[johnman001]

I've been fighting a running issue with a 3.2 Motronic engine for some time now and have been doing a bunch of testing, but not definitively finding my problem. I even have gone so far as swapping out the DME and AFM for known good units just to have the same symptoms.

I've built a breakout box and have tested everything that I know to test, but today I was fiddling around and I tested something that I thought wasn't actually required.

I tested my altitude correction sensor (the round sensor mounted near the DME relay and the DME Unit itself with a two pin connector). In any event, when testing the sensor, it shows closed circuit. My manual says that the contact is supposed to close at altitudes above 1000 meters above sea level. Being in the midwest, I doubt I will need this device unless I drive to Colorado or in other mountains.

Am I correct in believing that this device should be open circuit or infinite Ohms unless I'm at 1000 meters above sea level?

My other 3.2 cars measure open circuit, so I think I'm correct, but wanted a second opinion.


My other question would be, when does this sensor come into play?

I figured out at the last track event that the car will run ok at part throttle (I'm assuming up until the full load switch (Throttle Position Sensor) contact closes, because if I lifted and ran at part throttle, the car did pull strong to a point, but not like full throttle.

Because of the way the car was running, I was suspecting the cylinder head temp sensor, but perhaps a shorted altitude correction signal would throw off the air fuel mixture as well.

Anyone else run into a shorted Altitude Correction Box? Do folks replace these or just unplug them?

Thanks in advance for your suggestions.