Finding and cleaning EGR valve on 1998 Mercury Sable.

Tiny
LACKEYR
  • 1998 MERCURY STATION WAGON
  • 6 CYL
  • FWD
  • AUTOMATIC

Confirmed that this is why engine light is on. I'd like to clean it out.

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Monday, November 29th, 2010 AT 8:54 PM

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Tiny
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What I the exact code number being set?

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Monday, November 29th, 2010 AT 9:03 PM
Tiny
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Don't have the receipt in front of me, but it was low flow EGR, I think P0401

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Monday, November 29th, 2010 AT 11:12 PM
Tiny
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That's not a dirty EGR valve. That's either a bad DPFE or a plugged EGR passage through the intake.

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Monday, November 29th, 2010 AT 11:16 PM
Tiny
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Thanks. So I could clean it out and/or replace the DPFE? How to clean it? I think I know where the EGR is located - driver's side back of engine, right on top like a mushroom. Not sure where the DPFE is.

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Monday, November 29th, 2010 AT 11:22 PM
Tiny
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Differential Pressure Feedback EGR sensor also called a pressure transducer. They fail by the hundreds.

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Monday, November 29th, 2010 AT 11:24 PM
Tiny
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Ok, so what do I do next?

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Monday, November 29th, 2010 AT 11:26 PM
Tiny
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Well, if you don't want to get it diagnosed properly, I'd try a new DPFE

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Monday, November 29th, 2010 AT 11:38 PM
Tiny
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What about the cleaning? I've seen responses suggesting wire insertions and chemical breakdowns (B-12). I'd like to do this myself because it seems so simple, as is buying a new DPFE. I think I should do both, no?

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Tuesday, November 30th, 2010 AT 12:09 AM
Tiny
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BTW, I've gotten the same response before - replace the DPFE. This just doesn't seem to fix the problem. If there's carbon buildup, then I think it should be cleaned out. How to do this is the question. With a clothes hanger or with B-12 or something like it. Hey, I don't know what I'm doing, and that's why I'm here. There's mention of gasket replacements, throttle body cleanouts, hose replacements, etc. I'd just like a straight answer.

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Tuesday, November 30th, 2010 AT 12:21 AM
Tiny
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I've given you one. It's your choice if you want to listen.

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Tuesday, November 30th, 2010 AT 12:23 AM
Tiny
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Thank you and I meant no insult. I just can't wrap my head around a carbon build-up problem and a sensor problem. Could it be that both need examination? I'm just trying to avoid future repairs. Again, I thank you.

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Tuesday, November 30th, 2010 AT 12:30 AM
Tiny
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I've repaired this code hundreds of times. The DPFE will cause a PO401 80% of the time on a Ford.

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Tuesday, November 30th, 2010 AT 12:33 AM
Tiny
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So, I removed the throttle body and found a mountain of carbon blocking the EGR passages. Every single intake was clogged. After a thorough cleaning, the light stays off and the engine continues to run fine.

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Tuesday, December 14th, 2010 AT 11:53 PM
Tiny
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It just makes so much more sense to clear out a passage than to replace a detector valve. After all, which builds up gunk and fails as it was designed to first?

It's easy to remove the throttle body and clean out the plate and the passages. Believe me, this is the first time I tried to do it and it was easy with a $20 Kmart socket set.

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Wednesday, December 15th, 2010 AT 12:18 AM

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