Last post on Dec 05, 2013 at 7:03 AM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee, Jeep Cherokee, SUV
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#4289 of 5143 Re: 2004 Jeep Grand Cherokee Laredo [daveriggs981]
Oct 01, 2008 (6:29 am)
It may have changed, but my experience has been that the Engine Computer(ECM) has wires that connect to the Body Control Module (BCM). The BCM also has wires that connect to other parts of car. The BCM controls instrument cluster. It's another computer in the car. ECM needs to communicate with BCM or car won't run.
After replacing your ECM, your problem could be wiring between BCM and ECM, the BCM itself, or both. Or it could be a wiring harness for ECM that connects to engine. Because dash is acting funny, I would look at BCM first.
The only way to know what is going on is to pull the BCM, inspect it and inspect wiring harnesses, i.e. the connectors that plug into BCM. I'd be very surprised to find a damaged section of wire 1/2 way between ECM and BCM. My BCM has 3 connects. 2 are 32 pin and one is 24 pin. The BCM has a lot of wires.
It's a pain to get at. It's under dash. Mine is to left of steering wheel. Disconnect (-) on battery first. Start pulling panels off dash and you should be able to find it. You have to disconnect cables before removing it. Be very careful with connectors. It's easy to break the retaining tabs (I did it). Initially, cables are hard to disconnect. There is risk. The good news is that once you have it you can stop guessing all the time.
1. You could have a broken or bent pin where the cables attach to BCM. Replace BCM.
2. A single wire or group of wires may have pulled out from the connector. You only need repair these wires. Not replace whole harness.
3. The end of the wire may have gotten pushed back into the connector, but it didn't pull completely out. Inspect connector sockets with flashlight.
4. You can try re-installing the BCM and make sure connectors are on tight (push em in). Your problem may have been loose connector.
If you have to really stretch a harness so it can connect to the BCM, that's probably your problem. The original harness is too short. You will have to replace harness.
If you suspect BCM, you can probably get used one for about $200. It has to be programmed with info from your BCM or car won't start. I believe you can find this service on the web. Cost is ?, but certainly a lot less than $2,000.
This is time consuming which is why dealer cost is high. You have to like your car or enjoy this activity.
You will certainly know more about the problem. You could get lucky and spot something obvious that fixes it completely.
#4290 of 5143 Synthetic oil?
Oct 01, 2008 (4:27 pm)
I have just bought a 2004 grand cherokee Laredo Special Edition with only 5580 miles on it...that's right.....ACTUAL miles!!. My question to the experts is......Would it be a good idea to use Mobil 1 synthetic oil? I want to convert to synthetic oil, as i have on all my other vehicles, but would like to hear your opinions.
#4291 of 5143 Re: Synthetic oil? [bigjer2]
Oct 01, 2008 (6:05 pm)
have used it in my 2000 and have 188000 miles on it and still dont use any oil betwen changes at 7500 miles
#4292 of 5143 Do I have to buy 4 tires or just 2 on 99gcV8 4x4?
Oct 03, 2008 (11:36 am)
I have about 10 grand in repairs and upgrades on my 99 GC laredo V8 4x4 quadradrive 2. Dealer mechanic claims that replacing the 2 front tires only will destroy the transfer case, even though the rears are only 1 year old. I bought goodyear wrangler SSR all season radials for the front,(same as factory uses) and left the rears alone, since the fronts were bald. The rears have almost 90% of their tread left.
BTW, I bought this beautiful gunmetal V8, heated leather clad seats, infinity stereo, etc. For 6500 in March 08. For a laredo, it has every option except cd changer. THANK GOD I BOUGHT THE CHRYSLER POWERTRAIN WARRANTY!!!!!!. Chrysler paid out 7200 in replacing the all wheel drive system, engine computer, trans computer, body computer, transfer case, all 4x4 related seals, battery, and two tires, A rental car was provided free. Safford dodge/jeep in Springfield VA is very honest and has always kept their promises, but I just dont buy the fact that I need to replace all 4 tires at once. Please help!! I dont want to mess up my finally-fixed jeep. Thx, Chris
Is the mechanic being truthful? The rear tires AREE the exact same size, but a different brand with a more sporty/passenger tire look. I need to go to buffalo in December...will transfer case go bad due to 1/4 inch tread difference?
#4293 of 5143 Re: Do I have to buy 4 tires or just 2 on 99gcV8 4x4? [cskalski]
Oct 03, 2008 (12:05 pm)
I always was told the big problem is if you have two different sizes on left and right. The basic problem is the diamater of the tire..not the width. If there is a difference in the dia. It will work the case gears all the time. Can you take it out of 4 wheel all the time and shift to 2 wheel drive? That would solve the problem too. My 93 is 4 wheel all the time but I have to say I rotate the tires regular and when they all look bad I replace all four and have not had a problem. Just check the size. One way that is old fashion is to take a piece of string...nylon that will not stretch and wrap it around the tire and where the end meets mark it will a marking pen. Go do the same thing with the new tire. If there is a big difference then you might have something. If not I would just go for it.
#4294 of 5143 Re: Do I have to buy 4 tires or just 2 on 99gcV8 4x4? [cskalski]
Oct 03, 2008 (12:11 pm)
yep you should replace all 4 tires on a all wheel drive as what your jeep is
when you replace only one axel the trans fer case will think that you are sliping one axel and then shift power to the axel with old tires then shift back and forth as you go down road
with 1/4 inch deffrence the tire will travel aprox 1/2 foot less than the axel with new tires thus working the viscus clutch pack in the transfer (that is the weakes iten in transfer case)
#4295 of 5143 93 Grand Cherokee
Oct 13, 2008 (1:44 pm)
I recently purchased a 93 Grand Cherokee for my son. The alarm went off on it and i do not have a owners manual or reset button for this. How can i reset this alarm? I have tried placing the key in the passenger door and turning it several times, i have disconnected the battery cable as well trying to reset it this way. Does anyone have any suggestions?
#4296 of 5143 Re: 93 Grand Cherokee [juan2surf]
Oct 13, 2008 (3:20 pm)
if you have the remote opener press the alarm /panic button
#4297 of 5143 Rear axle bearings
Oct 13, 2008 (4:12 pm)
I have a 97 JGC Limited 5.2 V8.
Can I guess the rear end is a DANA 35c? How can I tell if it's a DANA 44? The bearings/seals are different according to a couple parts houses I've browsed.
Anybody changed axle bearings? Do you need a press? Are there any not-so-obvious gotcha's?
Any gouge will be appreciated.
Cheers --- Clip
#4298 of 5143 Re: Problems with 2005 GCL [jkram]
Oct 14, 2008 (11:12 am)
Did you ever find the issue with your transmission , sputtering/jerking?
I have an 05 GC 5.7hemi with the same issue, I have had the torque converter replaced and even looked at several engine side components but have not found anything.