I was just checking the water temp sensor, idle control valve, air flow meter, etc. per the Bentley manual. Usually when checking for supply voltage to sensor, it says to check for approx. 5 VDC to ground. My idle control valve had 5 VDC going to it. The water temp sensor and AFM appeared to have about 2 VDC. Does this sound right? Also, when I do the stomp test, I get a short light, long pause, long light, long pause, then the process repeats. I do not appear to be getting any codes. I disconnected the battery overnight on Friday to reset things and still get this reading. Do I have a DME problem? Are these two symptoms related?

This all goes back to the fact that I have a slight surging at cruise speeds of 50-70 mph. I've adjusted the valves, put in new plugs and plug wires, cleaned the cap and rotor, replaced a few bad vacuum hoses and cleaned the throttle body. The idle control valve appears to be working fine. Everything appears to be in great working condition. I just don't seem to be able to find the cause of this.

I would like to check the fuel system next. I just need to come up with a high pressure fuel guage. Any suggestions on any of this would be appreciated.

Grace and peace,

Robert K
slightly ailing 1991 535i