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MAP and Barometer Sensors on 1994 Pro Boss

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sandro.zaal View Drop Down
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    Posted: September-05-2019 at 7:27am
Hi.
There are two sensors MAP and Barometer located over each other ( MAP is lower and Barometer is upper). They both have a pipe for hose. I noticed, that only one (MAP) has a hose connected to the throttle body. Barometer is just not connected. Is it OK..? or there should be a splitter which connects these two sensors to the throttle body. Any ideas..? Thanks
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: September-05-2019 at 8:20am
Originally posted by sandro.zaal sandro.zaal wrote:

Hi.
There are two sensors MAP and Barometer located over each other ( MAP is lower and Barometer is upper). They both have a pipe for hose. I noticed, that only one (MAP) has a hose connected to the throttle body. Barometer is just not connected. Is it OK..? or there should be a splitter which connects these two sensors to the throttle body. Any ideas..? Thanks


The MAP sensor is sensing engine vacuum and the barometric sensor is sensing pressure outside the engine.

The system compares these readings to adjust operating parameters like timing and fuel flow so you don't want them connected together

The barometric sensor is OK just open to the atmosphere as it is right now, or in other words that's how it should be
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sandro.zaal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sandro.zaal Quote  Post ReplyReply Direct Link To This Post Posted: September-06-2019 at 4:23am
Thanks for quick respond.
Still chasing unstable idle. Changed idle control valve recently. Same :(
Can bad MAP sensor affect on idling..?

Look at this video:

Thanks
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gun-driver View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gun-driver Quote  Post ReplyReply Direct Link To This Post Posted: September-11-2019 at 1:26pm
Yes it could but it could also be a vacuum leak.
This shows how to do a generic test on your MAP sensor, refer to the reference section on CCF for the manual and voltages
https://axleaddict.com/auto-repair/Bad-MAP-Sensor-Symptoms-and-Testing
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sandro.zaal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sandro.zaal Quote  Post ReplyReply Direct Link To This Post Posted: September-17-2019 at 9:12am
Originally posted by gun-driver gun-driver wrote:

Yes it could but it could also be a vacuum leak.
This shows how to do a generic test on your MAP sensor, refer to the reference section on CCF for the manual and voltages
https://axleaddict.com/auto-repair/Bad-MAP-Sensor-Symptoms-and-Testing


Im afraid you are right ! There is a leak between the throttle body and the engine. The massive piece of gasket is missing. Going to make a test this week.

Thanks.!
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