ajcallea

SO I have a 1989 jeep Cherokee with a 4.0l 6 cyl. Lately the brakes have been catching when I stop and then the jeep jolts to start moving. But today out of nowhere when I went to accelerate the engine rev'd to around 2000 rpm's and it barely moved but after it started moving it was fine. Any idea on what either of the problems could be or if they are the same problem?

Roler

Auto or manual?

ajcallea

Automatic

southsidecatac

Check your transmission fluid to see if it's full. If it's low it could cause the takeoff symptom you describe.

ajcallea

I did that yesterday, I might not have put enough bit I did add some

ajcallea

So I realized that it this in drive and drive 3. it does not do it in reverse or drive 1-2.

Roler

It's either transmission itself, or components involved that influence the trans and the way it shifts, to make a rough division into what can cause your slipping, because that seems to be what you describe.

Start simple first: check level and quality. ATF needs to be red/dark pink in colour. Dark and swmlling burned is no good.
Do you know when it was refreshed for the last time? Get this up to scratch first.

If the level and quality are good, next step is differentiation between mechanical issues or electric: this can be done by taking the TCM out of the equation and shift manually. If this shows you have no issues, then it's likely electrical and not mechanical.

Next step would be to look into the solenoids, throttle position sensor, etc...

But this gives you a bit of an idea..

ajcallea

How would I take out the TCM and shift manually?? And thank you for the information.

Kingfisher

Just shift it manually.
Take off in 1/2. Shift it to 3 when it sounds like it should be shifted or watch the tack. Same to D

Cherokeekid4x4

How about no. Driving an automatic like a manual is just gonna cause more problems down the road.

Kingfisher

How about yes!
This is just to isolate the problem!
I didn't mean to do it forever!

ajcallea

So i added transmission fluid and tried shifting manual. It did fine when I was shifting manually and even after adding transmission fluid it still does the same thing as before

Roler

How do you check the level?
And what about the colour/condition of the ATF?

So, with the manual shifting being ok, this points away from a mechanical issue in your trans.
In post #7 I already gave a heads up on the next things...

ajcallea

I have a dip stick that I checked and it was at full and it is a red color. So I need to check the tps and selenoids next

ajcallea

I checked it in park like the manual says after driving a little bit