Replace or clean EGR?

Original Poster: Did you mean the valve itself? Or only the ports and passageways?

I have a follow-up question for the masses out there: I had the same prob where insufficient EGR Flow causes this P0401 code and we know the fix for it, but I was told that over time if not remedied it will fail the EGR valve...on the other hand I've also been told that these EGR valves pretty much never fail? Well do they? And is this true?

Kev> bbtaco wrote:

Thanks

But I don't think I'll go through all of that, especially the drilling. Looks a little beyond what I think I'm willing to go through, I may just use these instructions to get at the valve itself and try cleaning it out with some pipe cleaners and a little carb cleaner. Vehicle went 170k without being drilled, a good cleaning should buy me a lot more time.

But the detailed instructions on what they do are there, so it's a good start.

Well I'm not really sure. I only have the error code and what the Service Bulletin says to do as a reference at this point. Based on the wording of the error messsage, "Insufficient airflow" I would take that to mean the ports and passageways. I guess when I get in there we'll see how hard it is to clean.

Well I went 170k without that service ever being performed. We'll see what condition the valve is in after I attempt to clean it.

That is why I sent the link, you mentioned possibly trying to do it yourself. Our '99 Accord had this done at around 70,000 miles by the dealer's service department.

cleaning the valve may help a little, but the core of the problem is the carbon buildup in the manifold, and drilling /is/ the factory solution.

Before you start drilling, make sure the EGR valve or control unit isn't having problems. Insufficient vacuum or a leaky diaphragm might produce the same code. (I don't know that for sure!)

Basic troubleshooting is straightforward. Get one of those hand vacuum pumps with a vac meter. Insert a 'T' fitting and monitor the the vacuum being provided to the valve while the car is in motion. Then remove the valve and use the pump to pull vac on the unit. Observe its motion, and watch for leaks. Note how much vac is required to lift the valve, and compare to the control box output. The system may not need full lift, but the valve should be at least partially open when the car is running.

Also, check the rate of vacuum application. I chased my tail for several weekends troubleshooting a constricted EGR solenoid passage. The vac would arrive, and the valve would get opened, but not quickly enough to keep the ECU happy.

If all this is working, then start thinking about drilling and reaming....

-Greg

Is the procedure essentially the same for a '98 Odyssey EX?

Excuse me...

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