DPFE code (what is this?)

[davidz]

Can someone help me identify a prob code. I ran KOER/KOEO and one code was a 327 which relates to dpfe circuit or sensor. I can't seem to locate this and am tired of the ck engine light one. (perf is ok though) Anyone have a clue?

93 atx/117k Thanks Davidz

 

[SilverSHO]

DPFE = differential pressure feedback EGR, I believe. 327 indicates DPFE output circuit below minimum voltage. So something in your EGR system is out of whack. Other than that, I'm not much help.

 

[sdpatt]

The DPFE sensor is the aluminum "pack of cards" shaped box mounted to the driver side of the rear intake manifold plenum. It is connected to the EGR riser tube by two rubber hoses. It detects the pressure difference between exhaust system pressure with the EGR valve closed and the lower perssure after the EGR valve opens to the intake's vacuum.

The 327 code indicates that something internal to the sensor or its electrical connector is not working properly. The 326 code that you didn't get would indicate the pressure measured by the DPFE sensor is low. That would point to a possible leak in the EGR tube or non-closing EGR valve. Your problem is electrical, not mechanical.