1982 Datsun 720

[Jainer]

Hi...

Good Day

 

Can someone help me with my 1982 Datsun 720... When I turn it off and remove the key, the engine still running in a way as drowning and not turn off... Any advice or idea that can be...

 

Than You For You Help... :thumbup:

[The Taterhead]

Guys are going to ask you for more info (what engine, carb/throttle body, how & when it happens, etc.) but what you're talking about sounds like what is referred to as "dieseling".

 

The only thing I had to do to stop it was use a higher octane gasoline. I've only had the problem once.

[hobospyder]

Video?

 

Auto or stick?

[Jainer]

Stick... 1982 Datsun 720 2WD 22L gasoline.

[datzenmike]

Sounds like 'run on' or 'dieseling' where the heat of compression fires the cylinder without any spark. It shouldn't happen as you have an idle cut solenoid that shuts off idle fuel when the key is turned off. There are other way for the engine to get fuel though.

 

 

Idle set too high. Too high an idle will sometimes get around the idle cut. Try turning the idle speed down to 700-800 RPM. If it won't go this low maybe there is a blockage of the slow speed circuit and the idle was turned up to compensate.

 

Fast idle cam is stuck even if the choke is fully off. Carb spray to loosen the linkage.

 

Choke not fully off. When engine is warmed up take the top off the air filter and look. The choke plate should be fully vertical and open. Failure of the choke to warm up and turn off can be an alternator charge issue. Is there a buzzing sound from the glove box area?

 

Secondary not returned to full closed. If the secondary is stuck or something jammed between the plate and the barrel the idle will be high.

 

Carb flooding. Float chamber over filling and spilling into carb. Look at sight glass onfront of carb. Fuel level should be in the middle. Needle valve may be stuck or dirty or the float not set properly.