2001 GTX RFI no spark

[oldbugger]

long story but the last part is that after a compression test (150, 155) and resistance testing all sensors (TPS, CPS, ATS, WTS, APS) I hook everything back up to find NO SPARK. 5 Vdc at ignition coil when I depress start button with no lanyard attached. Primary resistance check of coil shows resistance readings within specifications. I double checked MPEM connections, I get 2 beeps on lanyard install, engine cranks fine, battery is at about 12.5 Vdc, I have plenty of fuel going into cylinders and have verified no spark at plugs oh and I tried new plugs since I had a set.

5A fuse in MPEM is good, all fuses in in battery box are good

Also checked battery ground, coil ground and mpem ground...all good

Any other thoughts before I buy a coil??

 

[oldbugger]

I bought a coil and have the exact same issue still, anyone have any thoughts?

 

[Minnetonka4me]

Ive never had a no spark issue on a RFI...it seems that most issues on RFIs end up being the mpem, but I would go thru everything. Pull the crank sensor and make sure it doesnt have a bunch of metal stuck to it.

 

[oldbugger]

It turns out that when I inserted my test leads into the pin holes in the MPEM plug (to perform resistance measurements) the test lead probes were slightly larger than the pin on the MPEM and they expanded the socket just enough to not allow proper connection be tween the socket an d the pin. I though that I had addressed this by using a small screw driver to "squeeze" the end of the socket into a smaller diameter but it turns out that I had to take the face of the plug off, exposing all of the sockets and then push the little tabs of the socket (that are designed to "grip" the pin) inward to tighten the contact to the pin. I used the shank end of a #55 drill bit (.052" dia) to test the "grip". After checking all of the sockets and putting the plug back together I have spark back!

Kudos go out to the guys at CanDooPro for suggesting the procedure for checking the sockets and their grip!