210 auto stalls when deccelerating

[aatrain]

Just swapped into a great little 210 with automatic. Runs and drives really good, but it has an annoying habit when it warms up: it stalls when I am deccellerating to a stop, or coming to an intersection. It also is idling high in park and neutral. Currently, I'm having to shift into N when apprOaching an intersection so it doesn't stall, but it only does it after a 15 min warmup.

I haven't got the manual yet- have only had it a couPle of days, if y'all could shoot me some ideas, I'd appreciate it.

[hitch]

Worn throttle shaft allowing to much air when butterflies are closed. Or a vacuum leak. Use the old carb cleaner around the base and hoses trick as a start.

[datzenmike]

First thing I thought of was vacuum hose fell off.

[aatrain]

I thought vacuum as well, but everything looks to be in place, not much play or rot either. Will try the carb cleaner and check the throttle shaft s well. It's kind of sputtery at idle when it warms up as well...

Thanks

[Wide14u]

Worn throttle shaft allowing to much air when butterflies are closed. Or a vacuum leak. Use the old carb cleaner around the base and hoses trick as a start.

 

i do that all the time it work great

[ggzilla]

That's an air leak (vacuum leak).

 

The carb gasket on a 210 rarely leaks. But 80% have a leaking vacuum advance diaphragm, 60% have a leaking air cleaner heat-air diaphragm and a lot of them have a leaking choke pull-off. See http://datsun1200.com/modules/mediawiki/index.php?title=Vacuum_Leaks

[datzenmike]

Vacuum leaks aside, some other causes are:

 

The EGR valve accumulates deposits and does not shut properly. At idle there is no EGR so if the valve is leaking it will act like a vacuum leak. Sometimes just lifting the plinth with your fingernail and letting snap closed will clear it.

Valve clearance(s) are too tight.

Idle mixture needs adjusting

Timing too retarded.

[aatrain]

Thanks, y'all. I'll update cause when solved. Thanks for the link too.

[hogboy52]

As part of the throttle assembly there is a canister device with a plunger that will hold the throttle partly open for a short time. It's there because the auto trans still has some load on the engine and will stall it out otherwise. There is some adjustment to it or it may have quit working. It's not needed with the standard trans and I cut off the one on my carb.

[datzenmike]

Yes, it's a dash pot. It stops the throttle from closing suddenly.

[ggzilla]

There are two canister devices

 

* Dashpot is automatics usually, but on later models is used on some manual models.

* Throttle Opener, used by both auto and manual, depending on year, etc.

 

Dashpot (no vacuum is involved, but if it gets loose, the idle varies all over the place):

 

Throttle Opener (operated by vacuum):

[aatrain]

Thanks so much for all the visuals. All of your help is awsome. I retrieved my vacuum pump today and am planning a long weekend for figuring this (and a couple other ) problems out. BTW- I will soon be doing a transmission swap to 5 speed, so I'm going to be selling/ trading the automatic trans- look for it in the appropriate section soon.