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Cold startup problems, short trips car wont restart. choke not opening properly?

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Recommend you clean throttle body and idle air control passages. Remove the idle air control motor (not to be confused with the throttle position sensor, which is right at the throttle shaft) to clean out passages.
Also check to make sure the EGR valve is not stuck open. The picture below is generic--your throttle body may be a single barrel turned horizontal. Please let me know if you have more questions.

cold startup problems, short trips car wont - jturcotte_71.gif

Posted on Nov 06, 2010


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1996 4.3 wont start untin you prime with gas then it runs great

4.3 what make? Priming with gas does what the choke should be doing, so my guess is that the choking system does not work.
Does your car have a carburettor or does it have fuel injection? There are 2 kinds of injection - via injectors or via manifold. These usually don't give hassles unless there is a problem with the temperature sensor.
If your car has a carburettor, it could be the automatic choke is not working properly. This is the little round gizmo attached to the side of the carb secured with a ring and three screws.
Take off the air cleaner, look into the venturi and take note of the position of the choke butterfly valve - that's the one mounted on a shaft that goes into the middle of the auto choke unit.
With the three screws loosened, not removed, slowly turn the outer cap and see what the butterfly does. Do this while the engine is cold. The butterfly should be just closed, maybe slightly on the open side. Now tighten the three screws on the pinch ring and that should fix your problem.
The auto choke has a bimetal spring inside that round plasticky thing that operates the choke butterfly. As hot gases from the exhaust heats up the spring, it opens the choke. Check that this spring, situated inside the round gizmo, is not broken.
Hope this helps.

Sep 27, 2014 | Cars & Trucks

1 Answer

F150 stalls

I'm assuming the truck runs ok once it is warmed up. Sounds like you need to make some adjustments. The cold idle speed is set too high, and the choke is opening too fast. The cold idle should be around 1500 rpm and the choke should take at least 90 seconds to open depending on air temp.

Jun 08, 2013 | Cars & Trucks

1 Answer

81 Firebird won't start. Getting spark to plugs. Just will not start New Engine put in.

i use over haul carburetors.if idle speed screw too low engine wont start.if engine cold automatic choke need to be closed slowly open as engine warm up.if engine cold automatic choke need adjusting or fixed or if choke remain closed when engine hot vechicle will not start most time automatic thermostatic spring goes bad causing choke problems.

Jan 25, 2013 | Cars & Trucks

1 Answer


Call up your local truck parts dealer and get the part! I believe that you have the solution to the starting problem if you replace the auto choke control.

Dec 31, 2012 | 1993 GMC Sierra

1 Answer

Have 76' dodge 440bb that is EXTREMELY hard to start. Can prime it cold and sometimes it will fire right up, other times it takes a few minutes. Drives fine once I get it going but if I turn it off and...

First 2 things to check are the choke adjustment and operation, and the raw fuel squirt from accelerator pump when throttle pumped. You should be able to see a good squirt of gas into throat of carburetor when you move throttle linkage to wide open quickly. Choke plate ( butterfly) should be in closed position for cold start, then open gradually as engine warms up. Have you checked that as of yet? With re-start problems after warm up, may be needle and seat assembly needs replacing to retain proper fuel level in bowl for starting. If they are dirty or worn, fuel in bowl runs back out. It sounds like a carb rebuild kit might be a good idea.

Mar 12, 2011 | Dodge Pickup Cars & Trucks

1 Answer

Half the hoses are missing lot of open vacuum leaks choke wont operate truck missing wont crank cold

There should be a vacuum hose diagram on the underside of the hood. Try plugging any leaking hoses to get it to run decent first, could have a fouled spark plug for the missing problem or a bad spark plug wire. As for why it won't crank cold, is the battery any good? Has to be charged up good to crank the engine over and fire the spark plugs. As for the choke not working, is it electric? If so, check for power at the choke thermostatic housing, the round black thing, should have a wire going to it that needs power to warm up the choke thermostatic spring.

Feb 27, 2011 | Ford F-150 Cars & Trucks

1 Answer

On short trips wont start after cut off now going down highway just cutoff and wont restart....?????

Your main power relay is the likely culprit that's bad. Have it checked and replaced if necessary. The no start after short trips was a clear sign of your main relay going bad.

Dec 13, 2010 | 1992 Honda Accord

2 Answers

I just rebuilt my F-150 1 barrel Carter carb (1985)once started runs great under all power ranges.Problem? Hard to start.

should adjust the butterfly to about 3/8" opening at 50 degrees farenheit when engine is cold. Usually about 1 mark to the lean side on the choke spring housing. If unsure set the choke to the center mark than richen up one mark at a time until the engine starts and idles up when cold after properly setting choke by fully depressing and releasing the accelerator before cranking. If it doesn't idle up enough turn up the fast idle screw 1/2 turn at a time. Another common problem with the YFA is the choke heat riser tube rusting off at the manifold and the choke not unloading when the engine warms. Install a new riser tube after using a drill bit the same diameter as the tube to drill out the remainder of the old tube in manifold before inserting the new tube and attaching to choke housing.

Aug 04, 2010 | 1985 Ford F150

2 Answers

Sometimes to start you have to give it a lot of

This sounds like a cold start system fault, which is a number of things.
  1. Cold start temperature sensor not operating correctly so the cold start system won't work when the engine is cold.
  2. The idle needs to be set to the correct RPM of the engine when warm, if it is idling ok when it is warm then this wont be the problem.
  3. Spark Plugs are worn and need replacing.
Most case's its the cold start system not operating correctly and if you have a good workshop to take it too they should pick this up quite quickly. Hope this helps, let me know how you get on.

Apr 03, 2010 | 1996 Toyota Corolla

2 Answers

1990 chevrolet 1500 pickup starts hard when cold

Most likely the coolant temperature sensor for the vehicle computer. Secondly, could be the tps sensor "throttle position sensor" not registering correctly or perhaps lots of other things but most likely the coolant temp sensor.

Oct 21, 2008 | 1990 Chevrolet K1500

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