The telescopic piston in the brass damper unit on the front of the throttle body does not appear to move with the throttle linkage on my car; the linkage comes to a hard stop against a separate adjustment screw before making contact with the piston.

I am thinking about removing the damper altogether, but am concerned that I am overlooking its function. Maybe the damper is not supposed to operate when the car is cold (which is when I inspected it), but when it heats up the piston extends out further to dampen the last few degrees of throttle-linkage movement.

Does anybody know if this is the case? Has anybody removed this thing?

 

thet thing is the cold start warm up valve, and works like a thermostat. if its not touching the linkage when its cold, then its not working anyway. does your car idle higher when its cold?

Michael

 

yes

 

I thought that valve was on the back of the throttle body near the coolant line. The piston I am talking about is on the front of the throttle body. My car idles higher when it is cold.

 

that thing is to keep the revs in check when you come off the throttle. the little white piece is supposed to slide in and out like a little piston and the throttle plates close gently as the piston goes in instead of just having the revs drop and stall.

 

I thought that was to keep the throttle from slamming shut.

On my old TB, I had the same problem. I purchased a used (but newer than my old one) and this little white piston slows the TB about .5 second. I noticed no difference between warm and cold.
I may be wrong, but if I were you, I would think about getting a replacement before deleting it.

-Ben

 

Replace it, do not delete it. It is not related to the cold start system at all. it is to keep the throttle from slamming shut as mentioned. It is to come in contact with the linkage at about 2800 RPM and should slowly close the whole way once you let off the throttle.

 

Thanks guys. This morning I discovered that it is called a Dash Pot and, as everybody pointed out, it is designed to stop the throttle butterflies from slamming shut and stalling the car when letting off the gas. Here is a good thread on the topic:

https://www.rx7club.com/showthread.p...t&pagenumber=2

A couple people have eliminated it with no adverse effects. I am going to wait until I have a good baseline with my new turbo before deciding what to do with it.

 

fwiw

I've been adjusting mine for the last few weeks in an attempt to eliminate some backfiring upon deacceleration. I have even removed it, still a little backfirng.

I also replaced the original dash pot with a 2nd gen one.