From time to time, my '87 4Runner with 22RE engine decides to adopt a high idle due to the dashpot. I've tried to clean it, but it cannot be opened without destruction. Without the dashpot, the idle drops to the correct level.

My question is, will I have any issues at SMOG time here California if I remove the dashpot? The friendly Toyota dealer really likes these things as they want $149 for a new one, so this toy's not getting a new one. Any other drop-in replacements anyone has found?

 

I don't think it hurts to be without. For visual, if you have a smart smog tech, they may catch it. Dunno though. Mine hasn't had one for two plus years now, just makes it idle down faster. I've got a reply to somebody's thread here somewhere, I'll find it..

 

All the dashpot should do is keep the throttle open for just a moment when you let off the pedal to shift gears or any time you suddenly release the pedal so as to prevent backfire (up the intake) or afterfire (out the tailpipe) due to the sudden, extreme rich fuel mixture that can occur during that.

I don't believe it will cause an issue with emissions testing, in particular the tail pipe tests, but not having it may fail a visual inspection. If you can't find a working one in a salvage yard, maybe you can simply plug the vacuum line with a bb or similar so the dashpot and line can appear to be installed, and adjust it so it no longer affects the throttle position: loosen the lock nut, turn the "shaft" in then tighten the lock nut.

FWIW, my 88 had a similar issue where occasionally it would co-opt a high idle, around 1000-1200, and tended to do so after longer trips: > 60 miles or so, and warmer weather. I found it was dirt and oxidation around the throttle return springs causing them to stick and not let the throttle fully close and quick tapping on the accelerator pedal usually got it to idle normally.

 

Ah the dash pot is like the sway bar in the front end, just there for looks. (kidding)

I took my dash pot off of mine and never had an issue with smog techs or the emissions test.

 

I bought the $149 new one from the dealer and still have the issue every now and then, I will be and would suggest looking into ABE's post above, I now have something to do after work...Thanks ABE sheeesh...

 

Wasn't me; didn't see me; can't prove anything.

 

https://www.yotatech.com/forums/f116...engine-220127/

Little different year and engine-wise, but here, said I'd find it.