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DKs and the spark sensor... (archive)
[ Follow Ups ] [ 8-series (E31) Message Board ] [ Msg. Board FAQ ]
Posted by Kevin on May 20, 2001 at 21:34:37:

In Reply to: Re: Don't think its the intake gaskets... posted by Mike Simard on May 20, 2001 at 18:42:01:

Can't say I understand the subtle interactions of the DKs with other parts of the system, but in my attempt to rule out the cheap/obvious solution, I took off the vacuum test plug and shot a good quantity of gumout in just ahead of the DKs, so I'd have to think that they are relatively clean. They seem to respond equally side to side... at least as well as a visual inspection while someone else jazzes the throttle can tell.

Regarding the subtleties of intake leaks... I'm sure that the Motronic system can (and will) compensate for small leaks, but my experiences with the system lead me to believe that it would thow us a code if the system was out of spec so far that it caused conditions like I am experiencing... I've never had an undrivable car and no codes before. Usually I have a car that drives more or less OK, but the silly system flashes codes at me left and right!

I'm still thinking that Stan is on to something with the crank rotational sensors, however mine ohm'd out OK today which puts me back at square one... at least as static component testing goes. In the process of testing the rotational sensors, I came across the spark inductive sensors... anyone had any experiences with these and understand their function?


I agree that the manifold vacuum wouldn't be different with an intake leak because the throttle will maintain engine speed and therefore manifold pressure regardless of where the air is coming from. My guess would be an intake leak that is within the controllers ability to make the O2 sensors happy and prevent codes but leaves some cylinders running too rich.
BTW, just thinking out loud about dk motors. If they were slugish from grime and operated slowly, could they create a condition of more fuel being supplied during their movement to the position that the computer thinks they should be at? Could this affect minute movements like maintaining idle? I understand that they are designed to create alarms at any sign of being too open but would a slugish dk motor be noticed by the system?




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