AW4 problems? Maybe Torque Converter? - JeepForum.com
 
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post #1 of 11 Old 12-08-2012, 04:09 PM Thread Starter
BleepinJeep
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AW4 problems? Maybe Torque Converter?

Hey guys, Ive been searching but cant seem to find anyone with my same problems.

I haven't driven my jeep in a while and today I started it up and it didn't want to go... it was engaged and revving but felt like there was no torque. I put it in 4 low and it had more torque but still not normal. I finally got it out to the street and it would drive in 2wd but the rpms were much higher than normal and if I came to a hill you can just forget it. had to put it in 4wd and rev it up to 4000rpms to slowly creep up the hill.

The tranny fluid is nice and red, not burnt. The last time I drove the jeep I noticed this happening slightly but only when cold... but it would always go away. Today I got it really warm and still no go.

I'm not sure where to start but am leaning towards the torque converter. Anyone have thoughts or input?

Thanks,

Edit - I just figured out that I have plenty of torque in Reverse. So is it possible that when I put it into drive it's going straight to 3rd or 4th gear? That would explain why I have more torque in 4 low and plenty of torque in Reverse. But I still don't know what the problem is?


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post #2 of 11 Old 12-08-2012, 04:52 PM
jnicewan
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Does the TC stall at normal RPM? Can you manually shift it down to a lower gear? Anyway is a TC was the problem it should have the same symptoms in Rev as in Fwd. Without more detail it sounds like you might be taking off in a higher gear. Do you have access to a scanner that can read codes? Sounds like its in default mode so maybe the manual shift positions will do something or maybe it could be a problem with the shift solenoids.
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post #3 of 11 Old 12-08-2012, 05:53 PM Thread Starter
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Thanks, Ya just a while ago I figured out I can manually shift it down into first no problem. So what is happening is it must be going straight to 3rd or 4th gear when I put it in drive. I don't have a scanner... It is a 1988 XJ.

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post #4 of 11 Old 12-08-2012, 06:57 PM
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Up under the dash on the passenger side is an inline fuse. I think it's a yellow wire. Provides power to the TCU. Pull the fuse. I bet it's blown or corroded.

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post #5 of 11 Old 12-08-2012, 08:06 PM Thread Starter
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Quote:
Originally Posted by cruiser54 View Post
Up under the dash on the passenger side is an inline fuse. I think it's a yellow wire. Provides power to the TCU. Pull the fuse. I bet it's blown or corroded.
thanks, I tried that but it seems to be fine

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post #6 of 11 Old 12-08-2012, 08:19 PM
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Tried this?


Cruiser’s Trans Plug Refreshing


Over near the transmission dipstick tube are 2 rather large connectors. One is black and the other gray. These 2 connectors carry all the info between TPS, TCU, NSS, speed sensor, and transmission solenoids.
Unplug each one, visually inspect for corrosion or bent pins, spray them out with electrical contact cleaner and plug them back in.


Additionally, if your Jeep is an 87 to 90 Renix, it’s always a good idea to reach up under the glovebox area and unplug the connector to the TCU and spray it out along with the receptacle of the TCU. While you’re there, find the fuse right in that area for the TCU. Remove it and spray out it’s receptacle and clean any corrosion from the fuse.

Revised 9-10-2012

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post #7 of 11 Old 12-09-2012, 09:21 AM Thread Starter
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Quote:
Originally Posted by cruiser54 View Post
Tried this?


Cruiserís Trans Plug Refreshing


Over near the transmission dipstick tube are 2 rather large connectors. One is black and the other gray. These 2 connectors carry all the info between TPS, TCU, NSS, speed sensor, and transmission solenoids.
Unplug each one, visually inspect for corrosion or bent pins, spray them out with electrical contact cleaner and plug them back in.


Additionally, if your Jeep is an 87 to 90 Renix, itís always a good idea to reach up under the glovebox area and unplug the connector to the TCU and spray it out along with the receptacle of the TCU. While youíre there, find the fuse right in that area for the TCU. Remove it and spray out itís receptacle and clean any corrosion from the fuse.

Revised 9-10-2012
No, but I'll give that a try next, thanks!

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post #8 of 11 Old 12-09-2012, 12:43 PM Thread Starter
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ok, I found a great writeup here: http://www.transonline.com/transdige...ers/index.html

I followed this advice and found a small negative voltage at C10 WITHOUT the brake depressed and more negative voltage when the brake IS depressed. He doesn't mention negative voltage or what to do if there is voltage even without the brake depressed...

Any thoughts?

What is negative voltage anyway??

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post #9 of 11 Old 12-09-2012, 07:51 PM
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Quote:
Originally Posted by BleepinJeep View Post
What is negative voltage anyway??
Thats when you have the meter leads reversed.
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post #10 of 11 Old 12-09-2012, 08:24 PM
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Quote:
Originally Posted by jnicewan View Post
Thats when you have the meter leads reversed.
Pretty much.

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post #11 of 11 Old 12-28-2012, 09:41 PM Thread Starter
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Well I couldn't figure it out so I replaced the TCU and problem solved...

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