Whats the MAP sensor do??
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Whats the MAP sensor do??
I unplugged mine just for kicks....and there was no change. Engine ran the same, trans shifted the same (bad) and truck drove the same. Only thing it did was turn on the CEL. So whats it do?
Post Fiend
Joined: Oct 2003
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From: MICHIGAN
MAP = Manifold Absolute Pressure sensor. As the name implies, it measures the pressure in the intake. Tells the PCM how much fuel to give the engine. If you unplugged it and there was no difference then you might have a problem. When the PCm sees the MAP is bad or unplugged it will resort to a preset fuel table stored in the PCM. The engine won't fall flat on it's face but It should be pretty doggy though. Look for pin holes in the small rubber line going to it or boost leaks else where.
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Hotshot
Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
Icebox- it's mounted on a bracket over by the heater core on the pass. side of the engine- has a 3-wire electrical plug and a rubber hose running to it. If you have a boost gauge, you probably tapped the rubber line for your boost gauge fitting.
Post Fiend
Joined: Apr 2004
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From: Silver Lake Dunes, MI
Originally Posted by IceboxFX
could anybody point me in the right direction/have any pics of the map sensor?
Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
Originally Posted by IDMooseMan
TJ,
Is that an OEM regulator or are you tricking the MAP for some reason?
Is that an OEM regulator or are you tricking the MAP for some reason?
What happens is the MAP sensor isn't designed for those boost numbers so it signal gets messed up and the PCM doesn't know what to do with it. So we trick the MAP sensor and move on.
Cargo Master
Joined: Jul 2006
Posts: 2,756
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From: Nampa, ID
My rig is not modified like yours. I imagine adding this regulator to my rig is not necessary at this time, right? What is causing your engine to defuel? Is it the high boost levels?
With my stock engine, I should see a maximum of what PSI boost?
Sorry for the
questions.
With my stock engine, I should see a maximum of what PSI boost?
Sorry for the
questions.