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Explorer, Sport Trac, Mountaineer & Aviator 1991-1994, 1995-2001, 2002-2005, 2006-2010 Ford Explorer

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Old 08-29-2006, 12:02 PM
tmm66 tmm66 is offline
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What caused the DPFE sensor to melt?

I have a '99 EX with the 6 cyl OHV motor. I found the HIGH port on the dpfe sensor was melted and the hose that connected to it was severely cracked. I replaced the sensor and hose but would like to know the root cause of the problem. Any suggestions?
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Old 08-30-2006, 08:08 AM
renchr56 renchr56 is offline
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The exhaust tube may be plugged with carbon. you will have to pull it & find out.
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Old 08-31-2006, 11:56 AM
tmm66 tmm66 is offline
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I'll try it hopefully this weekend. If this tube was clogged, wouldn't this cause the "check engine" light to come on? Just wondering...
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Old 08-31-2006, 12:39 PM
renchr56 renchr56 is offline
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depends on if it is clogged all the way or not
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Old 09-05-2006, 01:56 PM
tmm66 tmm66 is offline
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The tube was not clogged at all. The hose from the HIGH port did show signs of carbon buildup. We'll keep an eye on it.

thanks,
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Old 09-06-2006, 11:31 AM
BowTieHatr BowTieHatr is offline
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the sensor it self shorts out and over heats. seen a few of these. atleast you did not have to replace your intake
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Old 08-12-2012, 02:42 PM
George M Baxter George M Baxter is offline
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Sorry your all wrong!

In normal operation there is no gasses traveling through the tubes. This device measures deferential of pressure. But as you stated the hose had cracks (leaks) This aloud the hot gasses from the Exhaust to flow through the hose to the DPFE sensor melting it. A clogged line would not melt the sensor but would make it inoperable.
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Old 08-12-2012, 03:05 PM
George M Baxter George M Baxter is offline
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More info

Witten by wildbill a person that worked for the company that designed and manufactured the sensor for Ford Motor Corporation.

Exhaust stream does not pass through this transducer(DPFE) the pressure applied to the sensor is a dead head so the thermal transfer is contained to the stagnant air trapped in the hoses to the sensor that is very slow to transfer heat.
The plastic housing was to reduce cost of this transducer(DPFE) not to dissipate heat in fact the plastic transducer would melt with pressure leaks.
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Old 08-12-2012, 03:05 PM
 
 
 
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