MJ barely goes forward

[Southernmanche]

I have an automatic 4wd automatic 4l i6. My comanche barely goes forward while in drive but works fine in reverse. When I put the pedal to the floor the engine responds but little to no power is generated. I’m wondering what the problem is, I’m guessing the torque converter. Any suggestions or help would be much appreciated, thanks.

[jdog]

If you shift it manually ie 1 to 2 to d does it operate normal? If so

Suspect tcu under passenger knee bolster is either unplugged or the fuse is missing

[jpnjake]

Also be sure to check the fluid level, it probably isn’t the problem but low fluid can do odd things 

[Southernmanche]

Alright guys thanks for the feed back, I’ll let you know how it goes.

[cruiser54]

CRUISER'S MOSTLY RENIX TIPS

TRANSMISSION CONNECTOR REFRESHING

OCTOBER 30, 2015 SALAD 24 COMMENTS

 

Over near the transmission dipstick tube are 2 rather large connectors. One is black and goes to the NSS and the gray connector goes to the transmission itself

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. 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.

[Southernmanche]

So I’ve refreshed all the connectors but no luck. Today I will be doing a transmission flush, hopefully it solves my problem 😂.

[boxyjeep]

This happened to me when I tried driving with the TCU disconnected.  You should get a REM if you don't already have one to see what the TCU is reading (or not reading).

[Southernmanche]

Just did a trans fluid flush and changed the filter but no dice

[jdog]

If you shift it manually ie 1 to 2 to d does it operate normal?

[Southernmanche]

On 3/15/2023 at 3:10 PM, jdog said:

If you shift it manually ie 1 to 2 to d does it operate normal?

Nope it still crawls with the pedal to the ground.

 

[jdog]

What did the fluid look like?

[Southernmanche]

It was dirty but nothing unusual. No large metal pieces or metal shavings in the fluid.

[Southernmanche]

There was the usual metal dust on the magnets though