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Re: engine lucrches in idle in cold weather. warm engine...
SOunds like you are not getting dle enrichment during cold engine operation. Go to AUtozone or other parts store and they can run free diagnostci test for you to see if you hvae a fault code sotred telling you what is the problem.
Possibly injectors need cleaning. Buy a bottle of Techron Injector cleaner & add to fuel tank.
ALso, you MAF mass air flow sensor could be coated. Clean gently with carb cleaner. It is in air cleaner system or tube and has a small wire harness going to it. Good luck.
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What year F150? Newer? Is it cold right now where you are? It is normal for most fuel injected, computer controlled engines to run at higher idle speeds in colder weather (kind of equivalent to a choke) It helps warm up the engine faster. As long as the idle speed gets close to normal when the engine is warm and no lights are on, I wouldn't worry about it!
1. Injector cleaner.2. Does it have enough miles (75K-plus) to consider changing plugs?3. What's the air cleaner look like?4. Any codes showing?Here I am trying to give answers when I probably know less than you....Good luck.
have a 97 crown vic,
in warm weather it idles fine and run fine
now that its cold I have to hold at high idle to have warm up
for about 10 mins.
if I just start it the engine will die with out me holding on foot on the gas
Mine did the same thing...at 42F degrees, run bad. After it warm up, it would be fine. This would only happen in the winter. It would throw a code saying it was lean in Bank 1 or 2. The issue is a contraction of the intake gasket due to the cold weather, when it contracts, it leaks air. There is a new, improved gasket now from GM, or get a Felpro from major auto stores and it will work fine. I consistently had the problem every winter, and this has fixed the problem for the last 3-4 years.
Could be a problem with your intake air temp sensor or your coolant temp sensor. The most likely would be the coolant temp sensor. It may be reading cold and will make it run good as the engine is cold but as it warms it is not adjusting the air fuel ration to the proper levels making it run rough hot
Count your blessings that it starts. It sounds like the cold air is affecting the idle mixture. Check the hose running from the manifold to the air box to see if it is intact. If not, replace/fix it so that you pull warm air in as soon as the engine heats up.
Pumping the pedal on an injected engine does nothing, except varying the air intake amount. I would change the fuel filter (if badly plugged, it may be causing the pump to shut off early) and clean the idle air control valve.(which should regulate idle air flow, eliminating the need for playing with the pedal) The valve itself is not difficult to service, but is a bit delicate. It can be cleaned with carb cleaner. just make sure you do not turn the valve end around while cleaning, and re-install it perfectly straight. You may have a bad drain back valve in the pump, but this is less common than what I outlined above.(there are tests for this)
Have a mechanic take a look at your throttle position sensor and engine idle sensor. Make him manually adjust them as opposed to just putting in new ones. It may require that you have to have a higher idle than normal. Your underlying cause is going to be that I am sure you have a lot of miles on your engine.