mm Wires, MSD Coil and iridium plugs, Hotchkis sway bars, Rancho adjustable shocks (should have went with Old Man Emu), Powerslot Cryo brakes and of course a K&N cold air intake. What can I say she's quick and nimble for a SUV and I simply love the way it drives! It's a Jeep!!! Next up is a small (ie. 2") lift, ARB Bull bar, winch, lights, and tires/rims. I'd like to do a cam, lifters and roller rockers too, but I'll probably wait until she needs an overhaul and pull the engine and do it up right. Anybody know of a good aftermarket tuner for the 5.2 in a ZJ? I had a Jet stage 2 and it worked for about a year and then the thing started running terrible and I pulled it out. It runs fine now, but I know it could run better with a chip.

By the way, thanks everyone for all the help with the tranny issues. I ordered the speed sensors and pressure sensor from electricaladvantage and a TPS from rockauto. I figure they are not all that expensive when compared to what a transmission shop will charge just to look into the problem and even if it doesn't fix it, I'll know what to rule out when the tranny place ask what I've already tried.
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  #27  
Old 01-12-2012, 10:17 AM
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Re: Yet another Grand Cherokee Tranny Issue

Well, I'm bummed. I put in all the new sensors and the Jeep seems to perform better over all, but the main problem with the slipping when cold is still there. It might be a bit better, but it wasn't too cold out when I test drove it, so that may be part. I know the old TPS wasn't quite right because the instructions that came with the new clearly stated to only use one gasket. Either the O-ring or the flat gasket or else damage to the sensor may occur. The old TPS on my Jeep had both. I don't know if that really effected anything, but its done up the right way now. Also, when I did the line pressure sensor, I notice the end of the old sensor was bent at a slight angle, like it was jammed inb the hole wrong. I don't know if the new one is that way or not since I didn't examine the old one until I had everything back together. What can I say, it was cold (36degF) under my Jeep laying in my driveway and I didn't feel like crawling out to compare. Just Lazy I guess. Anyway, the speed sensors that I put in matched each other, while the old ones didn't. Don't know if it made any difference. I just assumed one was a cheapo Napa while the other was OEM. I might try a new set of filters and fluid just in case the dealer put the old style filter in there or in case there is something floating around that they didn't catch. I'll have to see if I can get into my dad's garage over the pit though. Like I said, I'm getting lazy. I'm still wondering what the growling noise is that I get under braking. It is most definitely coming from the transmission area just in front of the shift lever on the floor. That would be the torque convertor/flywheel area right? It sort of sounds like something is moving forward and rubbing on a gear or something. It changes pitch based on speed and how hard you brake. Maybe they left something loose???? Is it bossible the torque convertor could be moving? Ie. not seated right?? I'm hoping someone here has another idea??? You guys have been awesome so far and I really appreciate all the help! I'm guessing the next stop is the transmission place though. Well, after I save up some dough first.
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  #28  
Old 01-12-2012, 07:35 PM
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Re: Yet another Grand Cherokee Tranny Issue

If the sound is speed related, it shouldnīt be the torque converter, since it is bolted to the flexplate and depends on engine revolutions and not car speed. Or it must be something internally to the torque converter, since the transmission input drive shaft is driven by the torque converter turbine.
As a test, if you put the transmission in N before braking, do you hear any difference in the noise?
The slow engagement after first startup seems to have to do with a torque converter which is not full with fluid. If you decide to change the fluid/filters, have a look also to the cooler return filter bypass valve. I have never removed it, but it should be springloaded closed, otherwise the torque converter fluid will drain back after shutdown.
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  #29  
Old 01-19-2012, 11:31 PM
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Re: Yet another Grand Cherokee Tranny Issue

Well, since I did the speed sensors and the line pressure sensor the growl noise under braking seems to be gone. It's been pretty snowy around here lately, so no really hard braking, but under moderate braking it seems to be fixed. I'm not sure why that fixed it though? I've looked over all three sensors that I took out and they all seem fine and have no signs of rubbing. The only exception is the line sensor looks bent on the tip, but still no signs of wear or anything. It just looks like it was jammed in crooked or something.

As for the slow engagement when cold, I'm beginning to think it's a solenoid pack problem. The reason being is that if I shift into second instead of drive the transmission will engage properly. That would be solenoid pack right? I know the dealer changed it out, but I'm beginning to think I got a lemon or they pulled one over on me. It is definitly worse the colder it gets outside. The other morning it was 5 below zero and I didn't think it was going to move when I put it in drive. So I shifted into second, which worked, but grabbed pretty hard for some reason. I drove as long as I could in 2nd, but I had to go out on the highway. When I put it into drive the jeep acted like I had just put it into neutural and it took a couple of seconds to engage drive. I tried downshifting into 2nd again and then back into drive and each time it would act like I took it out of gear. The next time I pulled up to a stop, it lugged the Jeep down and died. After I restarted, the shifting was better, but it still wasn't acting quite like normal. I have also noticed that until the tranny warms up and I do the restart trick, it will not kick down when you plant your foot, even at speeds under 30mph.
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  #30  
Old 01-20-2012, 10:26 AM
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Re: Yet another Grand Cherokee Tranny Issue

He Corey, this is becoming a story without an end........................
That the jeep dies when coming to a stop, is a sign that the torque converter is not releasing for some reason. That can be the clutch or some other mechanical failure inside the converter. This at least should have nothing to do with the tranny itself. It also could have to do with the CC switch valve or the solenoid switch valve.
Do you know which color the connector of the solenoid pack has? Originally the connector is black(for jeeps until 2004), but this one is not made anymore. The newer versions are white and should be interchangeable. (i have this new type here, waiting to be installed, but this depends on time available and on the fact if i have to take the torque converter in for cleaning)
If they installed a black plug solenoid pack, its or a used one, or a refurbished one. When they installed this solenoid pack on the previous tranny, did you have the same problems?
Checking the hydraulic flow diagram, when selecting 2nd manual, no solenoids are energized, however when selecting manual low, the LR/CC and MS solenoids are energized.
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  #31  
Old 01-20-2012, 02:14 PM
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Re: Yet another Grand Cherokee Tranny Issue

Yeah, tell me about it. I thought for sure those sensors would fix it. I'm not sure on the connector coloring until I get the pan off in a warm garage. I seem to remember it being black the last time I was in there, but my memory isn't the greatest. Tranny number one had a constant slipping issue and the dealer said it wasn't engaging properly. So they replaced the solenoid pack. Didn't change anything, so they replaced tranny. Now that you mention it though, tranny number two did have issues with not shifting into overdrive as well as not downshifting under hard acceleration. I don't remember it slipping though. Tranny number three worked fine over the summer, but now it has these problems. The dealer is tied in with a Napa store, so I have no idea if the solenoid is OEM or not or if it was actually new like they said since they have a history of lying to me. I mean this is the same dealer that tried to tell me that slipping like this is normal and that I need to just set the parking brake and warm the Jeep up in neutural. They just recently lost their corporate ties with Dodge/Jeep and so I can't even call them a dealer anymore thankfully. Of course that leave the next closest dealer an hour away. I am confused by the way it works if I select 2nd gear instead of drive. That's why I thought solenoid or valve. What is the CC Switch valve you mentioned and where are they located? Can they be changed without dropping the tranny?
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  #32  
Old 01-20-2012, 03:03 PM
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Re: Yet another Grand Cherokee Tranny Issue

The CC switch valve is unfortunately inside the tranny. It is in fact inside the pump housing. It is the torque converter clutch valve.
The solenoid switch valve is inside the valve body. But you have now already tranny #3 and still similar problems. So it looks like that the problem itself is not the tranny itself. Maybe that the first tranny had a worn clutchpack and changing the solenoid pack will then not help anything. And if that solenoid pack was (is) bad, it only would confuse you even more. You donīt have to open the tranny to see the color of the connector, you probaly can see it when you are looking under the jeep on the left hand side, where the big connector is. But black or white, it can have a failure anyway. But to simply change the solenoid pack (again) without knowing that it for sure will solve your problem, could mean throwing more money away. I think that i paid 270 USD for mine, at electrical advantage. It also came with a new TRS selector plate.
Regarding the kickdown, attached the shift schedules, which shows that kickdown shifts are not available with cold fluid.
Attached Files
File Type: pdf shift schedules.pdf (29.9 KB, 7 views)
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  #33  
Old 01-20-2012, 11:39 PM
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Re: Yet another Grand Cherokee Tranny Issue

Hmm, kind of sounds like I'm down to two choices. 1. Cross my fingers and replace the solenoid pack again or 2. take it to a transmission shop and let them sort it out. I would just like to have this fixed once and for all and stop messing with it and stop burning my hard earned money. I think maybe I've passed the point of things I know how to change myself and need the help of someone with more experience.

Thanks for the shift schedule. That is good to know in the future. What I meant though was that the transmission will not kick down until you do a restart and only after it is fully warmed up. If you don't restart it will simply not kickdown no matter how long you drive and how warm the transmission is. Also, the transmission actually does feel like it is going into neutral when I manually shift from 2nd into drive. The engine RPM's actually go up like your reving the engine in neutral, especially if I'm not gentle with the gas when it's shifting. Just out of curiosity, could all of these issues I'm having come from a faulty TCM? I'm going to try and get it back into the local mechanic and see if he can get any codes out of it. The last time he reset them and so now we should be able to tell more.
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  #34  
Old 01-21-2012, 01:40 PM
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Re: Yet another Grand Cherokee Tranny Issue

There could be a problem with the temperature sensor, which is also part of the solenoid pack (its in fact on the transmission range sensor, which is part of the pack). But also the TCM or its programming could be the problem. If you have a good tranny shop nearby, it probably will safe you some time and maybe money as well. Scanning the TCM would be a good idea. When they have the right scanner, you can see a lot of information and life data.
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Old 03-06-2013, 03:15 PM
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Re: Yet another Grand Cherokee Tranny Issue

Hey I know this is an old thread, but was the issue ever solved? My 99 wj is doing the exact same things. I think it's a combo of low fluid and bad solenoid in mine. Gonna top it off to ight and see what happens. I changed the solenoid with a reman unit last year and it was good for a while. But now I'm getting the slip when cold on starting, as well as the stalling. I've also thrown trans codes pertaining to the low end pressure (can't remember the number off the top of my head). Any thoughts?
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