Hello! I need some opinions/help on an issue with the wifes 92 accord please. The car stumbles on initial acceleration off idle, then runs smooth. At cruise speed at around 2200-2800 rpm, the car surges and feels like it's missing slightly. If you apply more pedal, it stops and accelerates fine. I have replaced the plugs, wires, cap, rotor, and fuel filter. Timing is dead on at 15 deg btdc at idle. I was going to start tearing into the sensors with a VOM, but thought someone here may have ideas on what the poblem may be. Thanks for the help.

 

Your description sounds like the EGR ports might be getting clogged up.
A quick test for clogged EGR ports; Warm up the engine to full temp, then 'power brake' the car to around 1700 RPM. If you feel the stumble, the EGR ports in the intake manifold will need to be cleaned out.

 

Thanks for the reply. I tried the power brake thing and the car didn't stumble or miss. I then removed the EGR valve and the diaghram movement is free and is not leaking or losing vacuum. The 2 EGR ports in the intake looked ok. Any other ideas? Also, there are no codes stored in the ECM.

 

disconnect the vac line to the egr vale and see if the stumble goes away.The diafram might be working ok,but the ports inside the manifold can be clogged,you cant see them

 

You guys are amazing! I disconnected the vacuum from the EGR valve and plugged it coming from the vacuum control box and the stumble went away! I think I understand the function of the EGR valve from my Haynes manual, but i do have a few more questions:

1- If the valve/intake ports are clogged or not functioning, wouldn't that just keep from re-circulating exhaust into the intake charge? Shouldn't the O2 sensor compensate for that?

2- Why does this cause the engine to stumble, is it running on a rich condition?

3- Are there any workarounds, or am I going to have to remove the intake to properly clean the port. I would think if I tried to clean it installed, I would knock a bunch of debris into the intake tract?

4- bill-71SS, are you a member of chevelles.com? Just guessing by your username.

Thanks for the help. VERY much appreciated!

 

Any ideas on what I can do? Thanks.

 

yyes I am a chevelle .com member,but I drive a 71SS big block Nova,good guess.I work on honda's for a living,have now for 30 years at a dealer.You do not have to take off the intake,look under the fuel rail on top of intake,you will see a bunch of small welch plugs,drill a small hole in them and use a dent puller to take them out.Clean the ports with a piece of coat hanger,make sure you get the rod all the thru the carbon

 

The car stumbles because not all of the E.G.R. ports are not plugged up, that is precisely why it stummbles. The car is designed to accept E.G.R. gasses while cruising at a steady pace correct.

All but one E.G.R. port is plugged up and 100% of the E.G.R. gas is being drawn into one, not fully plugged, port practically killing that one cylinder.

There are topics on how to clean E.G.R. ports in the archives with pics, check them out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wifes92accordlx &raquo;</TD></TR><TR><TD CLASS="quote">You guys are amazing! I disconnected the vacuum from the EGR valve and plugged it coming from the vacuum control box and the stumble went away! I think I understand the function of the EGR valve from my Haynes manual, but i do have a few more questions:

1- If the valve/intake ports are clogged or not functioning, wouldn't that just keep from re-circulating exhaust into the intake charge? Shouldn't the O2 sensor compensate for that?

2- Why does this cause the engine to stumble, is it running on a rich condition?

3- Are there any workarounds, or am I going to have to remove the intake to properly clean the port. I would think if I tried to clean it installed, I would knock a bunch of debris into the intake tract?

Thanks for the help. VERY much appreciated!</TD></TR></TABLE>

Here is a VERY descriptive how to: http://home.comcast.net/~em-engineering/T2T013.pdf

Hope that helps

To answer some of your questions:

1. The whole purpose of the EGR is to recirculate the exhaust gases back into the intake thus reducing emissions, your o2 sensor will compensate slightly but it also relies on the egr to 'clean' up things.

2. It stumbles because you're trying to force that gas back through 1 port instead of 4-8 ports (depending on model, engine etc), it will stumble very easily.

3. Check the DIY I posted . (its not mine to clear up any confusion ).

Here is the link for part numbers for the egr ports: http://www.slhondaparts.com/se...17199


Modified by .ken at 5:01 AM 8/13/2005

 

.ken,

Is this from your own computer, I know T2T, he had a heart attack and gave up his shop and I think he is teaching and has a password type members only website, the best in my opinion on Hondas. I have been trying to find his info out in the free world. PM if you like.

 

pm'd