now to solve 4 codes, 172 bank 1 o2 sensor not switching, 332 EGR insufficient flow, both KOEO, and 311 and 332 both KOER then she should be back to normal operation!!

EDIT:

ok not sure what happened with posting originally, did the post from my iphone...oh well, here goes.

need help solving the listed codes, 172 and 332 are the KOEO codes, and I know im dealing with egr, however im not sure what it means by the insufficent flow, which Im assumeing indicates something is blocking the flow, but im not really sure to what, I have not done any thing to the truck except a spark plug wire change and plug change, so what is going on here? is the EGR easy to find and access? and if so what should it look like, so I can try to check and see what could be blocking it...also want to solve the other two codes soon if able, thanks.

 

bump...10 characters

 

332 and 311...I would look for vacuum leaks. I too have a 311 currently I am going to replace all that plastic ****. What engine do you have? I had a 172 and a 334. I just went ahead and pulled the egr valve, Pulled the sensor from the top of it off (note how it was installed. not sure if it makes a difference) and cleaned it all up. I also went ahead and replaced the o2 as the one that was on it looked original. I no longer have a 334 or 172 code. But I have a 311.

 

its a 5.0L 302Cu, AAuto trans (forget which I have at the moment, will look it up if needed, but its 4RW70 or something odd like that...do you have a picture of where the EGR is located, and how to get to it?

 

Your EGR valve may look like this:


Or this:


I suspect the latter because it has the EVP (EGR Valve Position) sensor on top of it. I think 1996 was the first year for DPFE style EGR sensing, which is EGR flow based instead of positional.

Two completely different styles of EGR feedback that have vastly different troubleshooting steps for Code 332.

 

Thanks, I had a feeling that might have been it but wasn't entirely sure!! now I know what it is, I believe IIRC its the second picture, so Ill take a look and try cleaning it when im home tomorrow or monday and see if that helps any.

Any recomendations of way to clean the little turd?? whats a good way to clean it with out causeing harm to it? will Dawn and water be ok to use or is there any thing you guys use that would be better?


again thanks!

 

I have used a screwdriver and carb cleaner to knock off the built up crud inside the EGR valve.

If indeed your EGR setup is position based, EVP, then the Code 332 means this: EGR valve opening not detected.

This has nothing to do with flow, it's strictly whether or not the EGR is opening as sensed by the PCM. A stuck EGR valve, faulty or disconnected EVP sensor, faulty EVR or a missing vacuum line are common root causes. Add in a missing and/or leaking vacuum reservoir.

Apply some vacuum directly to the EGR valve to see if it moves. Also stick a DVM on the EVP output to see what the closed and open output signal values are.

For reference: Fuel Injection Technical Library » EGR Valve Position sensor (EVP)

 

ill give that a shot, as for DVM i assume you mean a Digital Voltage Meter, or are you meaning something different?? also to apply vacume directly should I just hook it to the coffiee can or what? im going to try some carb cleanner, whats the simplest way to clean it? just dip it in and wipe with a rag?

 

Bump, can I just dip the egr into some break cleaner, or other cleaning fluid? What's the best way to clean it up?

 

DVM= Digital Voltmeter

I stated before to use some carb cleaner and a screwdriver if it is really gunked up. Brake cleaner may work.

I would not dip or soak the entire EGR valve in cleaner. Spray into the ports where the exhaust gasses pass through.

As far as applying vacuum to the EGR, apply it directly to the EGR valve itself.

 

yes you did, your correct, thats also what I meant, my bad, thanks, will give it a try and see what happens.