The part circled in red below seems to be sticking and holding my throttle at about 1250 rpms. If I pop the gas pedal it'll settle down to the 800-850 where it's supposed to be. Is this supposed to do this? It doesn't seem right that after the truck is all warmed up that it should be holding the throttle at 1250? The truck I'm working on is a 1995 3.0vze with a 5 speed. Thanks, Lance

 

dash pot. ithink it helps for a more eco friendly and efficient burnoff of fuel when you let off the throttle. it is controlled by vaccum.

http://personal.utulsa.edu/~nathan-b...93throttle.pdf

 

Thanks, that sounds like what I see it doing but there's no vacuum lines running to it and it's just mounted on a sheetmetal bracket.....

 

When you let off the throttle suddenly, the dashpot lets the throttle come back at an "optimum" rate. Without the dashpot, air would be cut off while fuel is still present causing backfiring.

So basically it unwinds the throttle-on position to avoid that.

If it sticks, this can prevent the TPS from sensing the physical idle position. Yours seems to return to the correct position. As to why it takes so long... not sure.

 

thats correct. search dashpot for some help. I believe theres a way to clean the gunk out of it

 

Ahhh I just looked at the link you posted. I see it's just works on a controlled diaphram type deal. I'll take it apart tonight and clean it and see if I can get it to stop sticking. Thanks for the link

 

clean it and then spray some silicon lube along the shaft and you're good to go.

Troy

 

Yes, this is the dashpot. I replaced mine and my rig seems to be much better on cold starts. Idles great.

 

Mine was sticking so i took it,, mine runs fine without it

 

This is to ease the throttle down during quick decel, Shouldnt have anything to do with backfiring unless you have timing issues.

The rubber boot on mine was hard as a rock, Broke it off and drilled out the valve.
Its nicer in stop and go traffic and on the trail as it decels faster so you dont need to jump to the break peddle as fast or as much.

 

Last time I was positive I was having dashpot problems it ended up being some crap built up around the butterfly in the throttle body.

A little pb blaster and a rag and my idle dropped like it was supposed to again.

I bet the dashpot is fine on yours too...

 

It is NOT connected to ANY vacuum lines. Mine just got stuck at full extension, causing my truck to idle very high. I lubed it and no different. I got mad and pulled the sucker off and chucked it. I haven't had any problems since. Some people told me that it's supposed to ease the throttle so it doesn't slam shut after you let off the throttle.