I recently drove my 96 Disco I 3000 miles from Seattle to Arkansas. While in the Arizona desert, 200 miles from anywhere, my vehicle speed sensor went out. It scared me pretty badly when it started to stall, but then I noticed the speedometer going nuts, and realized that I could just unplug the sensor and drive to safety in open loop mode. That worked great with one exception. My Idle speed was a little faster every time I would stop for gas. After driving 1200 miles with the VSS unplugged, I finally reached my destination, promptly sourced a VSS, and installed it. The new sensor works great, but to my dismay, the Idle speed is still around 3000 RPM. The stepper motor is functioning, but not correctly. It starts at normal speed, but within 8 seconds it slowly opens up to 3000RPM. When the engine is shut off, the stepper motor closes again. I read on the rave cd that a failed VSS will do this, but I had hoped it would clear up with the new VSS. Do I need to have the stepper motor recalibrated? No vacuum leaks. The only codes are P0446 and P0451. Also the O2 sensor heater monitor, and the Evaporative control monitor will not run there tests. They do not seem to be related, but did appear at the same time as the idle problem. Please help. I would like to have some kind of clue before I go to the shop.
Thanks in advance.
Regards
Thad G.
Thanks in advance.
Regards
Thad G.
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