Hi all

Thinking about pulling this bit of my car to save a few vaccy lines and so I dont have to work out where to plug in the green wire (in pic). Sounds like all it does is open the throttle a bit a decel...I'm not confident if the engine will have trouble at zero throtle position without it. Anyone else removed this part and lived to tell the tale.

I've attached the text from the manual to give you an idea what part I mean.

-----A14 Manual text----

THROTTLE OPENING SYSTEM
Description
The throttle opening system is utilised to reduce the percentage of hydrocarbon (HC) emissions from the engine exhaust during deceleration. It is known that when a coasting condition exists and the throttle valve is fully closed an inadequate quantity of fuel air mixture is drawn into the engine where
it incompletely burns. The throttle opening system is designed to open the carburettor throttle valve slightly whenever these coasting conditions exits. This allows an adequate quantity of fuel air mixture to be drawn into the engine where a more effecient combustion takes place.

Installed view of the solenoid and vacuum control valve
with the air cleaner removed.
The throttle opening system comprises of a speed switch and amplifier, a solenoid and a vacuum control valve and a servo diaphragm. On automatic transmission models the speed switch and amplifier are deleted and the neutral safety switch is utilised instead. The solenoid and vacuum control valve is located at the front of the inlet manifold. The servo diaphragm is located at the rear side of the carburettor. The speed switch and amplifier are part of the speedometer assembly. On automatic transmission models the neutral safety switch is fitted to the side of the transmission. The solenoid valve operates when the vehicle istravelling at below 10 km/h on manual transmission models, or when 'P' or 'N' is selected on automatic transmission models. When the solenoid valve is operative the servo diaphragm is inoperative. When the vehicle exceeds 10 km/h the solenoid valve is inoperative, this allows the diaphragm to operate provided the vacuum in the inlet manifold is high enough to overcome the resistance in the vacuum control valve. When deceleration takes place and the inlet manifold vacuum increases the vacuum control valve opens permitting inlet manifold vacuum to be routed to the servo diaphragm vacuum chamber. Applied vacuum actuates the servo diaphragm and the linkage to the carburettor, thus slightly opening the throttle valve to the desired degree. As inlet manifold vacuum lowers to a predetermined level due to the vehicle speed decreasing, the vacuum control valve begins to close. The vacuum control valve and the servo diaphragm are both adjustable, though it is recommended that testing and adjustment procedures should be entrusted to your local Datsun dealer.

-----end text-----

i have always unbolted this bit and chucked it in the bin... use less for me... i just take that little black hoe and routne it back onto the other nipple bit next to it.

Early 1200's didnt have them, so why should it make a difference in the big scheme of things.

Your running a manual trans so it doesnt do much, maybe autos are different beasts

Roger that - with that bit of positive reinforcement I'll ditch this piece of Datsun 80's technology from my carby.

Thanks Mik

EDIT: Thrown straight over left shoulder!

yea i did the exact same thing as unfamilia... worked a treat and didnt notice any differences or breakdowns etc.

Theres alot of useless emmissions and vaccum lines on our beloved dattos! Maybe not useless but not needed (only to pass rego/factory specs).

Dave

Quote:

Good info! I've got an A14 transplanted into a LBC (little British Car) and just got it started up last weekend, but not quite driving yet.

I will also toss mine over my shoulder and directly into the round file!

the purpose of the valve is to slow down the rate the throttle closes when you take your foot off the gas to reduce emissions no other purpose so if emissions are of no cocern take it off

Good to know bobs

Yeah my only initial conern was if I didn't have this device on the carb might lean out too much on decel - but I think my concerns have been put to bed and tucked in to boot.

All good info.

That hexagon looking thing behind the fuel line closest to the rocker cover is the fuel solinoid, they are evil when they play up. If you ever get cutting out problems they are usually the culprit.