Testing 86 Map sensor

[black86glhs]

I was testing the map on my "S" and just want to verify my findings.
1) KOEO-using a voltmeter I find close to 2.25V when I check between both black & white and red & white.
2) still KOEO-connect vacuum pump and see map voltage drop, as I pull vacuum, while monitoring black & white wires.
3) still KOEO-see map voltage go up, as I pull vacuum, on red & white wires.

Is this how the map is supposed to work on the early LM cars? Thanks for any help.

[black86glhs]

What, all the smart people on vacation? Come on Simon......LOL.

[Darkapollo]

AFAIK yes.
You really just need to watch the black and white wires.

[black86glhs]

Ok, thanks. After I got the lack of vacuum to the map sensor taken care of, I now seem to have a problem with #3 & #4 cylinders.