MPEM Question

[oldersummit]

I have a 1998 Summit X 670 and have been having some problems with eratic idle and fouled plugs. (rich) Been thru the carbs and don't see any problems with them. Suspected DPM so dug into that. Found that I had no power to the enrichment or comp solinoids. Either after start (cold motor) or above 2500 RPM after warm-up on the comp solinoid. Doesn't make a difference if I unplug the air temp sensor or the coolent temp sensor. Thought I had a corroded plug in line with the MPEM. Looked into that and all connections looked good without corrosion and ohm checked good. My DESS light will blink intermittently after some starts, but goes away after 15-20 seconds or after messing with the tether cap. Bogged under 3000 RPM a couple times in the garage, but runs OK other than that. Glitch in the DESS? I would like to check the stator resistance, bu not sure of the values I need to see. Want to rule everything out before replacing the MPEM. No water in fuel and all lights and warmers work great. Ran great first ride of the year, and suddenly started acting up. Bit of a new guy here, just looking for advice.

 

[sdobbs20]

if you can, take it into your dealer and have them plug it into the computer. they'll be able to hook it up and see what errors the system has current/active/occurred ones. from there you'll get a better direction of what is going on.

 

[sledsrock]

ttt

I thought that was a 99X, the date stamp on the tunnel should be latter part of 1998 -would put it at a 99 model year with the yellow hood. I don't know if there is any MPEM differences between those two years, but just in case.

Somebody needs to chime in here and help this new guy out..........as my old clunker is non MPEM and non DPM.

 

[bri74]

If you do take it to the dealer make sure that you tell em that you were unplugging things they may just plug it in and see the codes for the sensors you had unplugged as they should be stored in the memory. So have them clear codes first then scan it. Just a thought.