some l98 help please

Not sure about the map sensor wire, but as for the tach wire....on my '86 their's 2 beige wires with brown connectors near the distributor. One is for the tach, and the other we could never figure out what it was for. I was told that it may be for diagnostic purposes that the normal person would never need. See if you have both identical wires. If you find another just like the one you have for the tach, plug that one in. My tach did not work when I bought the car, but once I found the "other" wire and plug it in it worked.

(click on pic for bigger)

map sensor local


this where i am looking....well all over but.....


est...or electric spark timing. undone when setting timing

The arrow in the picture is actually pointing to your MAT sensor.(manifold absolute temp.) The wiring for it is in one of the harnesses that are behind the plenum, around the distributor. You are looking in the right place. May need to take the loom off to find them because if they are cut, they may have slid into the loom. When I get home from work, I can see if I can get a picture of mine for you. But you really should take the MAT sensor out of the plenum anyway, and you will gain a couple HP. Unscrew it from the bottom of the plenum, And plug the hole with a screw in plug with sealant on it so it doesn't leak vacuum. Then drill a hole in your plastic air cleaner housing, and screw the sensor in there. Then once you locate the wires to it, extend them out to the sensor. Just make sure you locate it where the hood won't hit the sensor when it's closed. When that sensor gets real hot from engine heat, it can lean your motor out too much. The cooler air coming through the air cleaner housing will prevent that and will actually gain a few hp when the engine is hot.