Throttle Valve Dashpot Question
Dr. Ian McArthur
sutul at telusplanet.net
Mon Jul 28 22:27:21 EDT 2003
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My Canadian 5TQs both have a "throttle valve dashpot" as shown on page 25.29
of the Bentley manual. I do not know if US cars have these.
Does anyone know what they are supposed to do? I assume they are like the
dashpots on carbureted Fords and control the speed at which the throttle
closes when you take your foot of the accelerator.
However, the dashpots on both of my cars don't dash or pot. They have no
resistance at all except the slight spring pressure which certainly cannot
control the throttle closing speed..
I have been having problems with one car stalling on idle (only when the car
is really warmed up). The revs drop quickly to ~ 300, then recover in a
second or so to the correct 800. Sometimes. At other times the idle speed
does not recover and the car gradually stalls (in about 2-3 seconds). I
have swapped most of the suspect parts between the two cars. The other one
still runs fine with the switched parts, the first still stalls. I have
checked fuel pressures, idle amperage, vacuum leaks, decel valve, idle stab,
oxy sensor, etc. etc. as suggested by many list posters in response to my
post of a few days ago (Thanks very much, by the way... it sure helps!!).
It occurs to me that if these dashpots are supposed to control the rate of
throttle closure on idle, that might be what's causing my problem.
Any assistance would be appreciated.
Thanks
Ian
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Dr. Ian McArthur, Consulting by Acronym, Cochrane, Alberta
sutul at telusplanet.net
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