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 Importance of Dashpot Assembly -- 22RE
#810408
05/08/07 03:31 PM
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Joined: Aug 2004
Posts: 33
OP
Getting the Wheeling Fever
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Hi all,
I was trying to check my TPS this past weekend as I'm having horribly erratic acceleration and power and certain RPM's/gears (auto tranny).
Following Roger's instructions (awesome write-up's btw), I noticed there is supposed to be a dashpot assembly. Upon easy inspection, my engine lacks this assembly completely. There is just a gaping hole there.
My question is this:
If this is supposed to prevent backfiring, and my truck has never backfired, what is the real purpose of this?
Will I notice an improvement anywhere in engine performance if I buy the parts and add this back in?
If anyone has the part numbers or two sense about this issue, please let me know.
Regards,
Justin
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Re: Importance of Dashpot Assembly -- 22RE
[Re: pinemind]
#810409
05/08/07 03:37 PM
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Joined: Mar 2004
Posts: 514
Rock Warrior
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Mine was sticking and I removed it in 2001. Haven't missed it.
Fur clog in the sausage grinder
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Re: Importance of Dashpot Assembly -- 22RE
[Re: pinemind]
#810410
05/08/07 04:57 PM
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Joined: Nov 1999
Posts: 1,049
Body Damage is Cool
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Hi all,
I was trying to check my TPS this past weekend as I'm having horribly erratic acceleration and power and certain RPM's/gears (auto tranny).
Following Roger's instructions (awesome write-up's btw), I noticed there is supposed to be a dashpot assembly. Upon easy inspection, my engine lacks this assembly completely. There is just a gaping hole there.
My question is this:
If this is supposed to prevent backfiring, and my truck has never backfired, what is the real purpose of this?
Will I notice an improvement anywhere in engine performance if I buy the parts and add this back in?
If anyone has the part numbers or two sense about this issue, please let me know.
Regards,
Justin According to the FSM, Manual trans were fitted with the dashpot. Not on the automatics. I would look at the TPS and or ignition system for your troubles
1985 SR5 4Runner
eLocked with Carter Lock
4.7:1 single case
Davez Offroad twin stick
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Re: Importance of Dashpot Assembly -- 22RE
[Re: pinemind]
#810411
05/09/07 01:06 AM
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Joined: Jan 2000
Posts: 12,153
Web Wheeler
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I think it is more of an emissions device, probably prevents a little HC going out the pipe every time you shift gears. I've not had any smog check folks look at mine, so if your engine otherwise works fine, leave it off. I find mine helps a bit with it's internal spring to help push the throttle open which is tricky with the early 22RE throttle linkage: - http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml#Dashpot
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Re: Importance of Dashpot Assembly -- 22RE
[Re: 4Crawler]
#810412
05/09/07 01:27 AM
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Joined: Apr 2004
Posts: 2,010
Body Damage is Cool
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to my knowledge, the dashpot prevents the throttle from slamming shut when shifting gears.
87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.
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Re: Importance of Dashpot Assembly -- 22RE
[Re: 87Toy4x4]
#810413
05/09/07 02:51 AM
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Joined: Jan 2007
Posts: 241
Wheeler
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Only the manual trans 22re have the dash pot. And yes its there to prevent the the throttle slamming shut when shifting. There is a procedure for adjusting.
Keep the Shiney Side up. Support our troops.
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Re: Importance of Dashpot Assembly -- 22RE
[Re: canuck]
#810414
05/09/07 11:28 AM
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Joined: Apr 2007
Posts: 76
Getting the Wheeling Fever
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When you let go of the gas pedal the dashpot keeps the throttle open for a second or 2 to help burn off any excess fuel. Its an emissions device. My 89 5spd 22re had one but the adjusting screw had been removed. When i put an adjusting screw in and set it to spec (2000rpm for mine), i quickly realized why the previous owner had removed the screw, the dashpot was stuck and wouldnt allow the idle to come down back to normal. This caused high idling and when i would press the brakes the rpms would go up and down. So i bought a new one from the dealership (about $50) and installed it. I noticed an improvement in driveability when shifting gears. With the throttle staying open for a lil longer it helped make the gear shifts smoother. Just my experience.
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