84 B23F. I've been on here for this problem before. When I first start the car it runs so rich, it sounds like it's missing. Heavy black exhaust smoke and smells like gas. I know it's not missing because I replaced the plugs, wires and cleaned up the newer cap & rotor and no change. After a few minutes the car runs fine. It takes longer now since the weather got colder.
The wires going to the temp gauage have been replaced and it works fine. I can't tell the condition of wires going to the other temp sender from the bottom because there is no room to get to them. I peeled back the upper portion of the harness and it looks like new. I think the blue wire is the one in question as well as a ground. I have an extra 2 prong sensor from an 81 B21F in good shape. If I could get to the sensor plug, and get it undone and plug it into this one, could this be a way of testing it? Is this the wrong sender to use?
Am I barking up the wrong tree? Blown head gasket? Screwed up MAS meter? I'm lost. A few years ago I plugged in a MAS from an 86 B230 to see if it works (It didn't) Actually it ran exactly how it does now. Heavy rich with a miss.
Only one other possibility. I had a bad plug wire that was shorting the coil last summer. There was lightning zapping across the coil terminals. A new set of wires and pluges cured that, but could it have somehow delay damaged the MAS since it's only a few inches away from the coil?
Ben