94toy4x4fever

ok egr on 22re. How does the exhaust get from thoes two little tubes on the manifold to the egr valve it self? I fallowed the pipe around the back of the head but cant quiet figure it out. Pics would be sweet!

thook

The exhaust comes up from the lower side on the block/crankcase and up into the downtube of the EGR valve.

What two little tubes are you talking about? The rubber vacuum hoses? Exhaust doesn't come through those. They operate the valve via vacuum routing.

Here's a diagram of how it works for Fed. and Can. emissions.

http://personal.utulsa.edu/~nathan-b...18egrsyste.pdf

Yours would be Fed. unless you have a California vehicle.

94toy4x4fever

no the metal tubes coming off my header! Then it wraps around the back of the head

thook

Oh...that e'splains it. Sorry..... the later developments of emissions equipment tend to escape me sometimes.

Well, hopefully someone else will chime. I'm not terribly familiar with post '92 vehicles.

94toy4x4fever

anyone else?

AH64ID

It gets dumped into the aft end of the intake manifold.

94toy4x4fever

yep thats what I thought! Thank man!!! Oh and what is the AFT?

myyota

AFT = Rear. Those tubes on your exhaust manifold are air injection tubes.

Not all 22RE`s have those air injection tubes., my 86 4Runner doesn`t have them.

94toy4x4fever

ok so these air injection tubes has nothing to do with the EGR right. How does the air injection work? Should my air injection tubes have carbon build up on them?

94toy4x4fever

or should i say in them!

AH64ID

Well they are a form of EGR, the exhaust flows thru them to the intake, so yes there will be carbon inside them... Other than that I never did too much tinkering with mine, it worked and wasn't an issue.

94toy4x4fever

ok now Im confused! One guy is telling me that air goes threw the pair valve then threw the tubes on the back of the head now dumping into the air injection tubes! And another guy is telling be something different. How does this flow?

94toy4x4fever

yes no mabye so?