Quote:
Originally Posted by Ivanerrol
An often overlooked cuase for stalling.
Hall effect sensor on the back of the speedo. It can cause intemittant havoc.
It seems that once you take your foot off the throttle and you are slowing down, this sensor's signal tells the software in the EFI module to prepare for idle mode, without it the computer thinks you actually want the fuel supply to stop all together and as such, shuts down because that is what it thinks you want it to do. Something so small can cause so much grief .
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Its start/stall/start/chug-chug/run behavior is only at startup. It never does it when driving. It runs and drives extremely well. If not for this one little thing, it would be as perfect a runner as you could imagine.
I have a new throttle microswitch on the way. I decided to try it as you can sidestep the "start/stall/start/chug-chug/run" thing by holding the throttle open during cranking, then holding it open a little for a few seconds. Usually you can then take your foot off and the car will be idling perfectly. However, there are times that it will stall as soon as you take your foot off the pedal when you've held it down during cranking. When this happens if you let it go through its "start/stall/start/chug-chug/run" thing it will be fine.
It's seems to need the "start/stall/start/chug-chug/run" thing to happen before it will idle properly.
Replacing the throttle microswitch is probably a crazy idea, but Phil sells them for only $28, so "hope springs eternal."