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Truck Repair/MAP sensor trouble code

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sam wrote at 2008-04-21 03:53:52
my name is sam and i am having a similar problem  with my 94 s10 it idles around 2,000 rpms and i dont know what to do about it.. anyhelp would be appreciated


JohnL455 wrote at 2009-09-15 01:41:48
Yes check the EGR as the "motorized" (expensive) types of EGRs like to get carbon chips in the valve.  This will set several false codes and steer you don the wrong path. THe problem is it can reoccur at any time as the carbon flakes off.


bull wrote at 2010-03-24 04:25:36
check your knock sensor behind the starter..i was having the same trouble and it was part of my solution..


matt wrote at 2011-10-05 02:19:32
Try unhooking both battery posts for a minute.  I would double check to be sure they timed it properly. I wonder if you could be losing vacuum through your brake booster.




Tom wrote at 2012-07-08 01:03:01
A small note in measuring the MAP supply voltage. You must measure the supply voltage referenced to the ground supplied by the ECM. If this voltage drifts then the ECM may be at fault. I do not know what the allowed tolerance is.


G wrote at 2015-03-01 11:09:53
A faulty ground at the tag light caused me many of the same problems and lot of dollars at my machanic! Check it out!


Old school wrote at 2015-09-19 20:11:23
I agree It is something to do with Map sensor, not that it is bad but that u do not have Manifold Absolut Pressure ! Meaning u have a manifold gasket leaking air or vacuum ! This MAP crap is so important to sensor's that most will not run at all !! Good luck hope I helped !  


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