Odd sound / find.

[Malone94Ltd]

Hoping someone can help me out with this and that I didn't damage my X.

Recently I was driving and passed a car. Before I knew it the RPM's were upwards of 4k-4.5k. Shortly afterwards I noticed the X had a bit more growl to it.

I checked to make sure that I hadn't caused an exhaust seal leak. The exhaust sounded fine, but anytime I put a little bit of load on the engine it just sounded a bit more "mean" than it should.

I stopped by my buddies shop and we tossed it on the lift, he couldn't locate any exhaust leaks either. He popped the hood and low-and-behold... found a hose that was not attached. I'll attach the pictures. It was the right hose of the two, but as you can see... it seems whatever relay this is overheated as well. Anyone know what this relay is for?

 

[Turdle]

That is a DPFE sensor--

 

[TequilaSnrs087]

Yep, for whatever reason, your DPFE blew up. They fail all the time, but I have never seen one fail like that. Usually they just set off the CEL and you throw on a new one.

 

[Malone94Ltd]

Very odd... the check engine ight never came on, wonder if it's burned out. I also didn't notice and change in performance or anything. What does the DPFE sensor do?

 

[urbanistic]

Quoted from alldatadiy...

The differential pressure feedback EGR sensor is a ceramic, capacitive-type pressure transducer that monitors the differential pressure across a metering orifice located in the orifice tube assembly. The differential pressure feedback sensor receives this signal through two hoses referred to as the downstream pressure hose (REF SIGNAL) and upstream pressure hose (HI SIGNAL). The HI and REF hose connections are marked on the aluminum differential pressure feedback EGR sensor housing for identification (note that the HI signal uses a larger diameter hose). The differential pressure feedback EGR sensor outputs a voltage proportional to the pressure drop across the metering orifice and supplies it to the PCM as EGR flow rate feedback.

There are two types, an aluminum case one, and a plastic one.

 

[bluesman2333]

What does the DPFE sensor do?

The DPFE sensor controls the EGR solenoid which controls the amount the EGR valve opens. The EGR valve vents exhaust gases back into the engine to control combustion temperature and limit it to 2500 degrees. This reduces NOX emissions but slightly limits performance. I have no idea how the system knows when the temp hits 2500 degrees, but it does I guess.

The original hoses were silicon but I replaces mine with regular rubber and will check periodically to see if they ago south.

 

[Turdle]

On the egr "tube" are 2 reference lines. between these line outlets is an orifice, which creates a differential in pressure. The DPFE senses this and assumes proper operation

These pictures are my home made EGR tube-made from 2 tubes--