1999 Honda Accord EGR ?

1999 HONDA ACCORD
154,000 MILES • 6 CYL • 2WD • MANUAL
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KEGELMTA
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The check engine light was on on a 1999 Honda Accord. My code checker said the only problem was an error code P1491 and my repair manual for this vehicle said that the "EGR valve lift was not sufficient". I removed the EGR valve and performed a continuity check on it that is described in the repair manual (check for continuity between terminals 1 & 2 and terminals 1 & 3 of the EGR valve). There was no continuity (i.e. the circuit was open) on both 1 & 2 and 1 & 3. The book said the EGR valve needs to be replaced so I put a new on. The P1491 code is gone but another code P0401 (EGR flow insufficient) has popped up. I checked the ports that lead to the EGR valve and there doesn't appear to be any significant carbon accumulation or blockage in the ports as far as I can tell. Any ideas what might be causing the P0401 error code? BTW, The car runs very well, both before and after the EGR valve was changed and I checked the continuity on the new valve and according to the manual, it checked out fine.
Thanks, Tom PS I'll have anoter question for you about another car shortly.
Jun 29, 2010 at 4:38 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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KHLOW2008
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Hi Tom,

Thank you for the donation.

For the year model, it is a known problem with the EGR insufficient flow. The passage under the EGR valve is partially clogged andd this would result in the error code. You would have to get the passage cleaned.
Jun 29, 2010 at 12:34 PM
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KEGELMTA
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What is involved in cleaning the exhaust passage? I stuck wire tie down the passage about 5 inches and it didn't hit any resistance. I hope I don't have to take the $#@%^ing head off to clean the exhaust passage....
Jun 30, 2010 at 6:01 AM
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KHLOW2008
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You need not remove the head but it involves removal of the manifolds.

I have emailed the TSB with the repair procedures to you. If you do not receive them within a short while, please provide alternative email address as I do have problem sending mails to some domains.
Jun 30, 2010 at 9:27 AM