McQue
NAXJA Forum User
- Location
- Plainville, Connecticut
Don't know the answers to your questions, but just thinking out loud here...Here is a theory for you to ponder:
Assume good MAP and MAP wire circuit and ECM.
My 01 FSM states that the "Map sensor input is the number one contributor to fuel injector pulsewidth". So I also assume if you disco the MAP and things work ok, the ECM must be determining fuel injection pulsewidth as if it is in open loop mode, or at least determining injector pulse width without the benefit of input from the MAP, or it thinks the MAP is saying "all or nothing" with respect to manifold vacumn...I would guess it is saying to the ECM, I sense no manifold vacumn.
Having said all that, when the Map is connected it is providing good input to the ECM for injector pulsewidth change, but your motor doesn't like the results for some reason.
Makes me want to really understand how your entire fuel delivery system is working.
Assume good MAP and MAP wire circuit and ECM.
My 01 FSM states that the "Map sensor input is the number one contributor to fuel injector pulsewidth". So I also assume if you disco the MAP and things work ok, the ECM must be determining fuel injection pulsewidth as if it is in open loop mode, or at least determining injector pulse width without the benefit of input from the MAP, or it thinks the MAP is saying "all or nothing" with respect to manifold vacumn...I would guess it is saying to the ECM, I sense no manifold vacumn.
Having said all that, when the Map is connected it is providing good input to the ECM for injector pulsewidth change, but your motor doesn't like the results for some reason.
Makes me want to really understand how your entire fuel delivery system is working.