Gentlemen I need your help!

as some of you may know I have a 2005 RL currently has 104k miles (bought in 08 with 36k right off lease) I realize I'm on the wrong sub-forum but my problem is strictly Engine related and 2007-2008 TL TYPE S uses the same exact engine (j35A8) so I figure it wont hurt asking, especially that the RL sub-forum is not very big. Just trying to reach more people with the exact same engine and possibly the same failure! (Moderator I have good intentions in mind, eventually a type S owner will have this same problem and will look on this forum, you do not have a thread with this code)

I been having the p0401 EGR insufficient flow code intermittent for a year. I cleaned the EGR valve but it came back. lately (this winter) its been on most of the time so I decided to clean the EGR system, since I'm going through a divorce I am broke and it was ether do it myself or don't do it at all...

The whole process took two long afternoons. I removed the intake access hatch, disconnected all the hoses on the manifold. removed the throttle body,lifted the intake, removed the EGR valve and cleaned the intake, valve and the engine passage with large amounts of carb cleaner. The only difficult task was the throttle body removal as its very tight fit but its doable after removing the air box and hose.
I reassembled everything, reusing old gaskets but cleaning them and the contact surface with carb cleaner.

Good news is car started, p0401 did not come back
Bad news I now have p2413 Exhaust Gas Recirculation Performance/Range problem!!

I need help on how to attack this, please suggest anything as the information on the internet is pretty minimal on this code!

I rechecked all the connections, sure enough one connector was disconnected (controls the butterfly valve that tunes runner length ) but it did not fix the problem. All other electrical connectors as well as hose/vacuum connections are OK (checked everything 4 times)

I did not have any leftover screws, all the assembly went without any obvious issues.

I did dump a can of seafoam into the gas tank when filling it up right after the EGR work (before the engine warmed up and the code came on, I was on E and filled to F) I failed to find any information on seafoam causing EGR failures. I did not perform the typical sucking seafoam into intake procedure. Seafoam is used on Honda engines a lot and someone would had have this problem.

SInce I reused the old gaskets, would a vacuum leak in the manifold/manifold lid/EGR valve cause this error code? should I take it apart again and use some gasket sealer on it?

This code is completely different than other EGR codes that start with 04XX (vs this one 2413)
Why would honda have an extra EGR code in a different batch of codes?

How does the "computer" monitor the EGR performance? looking at the diagrams the only electronic part of the system is the EGR valve. how does the brain now that the flow is insufficient (0401)? or with the current code that is not operating correctly (2413)?
Is everything in the EGR valve? it has 6 wires, 2 operate the valve, 2 monitor valve position but I don't know what the last pair is for.
I don't feel too good about replacing the valve as the code was not previously there, removing and cleaning would not damage it.

should I look into very basic stuff like fuses?

Gents, please help! any advice is greatly appreciated!

 

Let's go back to basics: Have you tried to clear the code to see if it's just an anomaly in the computer. Maybe the ECU noticed EGR levels were drastically different after cleaning and threw a code. p0401 came up for me on my TL and previous on my 99 accord v6 (j30a1), I threw a new EGR at the accord and they had a TSB that involved having a sleeve installed at the EGR port. On the TL, a piece of carbon had been lodged in the EGR valve keeping it open. I cleaned it well with carb cleaner, removed the piece of carbon and no more p0401. I'm surprised you effectively tore up your entire IM for it!


Long story long: clear your code and see if it comes back! KISS: Keep it simple, silly.

You're welcome in the 3g forum! We're all great guys here happy to help each other out!

 

Thanks so much for the reply! I did the same procedure as you with egr valve cleaned but eventually it quit helping.

I'll get the codes cleared out and i'll get back to you guys!

 

NO LUCK!

On my way from work i stopped at a shop to get the codes erased. went home, left the car idling on the driveway for 35 minutes, drove to the gym. No code for close to an hour.

after leaving gym and starting the car again code came back within 3 minutes