By Ken on Tuesday, May 08, 2001 - 09:43 am: Edit

Fellow Discoweber,

I have been in battle with this stalling problem for a week now, and I will share some info with the web. The D1 is still taken apart, but making good progress. After pulling the intake manifold apart, the internal was covered with oil, which is not abnormal, since the factory emission sucks the crankcase vent directly into the intake to be burn. My idle motor (ie stepper motor) was gumed up with black carbon deposit. Which can cause the motor not working. In addition, (I think) there is vaccum leak from the intake, hoses to brake booster,etc... check and replace most of the hoses.

In regard to the subject header, the Idle control plug Land Rover uses looks very similar to some GM unit.... make a long story short..... I went down to Pep boys and bought a idle motor for a 87 GM and the stepping motor is identical. What was different:

Land Rover Stepper motor $165
GM stepper motor $39.99

However, keep your finger cross, I will finished the repair today, and fire up the truck. I do not want to give out the part number until I have tried it myself, making sure it works.

Over and out!

Ken Beck

By pjkbrit on Tuesday, May 08, 2001 - 11:35 am: Edit

Yeah.. I love stuff like this...I need one too so let me know how you make out....Thanks
Pete

By al hang on Tuesday, May 08, 2001 - 12:24 pm: Edit

http://www.rangerovers.net/rrpartsv.htm#electrical

just curious, but is the part the same as in the link above?

-al h.

By Ken on Tuesday, May 08, 2001 - 01:32 pm: Edit

Hey Al,

Not exactly, but Damn, that would have save me some time..... Discoweber is full of info!!!! I think the GM part I got is the same idea.

Ken

By Tsiegwart on Tuesday, May 08, 2001 - 03:05 pm: Edit

Ken, what year is your D1? I believe the stepper motor is different on the 94,95 than the 96-98. At least it's in a different location.

Thanks, Todd 95 Disco, Minneapolis, MN

By ken on Tuesday, May 08, 2001 - 03:47 pm: Edit

I have a 95 Disco1, my stepper motor is located at the rear of the intake manifold (near the firewall) It takes a 32mm socket of wrench to loosen.

Ken

By Jinwoo on Tuesday, May 08, 2001 - 08:11 pm: Edit

Ken, I also have 95 Discovery with stalling problem and might need a stepper motor. I appreciate if you let people know the part number after you try yours.
By the way, is there normal life cycle for stepper motor and how should I maintain it for longer life cycle?

thanks,
Jinwoo

By Jinwoo on Wednesday, May 09, 2001 - 11:16 pm: Edit

Any luck, Ken?

Jinwoo
95 Discovery with stalling problem

By Ken on Thursday, May 10, 2001 - 08:50 am: Edit

Yes, and no. The stepper motor works just fine. But the rough idle comes from a number of problems, which I am still trying to pin point. Majority of the rought idle and stalling is from idle adjustment, and vaccum leak. I took apart the upper and lower intake manifold and reseal it. In additional, all the hoses (brake booster vaccum was replaced (with home made/ pep boys fuel hose/heater hose). The engine does not stall, and idle fine, BUT... there is a fault check engine light..... #48 which is stepper motor. However, when I put the old LR stepper motor back in, the fault is still there.

In actuall.. I think I never had a problem with the stepper motor, but it was really a combination of dirty stepper motor, and air leak around the intake.

The disco manuel suggest if Vechicle Speed Sensor is fault, it will cause stepper motor to become unstable. So here goes another problem.

Therefore, I could post the stepper motor number tonight, but I think there might not be the real problem.

Ken

By Paul L on Thursday, May 10, 2001 - 10:45 am: Edit

Do it...we need the number. Another Tip....for an oxygen sensor, ask for one for a 1991 Nissan Pathfinder and use butt connectors to connect the new sensor to the LR plug (the colors of the 3 wires match). Cost per sensor...about $25.00.....

By Ken on Thursday, May 10, 2001 - 01:19 pm: Edit

I wish I know the O2 part number 6 months ago. I took out the exhaust pipe, drilled the lucus sensor hole larger, tapped and fitted 2 Bosch O2 sensor for $45 each.

I think Discoweb need to start a aftermarket list of alternative parts in the Tech section.... who is the web-master?

Ken

By Ken on Thursday, May 10, 2001 - 10:51 pm: Edit

The stepper motor for discovery1 is Borg Warner #21738 pep boys $39.99. However, I will post next week on what other problems is related to stalling. I have the speed sensor, Engine temp, fuel temp sensors on order (no aftermarket here!).

Ken

By Paul L on Friday, May 11, 2001 - 04:17 pm: Edit

Ken is that what you ask for? Or do you ask for an IAC for a certain vehicle?

By Ken on Friday, May 11, 2001 - 04:56 pm: Edit

I asked for a IAC for a 83-92 GM..... I think we (parts-guy and I ) end up picking a 90 TransAm. The above part number should get you the right part, that number can also be cross reference to AC delco, or what ever aftermarket maker. I have a 95 disco. I think the later Disco have a different IAC, but there is also a GM parts to match. Just ask those Pep boys to start opening some boxes.

Ken

By Nathan Crabtree (Nathan) on Saturday, May 12, 2001 - 11:32 am: Edit

After I saw this post, I went to pep boys and got a stepper motor. I matched it with a genuine one and they look the same. I am going to check a little deeper and make sure this will fit exactly.
If any one needs an oxygen sensor, contact me. The ones I sell are Genuine (exact replacement). You don't have to cut any wires. I sell them for $89.50 each.

Nathan

By Ford Prefect on Saturday, May 12, 2001 - 08:52 pm: Edit

I have read somewhere that the O2 sensors are only used for catalytic converter motors. I have removed the cats and changed the tuning resistor on the computer but am not sure if I should also remove the O2 sensors. The motor seems to run ok with them disconnected but I don't want to do any damage long term. Any help most appreciated.