Anyone know where i might find the idle stepper motor on a 98 disco LE?

 

Located on the Intake plenum/throttle body casting. It has a black plastic housing, two mounting screws and a four pin connector. Right next to the TPS (throttle postion switch)

Sometimes you can get away with removing it and spraying it down with carb cleaner to clean off the carbon build-up. If this doesn't work I have new ones available for $175.00

Regards,
Geoman
www.eurotekapg.com

 

Thanks Disco mike and Geoman.
I found it ,cleaned it, and nothing the idle is still at like 1500-2000RPM. Also have pitch black smoke(carbon) my driveway looks like i started a small fire on it. Any other ideas guys?

 

Boy are you running rich!Why don't you PM me with your telephone # and I'll call you.
Mike

 

Thanks man.

 

Thanks man. I'm outta light for day here,,but i'll try that on sunday and let ya know. i appreciate the info.
bryan

 

I cleaned the stepper and.....nothing.[:@] What should happen when the stepper is unplugged? I'm still burning straight gas and struggling for air. I think the fuel injectors may not be working or clogged???? Any ideas or thoughts..

 

A hanging stepper displays a characteristic where the engine idle does not come back down after 5-10 seconds of running after initial start-up, but does not affect fuel mixture. I'm sure that Disco Mike gave you some good pointers, but my two cents worth says it is time to hook-up a pressure gage to the fuel rail and see what you get for a value. Normal "key-on" without the engine running is 36 psi, and it should hold this pressure as there is no generated engine vacuum from the regulator to reduce it to the 28-30 psi value that is normal when running and idling. There is a pressure regulator on the drivers side of the engine at the rear of the plenum area. This can go bad, and will not return the extra fuel to the tank, while also delivering too much pressure to the fuel injectors. NOW-- there is a possibility that this regulator being bad is dumping more fuel into the cylinders than normal. The injectors are a timed device that produce a fixed amount of fuel at each pulse. BUT-- if the pressure is too high then the VOLUME at each pulse increases and would cause a "rich running" condition ---hence the black smoke out the tailpipe.

Also-- check the connectors going into the ECU, which is against the firewall on the passenger side of the engine bay.

In any case, continuing to drive it in this state (assuming you even can) will trash your catalytic convertors. You didn't mention anything about a CEL on the dash being illuminated. Usually--- the computer throws this light when any parameters associated with the ignition and/or fuel delivery are outside of normal values.

Have I totally confused you yet?

Best of luck,

Geoman
www.eurotekapg.com