I have a techtom MDM-100 and tonight on the way home I noticed that the RPMs jumped to 12 RPM while going down the highway at 3000+ RPM!! Could this be a crank angle sensor problem? Also, when the cruise control is on, the RPMs will jump from 3150 to 3112 to 3137, ect. It wont ever stay stedy when I'm holding my foot on the gas. Its strange, but I think I'm going to change the distributor out unless anyone can equate these problems to something elce. Please help me out. Thanks guys.

~Ryan

As for the cruise thing I can understand that - the car is trying to keep the same speed and probably hunting all over the place to do so....

As for going from 3000+ rpm to 12 - thats odd.... I would think that if that was TRULEY happening (as in the ECU was seeing it) you'd be having drivability issues as the car would try to compensate for that.... But then again who knows.... You ought to take it to autozone or someplace that does readings for free, tell them you think the CAS sensor is bad....

Chris

No, I can hold my foot on the gas and the RPM's will bounce around and I wont move my foot one bit, it will go back to the same numbers, 4150,4137,4112,4175, it will keep moving around while the RPMS' dont change. It also has a miss to it thoughout the RPM band. I think this sensor is causing my low ET's and trap speeds. I'm just gonna change my distributor out I think. As far as the cruise hunting all over the place to the speed to stay stedy, the gas pedal doesnt move at all when the RPMS change, and the cruise is hooked to the same throttle linkage. We aren't driving a throttle by wire car..;) The RPMS would do the same thing if I was being the cruise control and not setting the cruise. So its not the computer doing this. Thanks for your imput, I dont know of any place that will check the CAS, I'll stop by Advance autoparts though.

~Ryan

Changed it out, didnt help at all. This is making me angry...:mad: