MAP sensor with carb.
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Tourer
Joined: Sep 2007
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From: Northeastern Md.
MAP sensor with carb.
I'm changing intake seals on my '06 carbed RK.Discovered a MAP sensor on top of the intake.Looking at a diagram,this sensor runs to the ECM./ignitin module.......why on a carbed engine?...Timing under certain conditions?Could the popping-at deceleration/using engine for brake be linked to this by chance?Should I replace the seal for it?
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Joined: Mar 2010
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From: Honah Lee
It will throw a code if not working properly. Think it controls carb at altitude to lean. But not not sure yet in my diagnostic book what it controls on carb.
Last edited by Jackie Paper; Jun 4, 2013 at 03:38 PM.
Extreme HDF Member
Joined: Sep 2010
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From: Phoenix '53, '88, '09 Big Twins
when you whack open the throttle- engine vacuum drops...so timing is retarded, which will allow more torque...same thing if running up a hill or similarly loading the motor ( headwinds, 500 pound passenger).
when the motor is clipping along at light load--- part throttle cruising, the timing will advance to give better fuel economy.
the earlier version used the VOES ( vacuum operated electric switch) for this function.
the amount of vacuum to trigger the switch depending on the model of bike, and some were adjustable.
this is similar in function/result to the vacuum advance on the side of the distributor on the old chevy, ford, dodge etc.
engine vacuum is highest when decelerating.
lowest at WOT
it is a good thing
before timing was controlled by these, as well as maps in modules, centrifugal weights etc. the rider controlled timing advance manually- usually with the left hand grip
mike
when the motor is clipping along at light load--- part throttle cruising, the timing will advance to give better fuel economy.
the earlier version used the VOES ( vacuum operated electric switch) for this function.
the amount of vacuum to trigger the switch depending on the model of bike, and some were adjustable.
this is similar in function/result to the vacuum advance on the side of the distributor on the old chevy, ford, dodge etc.
engine vacuum is highest when decelerating.
lowest at WOT
it is a good thing
before timing was controlled by these, as well as maps in modules, centrifugal weights etc. the rider controlled timing advance manually- usually with the left hand grip
mike
Last edited by mkguitar; Jun 4, 2013 at 04:15 PM.
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