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post #1 of (permalink) Old 01-30-2001, 02:55 PM
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MAP Sensor

Hello all, can anyone tell how I can check to see if my MAP (not MAF) sensor is good or bad. I have an '88, 351 Bronco. Thanks in advance.
AAM

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post #2 of (permalink) Old 01-30-2001, 04:36 PM
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Re: MAP Sensor

I don't know how to check them. Which doesn't help, however from what I've heard they are either good or bad.

Try pulling the codes and next time you write include some details as to what your problem is. The guys are real good about "hearing" a problem and giving you a way to fix it.
Hope this helps

cmg
1989, 351, C6, 15x10's and 31's
post #3 of (permalink) Old 01-30-2001, 07:15 PM
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Re: MAP Sensor

The Haynes manual ($12 at any parts store) gives the test procedure for most of the electronics on the engine. The MAP test procedure involves testing between each pair of the 3 terminals with a multimeter, so it's almost impossible to describe in text - you need the illustrations in the manual.

Steve
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post #4 of (permalink) Old 01-31-2001, 06:27 AM
 
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Re: MAP Sensor

My 92 351 W uses a map sensor which produces a frequency from 220 hz to 100 hz. this variation tells the computer about the load condition. The manual says it a voltage but it lied to me.

If I unplug the vacuum to the sensor the truck will run very poorly. And with the engine off and then pull the vacuum line off and try to start the engine it will not have enough timing to start.

I tested mine with 12 volt power supply, a hand vacuum pump and scope. really suck without a scope.

Good luck

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