Ive had the tranny out twice in the last year in my 90. I cleaned the flywheel teeth both times. Yes there was junk on the yeeth, more importantly in the three main notches...FYI. just take the inspection plate off and flash a light in there.

 

It's a proximity switch basically. It's all about magnetic field interruption, not atmospheric pressure...unless I'm wrong and someone could correct me.

 

High altitude one advances your timing a bit.

 

So I guess physically the magnet would be in a slightly different spot on the body of the sensor? Or the holes are moved in relation to the magnet? Huh, makes sense.

 

The sensor is offset on the bracket.

 

I will install the another CPS from American auto supply when it comes in. I will give that a shot.

 

Installed another CPS.
still 0.2vac. What a PITA.

 

How's it cranking? Should be pretty "lively". Is the battery up good?

 

Maybe one from Napa, their premium line?

 

Cranking is still around 30 revs.
Battery is full on charger it is a optima red top

 

Napa did not have any available for 87
I was forced to wait for American auto supply. They do not take returns on electrical products. More pita

 

87 to 90 is the same CPS.......Drill it.

 

I drilled the stock one putting out 0.2 v before and after I could bore it out more

 

Not quite sure what you mean by 30 Rev's. I hear mine "hit" about six times in about 2 seconds, would be about 180 rpm. (or in that ballpark anyway). I see you have other Jeeps. It should be cranken as fast as they do.....

Pete, it just won't fire period unless it hits a certain rpm, correct?

 

It takes 3 tries cycling the key with 10 revolutions each then it will start
After it started turn off then try again it takes 6 revoutions. Typical renix motor.