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Old 02-13-2008, 04:22 PM   #1 (permalink)
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How to test MAP sensor??

Anyone have the skinny on how to test a MAP sensor?? I've seen several posts talking about the MAP sensors causing the mpg to drop. Mine seems to be doing the same thing for no obvious reason. Like to know how to test it before buying one.
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Old 02-13-2008, 04:38 PM   #2 (permalink)
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Anyone have the skinny on how to test a MAP sensor?? I've seen several posts talking about the MAP sensors causing the mpg to drop. Mine seems to be doing the same thing for no obvious reason. Like to know how to test it before buying one.
If you don't have a scanner ,, try unpugging it ...Have you checked the fuel pressure ?...
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Old 02-13-2008, 05:30 PM   #3 (permalink)
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No, haven't checked the fuel pressure. Have a new pump (less than a month old) and have shimmed the fpr.
If I unplug the sensor will it set a code??
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Old 02-13-2008, 05:41 PM   #4 (permalink)
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Try spraying some electric contact cleaner inside the Map sensor where the hose goes on. It seemed to have decreased the black smoke on mine. I don't know about Mpg's yet because Its been so cold here lately there's no point driving around wasting fuel just to test it out. I might buy one too. I priced them at Powerstroke shop for $ 127 plus shipping. I will look in a junkyard too apparantly the I-6 Econoline has the same sensor as me. part # F4TZ-9F479-A
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Old 02-13-2008, 06:01 PM   #5 (permalink)
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No, haven't checked the fuel pressure. Have a new pump (less than a month old) and have shimmed the fpr.
If I unplug the sensor will it set a code??
Yes , but it won't hurt anything while testing
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Old 02-13-2008, 06:53 PM   #6 (permalink)
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I will look in a junkyard too apparantly the I-6 Econoline has the same sensor as me. part # F4TZ-9F479-A
Before rushing out to your local boneyard to find the Econoline version (or just another MAP sensor), you might want to read this: "TSB 94-23-15, LOSS OF POWER - 7.3L DIRECT INJECTION TURBO DIESEL - INCORRECT MAP SENSOR".

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Old 02-13-2008, 08:52 PM   #7 (permalink)
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Originally Posted by action4478 View Post
If you don't have a scanner ,, try unpugging it
And what are the symptoms if you unplugging it to see that it is bad? changes something in the idle, WOT, or what?
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Old 02-14-2008, 12:21 AM   #8 (permalink)
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And what are the symptoms if you unplugging it to see that it is bad? changes something in the idle, WOT, or what?
The drivability should be different.
If the map sensor is unplugged the pcm will default to a set value.
If the map is bad and sending the wrong data to the pcm it usually shows in poor acceleration.

Usually when complaints about poor acceleration came up testing the map sensor was one of the things most checked. It seems just recently that people are saying the mpg improved when they replaced the map sensor, but they were not complaining about any drivability issues. So I don't know if its a direct relation, or they just didn't notice any poorer performance.
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Old 02-15-2008, 08:24 PM   #9 (permalink)
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Originally Posted by STurbo90 View Post
The drivability should be different.
If the map sensor is unplugged the pcm will default to a set value.
If the map is bad and sending the wrong data to the pcm it usually shows in poor acceleration.

Usually when complaints about poor acceleration came up testing the map sensor was one of the things most checked. It seems just recently that people are saying the mpg improved when they replaced the map sensor, but they were not complaining about any drivability issues. So I don't know if its a direct relation, or they just didn't notice any poorer performance.
Thanks a lot, and yes I have read that about the MPG, and Im having poor MPG and not any poorer performance, thats why asked that. Im going a try, unplugg the MAP sensor and let see what happens.
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