1997 Subaru Legacy SUBARU P0400 EGR FLOW MALFUNCTION

1997 SUBARU LEGACY
175,000 MILES • 4 CYL • AWD • AUTOMATIC
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COMET60
  • MEMBER
  • 2 POSTS
I KEEP GETTING CHECK ENGINE LIGHT AND P0400 EGR FLOW MALFUNCTION. SINCE I HAVE 2 OF THESE CARS, I WAS ABLE TO SWAP PARTS READILY. I HAVE TRIED THE BACKPRESSURE TRANSDUCER, EGR VALVE, AND EGR SOLENOID. I HAVE CHECKED THE STEEL LINE THAT COMES FROM THE HEAD FOR OBSTRUCTIONS AND BLEW OUT ALL OTHER EGR PASSAGES. WHEN YOU FIRST INCREASE THE RPM FROM IDLE, YOU CAN OBSERVE THE EGR PINTLE MOVE TO OPEN FOR 2 OR 3 SECONDS AND THEN IT SNAPS SHUT AGAIN AS IF THE PCM DECIDED THAT THE EGR NEEDS TO BE CLOSED AND REMOVED THE CONTROL GROUND FROM THE EGR SOLENOID.
Apr 25, 2008 at 10:45 AM
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CATCANDO_1
  • MEMBER
  • 1 POST
I'm having the same problem the light will go off for a while then come back on. According to Hayne's manual EGR working properly.
Jun 10, 2008 at 12:52 PM
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