i did my KOEO/CM codes today at school , i got 41-lean condition and 33 insufficent egr flow. my teacher said the 41 is probably my o2 but im not sure about 33, do i need a new EGR valve? help would be much appreciated

 

33= EGR valve opening not detected, which usually causes 41. It could be the EGR valve, but it could be the EGR solenoid or the wires and vacuum to it.

 

is it possible to figure out what it is? i know if i unplug my EGR sensor nothing happens, is that normal?

 

Check for vacuum in and out of the solenoid first. Out won't always have vacuum but if you work the gas you should feel it sometimes. With a vacuum pump you can check the EGR valve.

 

i checked the EGR with a pump today, i can see the piece inside moove up when i put vacume on it, should i check the vacumel line next or try a new selinoid?

 

Maybe you missed this post. Sometimes you need to slow down and really read a post to digest what is being said. His post instructs to deal w/ and test the solenoid up line from the Valve first. That being said, in addition to checking the solenoid, I would suggest removing the EGR valve, cleaning it & the air intake port ways where it mounts for obstruction & it's easier to check it's actuator diaphragm for leakage while it's off. At Idle, the ERG vale should be closed so the EVP sensor could probably care less if you disconnect it. If you were riding in the engine compartment and accelerating, it might be a different story. But "we" wouldn't do that, would "we"! The EGR supplies secondary air. so it seems strange that lack of extra air would cause a lean condition, but that secondary air also cools the combustion chambers to inhibit uncontrolled detonation. Checkout this link for further enlightenment &/or confusion:http://fordfuelinjection.com/?p=43

 

yea i did miss that, sorry. where is the solenoid?

 

Follow the Vac hose that feeds the EGR Valve. That's what supplies Vac to the EGR valve. "JCMS" explained the regulators normal behavior. Here is a link for more info: http://fordfuelinjection.com/?p=43

 

okay, so once i track it down, unless someone can tell me were it actully is, if it is bad where can i get a new one, i've already looked for it on a few sites including autozone and none have it

 

On my 4.9 it's on the drivers side rear of the valve cover. Just follow the vacuum hose from the EGR valve to the solenoid.