code 71 and vacuum lines.
 

Hello fellow 4runner owners, i recently had my valve cover gaskets and pcv valve changed and after all was completed, about 5 miles down the road, the "check engine" light came on. after looking up the flashes, it is determined that it is code 71. Well after examining the work done i noticed that the vacuum lines appeared to be hooked up wrong. I am speaking of the 3 lines, one of which has the orange/black check valve on it. one line has a screw in it, another line is blocked off the plenum, and the third line seems to be fine (orange check valve line)

IF ANYONE COULD TAKE A PIC OF HOW THIS IS SUPPOSE TO BE, I WOULD GREATLY APPRECIATE IT. MY TRUCK HOWEVER RUNS PERFECTLY NORMAL.
heres a diagram

(line with a screw) * * (orange check valve on this line
* (line blocked off at plenum)
These lines are just behind the egr valve, next to cruise control.

The vacuum diagram under the hood doesn't help me

I have some pictures at home from my rebuild, so I'll post them tonight. It's a lot easier if you still have the vacuum lines with the numbers on them. Not sure it any of the lines you describe affect the egr system though.

FYI: I got a code 71 from not tightening all the nuts and bolts on the egr pipe properly so air could go in and cool down the exhaust just enough to give the code.

Just remove the EGR, plug the lines and push a resistor into the sensor coupling.....if you want to try it. Your EGR isn't "completely" necessary if you don't live in an area with smog tests. I removed mine and I'm completely happy with the results.
Do a search on "EGR valve, code 71 or blocking off EGR" and read the threads and see what you think before making your decision.

I vote against EGR removal. It isn't enough that people think we are a bunch of hooligans tromping in the wilderness but now we pollute while we are out there. Search for 93 pickup FSM - one of the members has posted the FSM that shows the vacuum lines. My orange and black check valve cracked so I just used a fitting to hook it up straight thru. I have the resistor in the wiring since my temp sensor isn't working but that shouldn't effect my emissions.

autozone.com has vacuum diagrams on their website.

why not take it back and make them fix it? Im sure they screwed up the vac lines

Isn't there an emissions sticker under the hood indicating the emissions componenets and vacuum line routing and placement. Should be.

Yellowtruck - Disconnecting the EGR is illegal. Assisting someone to do it could be conspiracy. Conspiracy is a felony. Good luck if you attract the attention of a DA or the US Attorney.

It's not where I live. Besides, have you taken a look at (read) how many people on this site have done, and reccommend, this removal? You might as well be throwing that threat their way too.
As I have said before, it's not everyone's cup of tea. Everyone has their opinions. There is no law against suggestions. You should go back and read up on how many people have done this removal AND suggested AND shown pictures AND given detailed instructions on how to do this and tell them of your concern.
I gave him and option. He can do with it as he pleases.
Or...as someone else suggested....take it back to the dealer and have them fix their mistake.

personally i wouldn't go to that extreme. mainly i just want the check engine light to stay off. I did take the egr pipe out of the plenum and noticed that the gasket was pretty much disintegrated. so i will try to put a new gasket on it and see what happens.

Yellowtruck - Jails are full of smart guys like you.

EGR discussion aside, here's a couple of pictures of my vacuum lines:

http://lh5.google.com/runeiversen/R-...0/IMG_2993.JPG

http://lh6.google.com/runeiversen/R-...0/IMG_2994.JPG

http://lh3.google.com/runeiversen/R-...0/IMG_2996.JPG

Hope it helps.

runethechamp, thanks for the pictures.
[IMG]http://i231.photobucket.com/albums/e...nnervacuum.jpg[/IMG]

From the crude sketches in the FSM it seems like the vacuum lines controlling the egr are the ones you see in my last picture. If you look closely in my pics you can see the vacuum lines are numbered, maybe that can help make sense of the diagram under your hood?

http://personal.utulsa.edu/~nathan-b...77exhaustg.pdf

Here is the requested diagram.

Wow! You just can't let it go. You might wanna go back and read the forum rules, #2 in particular.
I love knowing that I'm far above your immaturity level. If you feel the urge to try and pick a fight or bash on other's comments or post's, you might wanna stop and consider your actions (comments) and the level of maturity your showing to other's.
You obviously have your opinions. I have mine.
Keep the bashing to yourself.

:nopity:

Unhook the EGR - you will get better mpg, a smoother running engine and you won't be feeding dirty exhaust back into your intake.

Im glad I did it to mine!

Trying to keep you out of trouble. Sorry.

Good man! :D It works like a charm.
Yes...it may not be the "best" thing for the environment but, do we all really want to get into what is and what isn't best for the environment? That list can get very very long. Being ex-military, I could write up a whole book about our government is one of the biggest pollutors.

In that case Georgiadave, I appreciate your concern.
We can now move on like adults.
:grouphug: