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Old 01-23-2010, 09:07   #1 (permalink)
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Duratec misfire when cold

I have a 2000 taurus with the 24v Duratec which will not idle probably when the engine is cold - below freezing - it is not firing on all cylinders. when you drive along it works fine until you come to a stop and then it will usually shut off. so i changed all spark plugs and boots which didnt help. checked for vacuum leaks and havent found any. took it to Ford and they replaced 2 ignition coils because they said they were reading a misfire on cylinders 2 and 6. next morning when the engine was completely cold it was doing the exact same thing as before. will be getting my money back for the 2 new coils :{ the engine light is not on. wondering if i have a fuel injection problem or dirty fuel filter but doubt it because it runs fine when driving it.
any thoughts ?
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Old 01-23-2010, 10:23   #2 (permalink)
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Re: Duratec misfire when cold

Have you tried cleaning the MAF with the MAF cleaner. That often helps. I'd also talk to the dealer and tell them it ddn't help.
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Last edited by Bert; 01-23-2010 at 10:25. Reason: Added info.
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Old 01-23-2010, 10:28   #3 (permalink)
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Re: Duratec misfire when cold

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Have you tried cleaning the MAF with the MAF cleaner. That often helps. I'd also talk to the dealer and tell them it ddn't help.
Yes i talked to the dealer and told them that i want my money back for the ignition coils.
MAF cleaner ? is there something special for cleaning the MAF ? could i use carburetor or fuel injector cleaner and a brush ? also if this wasnt working properly wouldnt it cause the engine light to come on ?
thanks
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Old 01-23-2010, 12:48   #4 (permalink)
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Re: Duratec misfire when cold

Use the special MAF cleaner and don't brush it. It senses the air flowing through and if it's coated, it wouldn't know there could be a problem, so the light wouldn't come on. This may not be the problem but it could help. I've seen it before.
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Old 01-24-2010, 11:22   #5 (permalink)
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Re: Duratec misfire when cold

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Originally Posted by rtg143 View Post
Use the special MAF cleaner and don't brush it. It senses the air flowing through and if it's coated, it wouldn't know there could be a problem, so the light wouldn't come on. This may not be the problem but it could help. I've seen it before.
Cleaned the MAF sensor with no effect. would the camshaft position sensor cause misfire at idle ? also if that sensor is gone would the engine light come on ?
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Old 01-24-2010, 11:56   #6 (permalink)
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Re: Duratec misfire when cold

Take it to Autozone and have them check to see if there are any codes. The light doesn't have to be on for codes to show.
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Old 01-24-2010, 14:15   #7 (permalink)
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Re: Duratec misfire when cold

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Take it to Autozone and have them check to see if there are any codes. The light doesn't have to be on for codes to show.
Just had it to Ford and they said a previous code had a couple of lean banks. i just found that the rubber hose coming from the PCV valve to the intake collapses when you start the engine, which means the PCV valve is stuck closed. will change it tomorrow, i wouldnt of thought a closed PCV valve would cause misfire but hopefully its just that.
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Old 01-24-2010, 14:36   #8 (permalink)
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Re: Duratec misfire when cold

Hope that's it. Post back so we know the outcome.
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Old 01-26-2010, 20:39   #9 (permalink)
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Re: Duratec misfire when cold

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Hope that's it. Post back so we know the outcome.
Replaced the hose and the PCV valve with no effect. running out of ideas and money :(
i have heard about the rubber seals on the intake manifold hardening over time and leaking, since they are only $20 i guess i will replace them and hope for the best
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Old 01-26-2010, 20:53   #10 (permalink)
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Re: Duratec misfire when cold

The seals did have a problem and usually set a P0174 and P0171 code. Post back to let us know the outcome. Good luck.
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