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Setting auto choke on 4G15 constant depresion carburetor

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Very high idle after rebuilt carburetor on Chevy 250 l6. Choke is okay, no fuel leaks. Engine races at about 3000 rpm


Sounds to me like the throttle plate is too far open at idle. Look for something hanging up and holding the throttle more open that it should be-like the choke like the auto choke or the fast idle cam screw set to far in. Look up the fast idle speed adjust procedure in the books and check out how yours is set up. Also, if the carb was all the way apart the throttle plate may be off center on the throttle plate shaft causing extra air to bypass the throttle plate. Good luck.

Jan 03, 2015 | Cars & Trucks

1 Answer

Carburetor problem?


check the setting for the auto choke and adjust the linkage with it.. Adjusting screw on the throttle butterfly that runs on the fast idle cam of the auto choke.

Feb 18, 2014 | 1985 Nissan Pickup

1 Answer

4g15 engine carburetor smoking only when engine is cold


smoking from where?, front of car, middle or tail pipe.


is this your first car, or first car and first winter (white steam?)
there are 3 kinds of smoke
black , carb flooding (ask why)
white, oil, burning, take for ever to go away
white steam, goes away fast and smells like Antifreeze, sweet and nasty.

and all carbs smoke black in the tail pipe end, when cold, unless
you very carefully tune the choke plate.
so do tell? what?

Jan 04, 2014 | 1995 Toyota Hi-Ace

1 Answer

Ford Ranger Carburetor Problem


Usually there is an electric heater on the side of the carb that opens the choke. You may want to check the heater to see if it has voltage and if it is working.
The linkage for the choke can get sticky or dirty and not work. Basic gravity and a spring opens the choke so the linkage must move freely.

Jan 04, 2013 | 1984 Ford Ranger

1 Answer

I have a 1996 lance with a 4G15 engine that carries an Asian carburetor,i have tryed everything to stop it from running on after i turn of the ignition which it does sometimes ,i have even change the...


1) Warm up engine first(run 5-10 mins)

2)Shut off engine

3) Back out on the idle speed screw until it justt doesn\'t touch the throttle linkage. Then screw it in back about 11 turns

4) Screw in the A/F mixture screw until it stops(do not force tighten)

5) Screw out the A/F mixture screw 2 full turns

6) Start the car. It will run like its choking. As long as it\'s running it\'s ok.

7) Now turn in the A/F screw until engine dies. If this happens, turn
out the A.F screw half turn at a time to bring it back. (try to start
the car of coz)

8)Continue to turn out the A/F screw at half turns every 3 seconds.
Engine will pick up speed. Continue to screw out until the point engine
runs worse. When that happens screw back in half turn every 3 secs to
the point engine runs smoothest.(do this by ear or watch engine
vibration)

9) Now set the idle speed. Go on the air conditioner. Watch the
tachometer. Turn in the idle speed screw until rpm is around 900 to 1000
rpm.

10) Now it\'s ready to rumble..

Jan 08, 2011 | 1992 Mitsubishi Mirage

4 Answers

Carburetor Tuning Mitsubish.


As far as i know, original stock carburetor for Lancer 1989-1992 engine 4G15 12 valve is Aisan Variable Venturi. It have 3 screws :
- air-fuel mixture screw
- main jet adjusting screw
- idle adjusting screw

and here's the document you may need :
http://www.mitsubishi-motors.kiev.ua/info.php?id=20
http://www.lilevo.com/mirage/

Good luck !
Winz

Mar 23, 2009 | 1992 Mitsubishi Mirage

1 Answer

New carburetor installed on 79 el camino


I am familiar with these, a manual choke carb works off of a bimetal coil in the manifold exhaust crossover on the passenger side of the intake, Make sure it is hooked up, then while the car is cold, on the rockchester carbs, use an 1/8 in drillbit to set choke. You have to loosen the three screws on the choke to set, when the choke flap, the very top one on the carb touches the drillbit, set it there and lock down screws, pump once or twice and it should start and idle, as the bimetal coil heats up it should open the top flap. if you try to accelerate before it is wam it will disconnect from the auto choke. I hope this helps if not please do not rate me at all, if it does help you fix your problem then please give me a fixya,

Dec 22, 2008 | 1987 Chevrolet El Camino

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