Engine stumble to turn off??

[Boom death]

So my l20b started acting up a couple of days ago, after the engine is nice and warm and u turn the key to shut it off it will stumble to turn off like it doesn't want to be turned off (I don't blame her I want to be in her all day lol) but it's kinda annoying I gotta sit in the car for like a minute waiting for it to shut off... Also I don't know if this has something to do with it but like a week before that it started backfiring In between gears shift only when I rev it to like 5000 rpm ..

Things I've tried

Cleaning carburetor with carb cleaner

New plugs wires and spark plugs and rotor on match box dizzy

[Dat Lurka]

Hitachi?

Check the wire to the Anti-Dieseling solenoid. It's teh screw in solenoid on the back of the carb near the linkages. The wire on mine was broken near the solenoid and it did the same thing. Pretty sure it's that cause if it was electrical then it would never shut off.

[banzai510(hainz)]

If a weber DGV was installed most dont have the anti desieling seliniod

Try running super gas

[Dat Lurka]

[Laecaon]

Retard the timing a degree or two.

 

Turn the idle mixture screw out 1/4 turn.

 

Basically you are preigniting. Most likely from a lean condition and hot motor. Retarding the timing a degree, will make it marginally cooler in the cylinder. Turning the idle mixture a 1/4 turn will make it a tad richer at idle. This will also make it less lean upon turning off the car.

 

Or simply dump it in a gear.

[Dat Lurka]

 

 

Or simply dump it in a gear.

 

the ultra simple fix I never would have thought of :thumbup:

[datzenmike]

Just get in the habit of placing in 4th, brake on and lift the clutch just enough to load the motor. Turn off key and it will stall easily. If an automatic shut off in drive and then place in park.

 

It's not hard to do and a half dozen times and it will become second nature to do.

[pants]

Oh hey mine does this too, I just pump the gas till it floods. Guess I should probably check that wire sometime.

[converted_to_datsun]

Mine does this too I just turn off the key and let the clutch out slowly. I had the same problem with the backfire too. Mine was caused by a weak coil, I replaced it with a super stock coil and no more issues but still have to dump the clutch

[dirtyydatsun]

its the timing, my l20 did the same thing. REALLY loud back fires, right? its the timing.

[Boom death]

i dont mind the back fire so much i actually think it sounds cool lol..

but it not wanting to turn off is not cool i looked at my Anti-Dieseling solenoid and all the wires look good so its back to square one

[banzai510(hainz)]

this is common on open chamber heads with weber DGVs

 

try shutting the motor down and slightly press the gas so the butterflies opens up at the same time. it will decrease the vacuum sucking in the idle jet.