Map sensor - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 05-08-2013, 06:29 AM Thread Starter
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Map sensor

So here's my problem, I changed my map sensor out last night and this morning I notice a big power loss. Why would a new map sensor cause power loss?
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post #2 of 5 Old 05-08-2013, 07:53 AM
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The new one can be bad right out of the box. Also, if you haven't changed the rubber line at all it may have cracked when you were moving it around and now you have a boost leak that keeps the MAP from seeing intake pressure. Also, the rubber line from the factory is held on with a crappy spring clamp. You might have pulled it off the plenum. Do you get your power back with the old MAP installed?



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post #3 of 5 Old 05-08-2013, 08:24 AM Thread Starter
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I haven't tried putting the old one back on yet. I'm at school then I work till 6. So when I get home I will try tht
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post #4 of 5 Old 05-08-2013, 10:12 AM Thread Starter
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I unplugged the sensor and the power came back. So does that mean bad sensor?
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post #5 of 5 Old 05-08-2013, 11:42 AM
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It could be that the new MAP sensor is bad. Are you sure it is the correct MAP sensor (and not something like one for a gasser)? Here's the factory number:

MAP Sensor
(Ford) F4TZ-9F479-A (94-98; digital)

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