EGR not working?

1994 FORD RANGER
200,228 MILES • 6 CYL • 2WD • AUTOMATIC
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ERERERT
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1994 FORD RANGER. CODE 332 INSUFFICIENT EGR FLOW DETECTED SHOWING ON MY SCANNER (AUTO X-RAY 6000), ENGINE STARTS FINE, WHEN WARMING STARTS TO STALL AND SURGES, WHEN UP TO TEMP, RUNS WELL BUT LIGHT COMES ON. MANIFOLD VAC@16lb, EGR WORKING, INTAKE PORTS CLEAN (LITTLE WET), NEW EGR VAC SOLENIOD, NEW BACK PRESSURE SENSOR, NEW IAC,NEW COMPUTER,VAC LINES GOOD. DON'T KNOW WHERE ELSE TO LOOK
Oct 26, 2010 at 3:06 PM
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WRENCHTECH
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If you have already replaced the backpressure sensor, then you likely have a plugged passage in the throttle body. It has narrow spots that will plug up with carbon.
Oct 26, 2010 at 3:16 PM
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I REMOVED THE EGR VALVE AND AIRDUCT, AND CLEANED OUT PORT TO PLENUM , IT APPEARED TO BE CLEAN, EXAUST TUBE TO MANIFOLD OPEN
Oct 26, 2010 at 3:39 PM
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WRENCHTECH
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With the engine idling, apply vacuum to the EGR valve and see if the engine tries to stall. If not, the passage is still plugged.
Oct 26, 2010 at 3:47 PM
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ONE OF THE FIRST THINGS I TRIED, ENGINE STALLS
Oct 26, 2010 at 4:04 PM
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WRENCHTECH
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Does the EGR hold vacuum when applied?
Oct 26, 2010 at 4:26 PM
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EGR DOSE HOLD VAC,CHECKED CONTINUITY BETWEEN EGR VAC SOLENIOD AND COMPUTER , ALL IS GOOD, NOT SURE WHEN VAC IS APPLY'D ? I KNOW ITS NOT CONSTANT
Oct 26, 2010 at 4:43 PM
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WRENCHTECH
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You may have a defective DPFE. They have a very high failure rate. You'll need a scan tool to see what it's doing.
Oct 26, 2010 at 5:11 PM
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I CAN UNDERSTAND A NEW PRODUCT BEING DEFECTIVE, BUT WHAT ARE THE ODDS OF A NEW DPFE UNIT BEING BAD ?
Oct 26, 2010 at 5:40 PM
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WRENCHTECH
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Probably about 25%.
I'm not suggesting to change it. You just need to test it.
Oct 26, 2010 at 6:12 PM
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THANKS, I'LL TRY TO TEST THOROUGHLY TOMORROW.
Oct 26, 2010 at 6:59 PM