BensonWdby
07-11-2008, 11:15 AM
I replaced the MDC 1600 controller in my 99 Mobius a couple years agobecause it had water in it. Since then I have had sporadic behavior of the gauges. I will start it up and everything does what it is supposed to, then after a few minutes all gauges quit. After that a variety of things seem to have an impact on getting them back.
1. Shut it off and add gas.
2. Crawl under dash and press all connectors on controller and circuit board to make sure they are snug.
3. Sometime just shutting down and restarting.
The only things these have in common is shutdown - startup. So I started thinking it might be tied to the ignition switch. While I was under the dash and testing to see if pressing connectors helped I turned the key and noticed that the rattling sound the gauges make when they all fire up only happened when the key was in the right place. So thought it might be somehow tied to the ignition and the ground that it creates. And that maybe different people apply different pressure to the key and that maybe some do not turn it far enough??
The other thing we noticed is that the Tach makes a lot of noise when running normally. If you put your ear on it while the motor is running it is quite loud, and erratic. The erratic nature seems to cause unsteady behavior of the needle. Not huge - but detectable.
Any thoughts? Maybe a bad ground in the tach causing prolems for the controller in general?
Dave
1. Shut it off and add gas.
2. Crawl under dash and press all connectors on controller and circuit board to make sure they are snug.
3. Sometime just shutting down and restarting.
The only things these have in common is shutdown - startup. So I started thinking it might be tied to the ignition switch. While I was under the dash and testing to see if pressing connectors helped I turned the key and noticed that the rattling sound the gauges make when they all fire up only happened when the key was in the right place. So thought it might be somehow tied to the ignition and the ground that it creates. And that maybe different people apply different pressure to the key and that maybe some do not turn it far enough??
The other thing we noticed is that the Tach makes a lot of noise when running normally. If you put your ear on it while the motor is running it is quite loud, and erratic. The erratic nature seems to cause unsteady behavior of the needle. Not huge - but detectable.
Any thoughts? Maybe a bad ground in the tach causing prolems for the controller in general?
Dave