nightrider1

I got a question about my engine.I have a F23A4(ULEV) engine i swapped in to my '98 Ody.Anyways,a few days ago I was gonna clean the EGR ports to see if that fixes the hesitation while accelerating,it happens like twice a week,mostly in morning when cold.The problem is that when I was looking for the EGR port plate on the intake runners,I swear I didn't see it.I moved the fuel rail out of the way so it would be easier to spot but it wasn't there.It got me wondering if this engine even has EGR ports.I was gonna try just cleaning the EGR valve but those 2 bolts were so damn tight I couldn't loosen them up.Is there anything else that could be causing the symptoms my Ody is having?Thanks

PilotOnDubs

iTrader: (6)

i think you have to drill the intake runners yourself and then cap them off when your done

redbull-1

The 6th generation Accords (e.g. F23A4 engine) 4 cylinders did not have a coverplate for the EGR passages like the previous generation. The EGR port that usually clogged is circled in this image.

nightrider1

So it looks like I have to remove top part of intake manifold with the throttle body.Awe man,that's gonna be a b***h to get to,but it has to be done.Any tips on removing it since its my first time doing this?Thanks for the info guys.

ns-export

Hey, can you let me know how it goes if you try this -- I've got a hesitation on accel with my Accord and wondering if it's the same thing.

Looking at the diagram it seems like there are no individual runners to get clogged up with this engine, which seems like a good design, except it seems less likely that it would be causing my miss since that one port that gets clogged would just mean no exhaust gets into the intake at all...

Dannyvho

To prevent air leaking into the intake you will need new gaskets (parts 11 and 15 in the picture) whenever you remove the EGR valve or the upper part of the intake manifold.

redbull-1

Your hesitation on acceleration problem may be due to an incorrect base engine idle (i.e., mis-adjusted base idle adjustment screw)

or

Due to an oil level or oil supply problem which causes the ECM/PCM to order fuel cut-off because of low or delayed engine oil presuure to the VTEC system.


For informational purposes regarding the 4 cylinder EGR port, this other thread pictures shows a clogged EGR port and has information on the 6th gen Accord 4 cylinder:

http://www.driveaccord.net/forums/sh...ad.php?t=31865

ns-export

Thanks for that, those pictures answered some of my questions. I suppose I could check if my EGR port is clogged or not by whether or not I have vacuum at the EGR valve end of the port.

I hate to hijack the OP's thread, but as far as the idle screw goes, what is the proper method to set the base idle? Mine is idling well, and around 750 +- 50 rpm, but I suspect the ECU will correct it if the screw is not set ideally up to some limit?

My oil is changed regularly and is up to the full mark on the dipstick, so hopefully it's not that.

Looking with my scan tool I see that my long-term fuel trim is at -10%, and I wonder if that is a clue.

The fact that disabling the EGR system (which leans the mix as I understand it) almost completely cures the hesitation makes me wonder if the O2 sensor is reading overly rich, causing the ECU to lean the mix too much (-10% trim), which is made even worse as the EGR gases are introduced under part throttle, resulting in the stumbling...

accord99power

why is this narrowed down to only the EGR port being clogged? Plug wires made me stumble on acceleration. Loose O2 sensor wire gave me hesitation on acceleration as well. i would look at all symptoms of hesitation on acceleration. I would google it first and go from there beofre performing the egr job.

digitalreality

100% ACCURATE!!!! I too had the P0401 insufficient flow detected code and had to remove the intake plenum and clean out this one port. That's it! Code is gone now and the car runs beautifully. btw I have a 1999 Honda Accord 4 cyl. ULEV. It isn't too bad to have to take the Air intake plenum off and clean the port all the way up to and including the EGR valve. If anyone needs help feel free to email me. take care guys and keep up the excellent posts!