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My 22R barely idles when cold and runs very rich, once warm it runs fine. Any suggestions?

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Thermostatic idle up valve on intake plugged or faulty-works of 12vsupply from a coolant sensor near tstat but normally bi metal strip insde wears out

Posted on Oct 04, 2009

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Sounds like you have a bad temp sensor for the computer. it may think it is always warm and not compensating for being cold so once it warms up it runs good!

the sensor is the two wire sensor right at the goose neck for the thermostat!

good luck

Posted on Oct 04, 2009

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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

1 Answer

Chevrolet Caviler 2.4 - 2000 Stalls at idle (stopped) once car is fully heated up.


Check coolant temp sensor. These fail often and cause all kinds of mystery problems. This unit acts much like a choke on old carb engines and can fail in different ways. Most common (I think) they fail such that the ECU thinks the engine is cold when it has begun to warm and thus the ECU delivers too long a pulse to the injectors so that the engine runs way too rich. I think it is also possible for the sensor to fail at any point between cold and warm such that the fuel mix is wrong except for the particular temp at which the sensor is stuck. Also O2 sensor has some fuel "trim" input.

Feb 26, 2015 | 2000 Chevrolet Cavalier

1 Answer

Hi my pulsar idles/drives allryt till it gets warm then when its warmed up it want idle at all and when you cruse it missis and compresor surges but put your foot up it and it goes fine


Please check your fueling system. While clod car need rich AFR, in contrary while engine hot , your car need lean AFR. This why your car is running bad while engine cold.

Regards, Vote please, JAY

Jan 23, 2011 | Nissan Pulsar Cars & Trucks

1 Answer

Engine rough idle cold. passes smog once temp reaches thermostat


you can take apart the top section and blow out the small passage that's bellow the throttle plate.

May 01, 2009 | 1987 Toyota Tercel Liftback

3 Answers

Temp guage barely moves and runs rough just off idle


Try a full tune up.. get Bosch platnium+4 spark plugs and Acel wires, do the fuel filter and air filter(i suggest K&N) buy some fuel injector cleaner or use Marvel Mystery oil. The ECU could e gone but hard to diagnose if the car needs a tune up.

Jan 18, 2009 | 1992 GMC Sonoma

1 Answer

Rough idle until warm 22r


if it is a carburated engine it is probably the a.a.p. diaphragm in the carb. if you remove the air cleaner and look on the side of the carb that is towards the valve cover near the front yow will see a vacuum hose going to a cover that is fastened with 3 screws. if you pull the vacuum line off you will see that there is probably fuel being sucked into the line due to the leaking diaphragm. the vacuum source is temp controlled and cuts off when warm. but when cold sucks fuel directly into the intake. remove the 3 screws to replace the diaphragm, being carefull of the spring. good luck!

Dec 13, 2008 | 1987 Toyota Pickup

1 Answer

My truck doesnt want to idle when its cold


If it is carbarated, adjust the choke to run more richly.

Dec 01, 2008 | 1986 Ford F150 SuperCab

1 Answer

I have a '69 E Type with stromberg 175 cd-2's that are causing problems when the engine warms to operating temperature. It runs fine when it is cold and then when it warms up it quits. When I try to...


Your problem is more likely a distributor-timing problem, than a carburator problem. The richness of the fuel acts like a constant choke, and the car runs fine until it warms up.

Once the car is warm, try manually advancing the spark. If that helps, then take the distributor to a repair shop that can tell you if the vacuum advance is working properly.

Remember, the spark must be +10 degrees advanced when cold.

Good Luck

Jul 25, 2008 | 2006 Jaguar XK-Series

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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