mkultra

I was looking at the vacuum lines as I was replacing them and noticed that my dashpot goes right to the throttle body. All of the pics and diagrams I could find online show a short hose that just has a check valve on the end so this didn't look quite right. Anyone know if it is right or if I'm missing stuff or have wrong connections? Thanks!

mkultra

OK think i figured it out, it's a throttle advance not a dashpot. It was adjusted so it didn't touch the throttle when i bought the truck, probably why it runs crappy until it warms up and they had the screw on top adjusted way out to try to compensate. It still idled low on start and idled high when warmed up. I have it adjusted to about 1250 rpm with the throttle advance out and 875 or so when it is sucked down. I'm waiting for the truck to cool down to see if it works like I think it should while warming up.

scope103

I don't know much about the 22re, but that looks like a "throttle opener." http://personal.utulsa.edu/~nathan-b...34throttle.pdf With the engine running, the vacuum pulls the plunger out of the way, and it does nothing. When the engine is shut off and the vacuum drops, the plunger immediately comes out and opens the throttle "a little" to stop dieseling.

It has nothing to do with temperature, warming up, cooling down.

rustypigeon

That is the Dashpot. Its purpose is to reduce emissions during deceleration by keeping the throttle slightly open.

scope103

[This is a 3vze, but the dashpot and throttle opener are same components. They are just oriented differently on a 22re.]

Note that the throttle opener has a vacuum line; the dashpot does not.

Which one looks like the one mkultra is asking about?

Odin

The dashpot in the pic scope posted looks like the one on my 91 22re. Mine does have a rubber bellows cover on it's shaft though.

rustypigeon

Yeah that does look like a throttle opener, I stand corrected. The Auto trans should come with a throttle opener, the manual trans should have a dashpot.

scope103

Mine should too; if I knew an easy way to replace it I would.

Does the 22re only come with one of the two?

rustypigeon

Yes, only one.

scope103

Thanks; the EPC shows a drawing of what is obviously a throttle opener, but the callout to that location says "dashpot." Now I understand.