Insufficient EGR Flow
 

Hi my CEL has been on for a while. When my mechanic plugged in his error code reader. It read "Insufficient EGR Flow." He told me it was probably clogged up but it was good to drive and did not require attention right away. A few months have went by and I've been driving casually with this light on and I ask him again if I should try to fix it yet. He told me i dont have to worry about it yet because it doesn't effect the car's performance or the car itself in any way. And it just effected emissions. I was just wondering how much would it cost to repair this? Would it be easier and more worth it to just DIY, should I send my car to another mechanic? How much around would it cost to fix or should I just leave it. Thanks

01 Prelude SE

you will need to fix it sometime before your next AirCare.. because if you leave it too late.. the OBD won't have enough data, you will still get a fail.

An EGR valve retails for about $270. It is easy to DIY.

Also this returns at the top of the Google Search http://www.hondaprelude.to/forums/sh...your-EGR-Valve

Or u pull it apart and clean it out. Could very well just be carbon-ed n the diaphragm is sticking. Do that before u dump $300 on an egr u may or may not need.
Posted via RS Mobile

Sounds like EGR ports are plugged. We don't really see much problems with the EGR valves themselves on the preludes.
There's 6 ports that have to be drilled out and cleaned. Then have to be capped off. Fairly common on these preludes and older accords

:bigthumb:

Just did EGR delete on a 99 prelude. No CEL so far. Been running for a few days now. Car runs fine.

Sorry if this seems like a noob question, but whats "EGR delete"? Did you send it to the recycle bin?
Posted via RS Mobile

It means fooling the ECU into thinking that EGR is working ok so that it does not throw a CEL.

sorry for the dumb questions but, how do you fool the ecu in regards to the egr?

You are a Honda tech aren't you. Sorry but I will answer your question with a question:

How does the ECU control the EGR valve?

Hint:
Trace the flow diagram of the following components and create a schematic: ECU - EGR Soloniod - EGR valve/Sensor

Once you figure out how these components work together you will know the work around...

i'm fully aware how the egr ecu system works. Not doubting it that it works, just wondering how its done. I'm looking at the diagram but still stumped:confused:

here ya go....