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MAP Sensor Testing; OK, I'm confused?
Topic Started: Jan 27 2013, 04:53 PM (3,321 Views)
XFIGUY
Advanced Member
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Cleaning all grounds is probably a darn good idea, I will do that soon.

thanks,
Bill.
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redpepe


this thread has been really helpful .... along with a few other past ones. still struggling with a high idle. it seems to change. i've often thought i've fixed the problem because it sets perfectly and operates perfectly in the yard. then the next day or after a run on the highway it moves up again. ???

i tested the map sensor and increasing vacuum pulls the voltage down steadily. the starting voltage is 4.16v and seems a bit lower than suggested. that voltage should be at the low vac so i'm doubting it affects the idle. if it's too low, then i might have ecm problems ... which i'm not looking forward to. i've done a quick search to see if there's an interruption in the green / red wire but will need to trace it to the ecm ... which i've never had to deal with in 365k miles. btw checked the voltage direct to battery ground and to engine and to map ground pin without change.

at this point i think i need to check the o2 sensor too.
Edited by redpepe, May 26 2013, 07:35 AM.
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nemoskull
Elite Member
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one wire o2 sensors are not the best of ideas. they burn out sooner. 60000 miles or so. check the sticky at the top to get the maintenence schedule for o2 sensor replacement. get a good brand name. i went with bosch 1 wire and it had a nice anti seize coating on it.
when replaceing the o2 sensor, pull it with the motor HOT. otherwize it will takes days with wd40 or may break off when trying to pull it. (heat expansion and all that jazz)
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