Question about 1983 Pontiac Firebird

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I have a 1978 T/A with a 403. the car runs good ,but it won't idle after it warms up. It has good fuel pressure and spark. think its the choke. how can i unhook it to see if that is it?

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The choke will open automaticly when the engine is warm in ten mintes or so. Remove the air cleaner to check. If close still replace the chokes vacuum control diaphram mounted on the rear side of the carburetor

Posted on May 01, 2010

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Why wont my car idle after it warms up it runs good while going down the road but when you come to a stop it stalls out why is this


If your car uses an automatic choke. It could be that the choke is stuck in the closed position. There by flooding your car. Also check your fuel filter, electronic idling.

Jan 30, 2017 | 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

1 Answer

Car dies when it warms up. just replaced carb, think it has to do with this


Vapor lock again! Make sure the fuel lines are away from hot surfaces, or insulated.
Also, when it warms up, the automatic choke turns off, and the idle setting has to be set to run at that temp. There will be idle jets, maybe two, and idle stop setting for the linkage.

Nov 26, 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

I have a 2001 ford escape, when it is cold it does not want to idle right it chugs and wants to back fire through throttle body. when it is warm it runs good.I have replaced coil pack and spark plugs.


I would think it might be the coolant temp sensor as this increases the fuel for cold start. like a choke. it may also change the timeing of the engine cause it is read by the computer

Oct 12, 2012 | 2001 Ford Escape

3 Answers

1989 Ford Ranger 2.3l. Won't start. Does not have injector pulse. Has spark on all 4 passenger side wires. Has at least some fuel pressure. Timing and belt good. This was a progressive problem in that...


The fuel pressure has to to 35 to 45 psi. And no low fuel pressure will not cause no injector pulse.The veicle sounds more like a idle air control problem why? because as you stated it runs rough when it does start.Get it to start sysle the key you will hear the fuel pump go on cycle it three times then start it up. when the vehicle warms up take the idle air valve out and clean it with carburator cleaner or even brake cleaner you may even want to do the throttle body itself this should help with the hard start up and rough running

Aug 15, 2011 | Ford Ranger Cars & Trucks

1 Answer

1998 GMC Savana 3500 5.7L. Truck starts ok when cold. After running, very difficult to start have to pump the pedal and hold to the floor. Fuel pressure jumps to 62psi when pump runs, drops to 58 and holds...


HOW MANY MILES ALOT IT REALLY SOUNDS LIKE YOUR O2 SENSOR OK LOCATED ON THE EXAUST PIPE CLOSE TO ENGINE UNDER THE HOOD THEY CONTROL YOUR FUEL MIXTUER FOR HOT AND COLD LIKE A CHOKE . IF ITS BAD THE ITS FLOODING IT OUT WHEN HOT AND YOU GET ROTTEN GAS MILAGE BECAUSE YOUR FUEL PRESSURES ARE FINE REGULATORS EITHER WORK OR THEY DON'T AND IT THEY DON'T YOUR TRUCK WON'T RUN O2 SENSORS GOING BAD DON'T ALWAYS GIVE A CODE OR A DASH LIGHT BECAUSE OF THE BAD GAS MILAGE AND BLACK SMOKE WHEN IT IS WARM ITS PRETTY OBVIOUS WHAT IT IS OK GOOD LUCK POHLCAT

May 03, 2011 | 1998 GMC Savana

3 Answers

1975 Datsun (ie. mechanical fuel pump). Carburettor, electrics (inc. battery all good) fuel strainer all good. On cold start engine needs to be cranked several times. Warm start is invariably immediate. ...


Carburated vehicles ether have an automatic choke, or the very old ones, a hand choke. Yours has an automatic choke. The starting problem likely is a problem with the choke. The problem is almost certainly not the fuel pump.To set the automatic choke, push the accelerator to the floor, and RELEASE. Then start the engine just like you would a fuel injected vehicle. If this doesn't solve the problem, then the automatic choke needs to be repaired.

Oct 31, 2010 | Datsun Pulsar Cars & Trucks

1 Answer

89 dodge shadow. hard start. normal idle cold, fast idle warm. sometimes it wont start until i hear fuel pump activate.


Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve

Dec 06, 2009 | 1989 Dodge Shadow

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