sincal

Ok i took off the hose that goes to the top of the egr valve and there is no suction. Is this normal or no. I thought there was suppose to be vacuum on that hose. Can someone clarify this for me.

22re

thook

It should open the pintle valve/diaphragm. If not, it's probably just stuck and needs cleaning. The vac port may be clogged, as well.

iamsuperbleeder

Did you just check it at idle or while reving the RPMs up a lil bit. I don't think it has a vaccum at idle... I believe it's suppose to kick in at some RPMs and open the EGR valve a little...

correct me if I'm wrong N E one...

sincal

i followed the hose i pulled, back to the metal hose that runs along valve cover then around to the thermastat housing .. i dont know what sensor that i pulled it from but is this the normal routing of this hose . i unpluged there as still no vac.

sincal

i checked at both idle and higher rpms

thook

Oh...I misunderstood.

The hose goes to the bimetal vacuum valve. The vacuum valve opens once the motor has warmed and there is certain amount of load on the engine.

Here's a tech article explaining how it works.
http://www.autoshop101.com/forms/h61.pdf

sincal

well sh+t after that article i think my hoses are all fubared. I done think they are in the right spots.. ill go check right now

thook

What year is your truck?

sincal

Its a 1990

thook

Hmmmm......might be different than what I'm familiar with. Maybe someone would be kind enough to post some pics.

I'll see if I can locate some. I think I know where some may be.

thook

I think there's some pics in this thread. It's a little long, but just scroll through for pics.

https://www.yotatech.com/forums/f116...lprits-142472/