Question about 1993 Nissan 240SX

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Once engine is warm and running the engine starts to choke (either fuel or air) unable to gain speed

Once engine is warm and running, the engine starts to choke and unable to gain speed

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INJETOR,S LEAKING OR FUEL PRESSURE REGULATOR.

Posted on Apr 17, 2009

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1 Answer

Engine starts but cannot speed up


sounds like you have a pressure switch sticking or has failed .

Aug 11, 2015 | Cars & Trucks

1 Answer

I tried the coil that didn't solve it


Look at this forum for tractors.
I hope it helps you!

http://www.tractorforum.com/f192/ih-674-78bhp-running-under-load-issues-17715/

Another thing that can cause this is the carb. It may be getting too much fuel once it's warmed up. An engine needs more fuel when it's cold than it does when it's warm. Cold engines run inefficiently so they need more raw fuel to fire-up, and stay running. This is all a choke does. A choke plate closes-off the air going into the carb which makes the fuel mixture really rich so it can run. Less air = more fuel. You'll also notice that cars with chokes also idle real high until they warm-up. This fast idle and the over rich mixture (due to lack of air), allows the engine to fire up and stay running. As the engine warms-up and starts burning fuel more efficiently, the choke plate begins to open, which slowly lets more air in and leans-out the air/fuel mixture. Once the engine is warmed-up, the choke plate will be wide open allowing the carb to run as it is supposed to with the correct metering of fuel and air.

Jun 11, 2015 | Cars & Trucks

2 Answers

Won't start when cold


hello wyatt...... Is your jag.built with a carburetor or fuel injected?
Carb, your choke is not set to close when cold, and should be set. When set, it also sets a cam that keeps the engine running fast. Then when warm, you hit the pedal and the cam moves, and the engine speed goes to normal. Unless the choke is set, the engine cannot keep running, as it tries to run on cold gas and it can't run good on cold gas. It needs more gas, therefore, and the choke makes more gas go into the engine.

Fuel Injected, the computer should adjust the amount of gas your car is getting when cold. If not, the coolant sensor might be bad.
The coolant sensor senses the cold engine and tells the computer to add more gas. Once the engine is warm, the coolant sensor tells the computer to put the gas to normal.
So, if the sensor is not working, the engine will try to run normal, and if cold, it can't. Joe Thanks for choosing Fixya!

Dec 24, 2010 | 1985 Jaguar XJ6

1 Answer

Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

421d8f7.jpg


The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

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Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

cadcd19.jpg

Jul 31, 2010 | 1981 Ford Bronco

1 Answer

Fiat x19 missfires once warm and above 60mph


carb. needs to be rebuilt. most of the time the choke is not letting in enough air

May 06, 2009 | Fiat X1/9 Cars & Trucks

1 Answer

MOTOR SHUTS OFFWHEN HOT1989 CAVALIER Z24


It sounds like your IAC,idle air control,this unit controls your idle once your choke completally shuts off.on 2.8litre it is located right side of engine just above where your fuel lines go into your manifold ( fuel rails), it's held in by 2 screws &looks like a little electric motor, it's actually a soliniod, inside is a little pinnacle that goes in and out and is controled by the computer.good luck.

Mar 01, 2009 | 1989 Chevrolet Cavalier

2 Answers

Engine surges when cold - Once it warms up it runs fine


If carburated, I would suspect a sticking choke, making the fuel mix way too rich.

Jul 02, 2008 | 1997 Jeep Cherokee Country

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