Low RPM's when XJ shifts into OD

kdailey4315

NAXJA Forum User

Location

Pacifica, CA

• Jun 29, 2010

• #1

When my XJ shifts into OD the RPM's drop to about 1200-1300 and it's almost like it's lugging the engine. This might be related but when driving up a hill at freeway speeds (55-65) my tranny searches a lot, shifting in and out of OD. I usually just put it in 3rd but that's not fixing the problem. Any ideas? TPS?

98 Limited 242 AW4 D35.

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Jun 29, 2010

• #2

Start with the cheap and easy:

1. Check the fluid level and condition.

2. Adjust the throttle pressure cable.

3. Test the TPS.

Still having problems, unplug the TCU and drive it shifting manually to determine if the problem is mechanical/hydraulic or electrical.

With the TCU unplugged you should have 1st in 1-2; 3rd in 3; 4th in D; reverse, neutral and park. If you do get this result, then your problem is electrical in nature.

 

W

WB9YZU

NAXJA Forum User

Location

Madison, WI

• Jun 29, 2010

• #3

Are you using stock sized tires?

 

kdailey4315

NAXJA Forum User

Location

Pacifica, CA

• Jun 29, 2010

• #4

Zuki-Ron said:

Are you using stock sized tires?

Click to expand...

Yes but they have about 0 thread left. Pretty much slicks. Getting new tires next week.

 

kastein

NAXJA Member

NAXJA Member

Location

Rainy side of Washington

• Jun 29, 2010

• #5

Check your wiring harnesses and engine mounts as well as everything Joe Peters said.

 

kdailey4315

NAXJA Forum User

Location

Pacifica, CA

• Jun 29, 2010

• #6

Zuki-Ron said:

Are you using stock sized tires?

Click to expand...

Disregard my last post they actually are not stock size. They are 225/70/15

 

87manche

NAXJA Forum User

Location

Ohio

• Jun 29, 2010

• #7

kdailey4315 said:

Disregard my last post they actually are not stock size. They are 225/70/15

Click to expand...

that's close enough as to not really matter. that was an optioned size IIRC, or 235 was.

I'd start with the things mentioned previously by Joe_peters.

 

W

WB9YZU

NAXJA Forum User

Location

Madison, WI

• Jun 29, 2010

• #8

Sports came with 225's so that's not it.

Hunting is usually an issue if you are under~geared, or overloaded and in "D".

However... You just may want to clean your shift switch. On the right hand side of the AW4, there is a switch assembly, that tells the TCU what gear you are in. If it is dirty, I have heard of symptoms ranging from hard starting (need to jiggle the shifter) to hunting.

Ron

 

E

ERock62

NAXJA Forum User

Location

Duarte, CA.

• Jun 29, 2010

• #9

Could be the AW4 changing from lock-up or non lock-up