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  #1  
Old 10-09-2013, 01:31 PM
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Default Cold Temp Misfire

My 02 2.3l is missing when the truck is cold. Once it warms up, it runs like a champ. Coil pack is new and so are the plugs. Wires are just a few years old. Anyone know what it could be? Thanks

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Forgot to add, it doesn't misfire constantly while it's cold. It'll run good for a few cycles, then miss for a few, run good, and just repeats until it's good and warmed up.
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  #2  
Old 10-09-2013, 02:16 PM
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Checking the fault codes would REALLY be helpful here. Otherwise all we can do is throw guesses at you.

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  #3  
Old 10-09-2013, 06:35 PM
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Default Re: Cold Temp Misfire

No codes as of now.
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  #4  
Old 10-10-2013, 12:14 PM
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Default Re: Cold Temp Misfire

air temp sensor in the bottom of your air box might be my best guess.
Or mass airflow sensor.

have you tried cleaning either then reseting the PCM?
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  #5  
Old 10-10-2013, 07:31 PM
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Mine does the same thing, changed the sensor and it still does it

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  #6  
Old 10-11-2013, 02:13 PM
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Default Re: Cold Temp Misfire

There isn't a sensor in bottom of air box, but I just cleaned the. MAF sensor and reset PCM, will let you know results soon.
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  #7  
Old 10-12-2013, 12:45 AM
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Default Re: Cold Temp Misfire

I think there really should be one at in the air filter box. It's either a air temp sensor or air pressure sensor.

So you're saying that thre is NO OTHER time that it misses?
Can you define "misses" so that we are talking the same language?
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  #8  
Old 10-12-2013, 05:09 AM
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Default Re: Cold Temp Misfire

Does it do it in open loop and then stop in closed loop?

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Quote:
Originally Posted by bigj0430 View Post
No codes as of now.
How many times have you checked for codes? Have you ever had a pending code?
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I bought the truck from the OO in 8/1/2013 for $900. It had a burnt exhaust valve. I just threw some heads on it(5/1/2014). Ford has many good engines, the 3.0 Vulcan is not one of them. I bought it for the price.
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  #9  
Old 10-12-2013, 01:46 PM
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Default Re: Cold Temp Misfire

Quote:
Originally Posted by matteusclement View Post

So you're saying that thre is NO OTHER time that it misses?
Can you define "misses" so that we are talking the same language?
It will idle rough then smooth out and then rough again. Also at take off will sometimes studder real bad and then pick up. And yes, only misses at cold temp.
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  #10  
Old 10-12-2013, 11:45 PM
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Default Re: Cold Temp Misfire

I just went through something very similiar to this after doing my wires...

in the end it turned out my haynes manual was wrong and I had wired it wrong resultig in misfires and poor performance.

check you firing order again.
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  #11  
Old 10-13-2013, 07:49 PM
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Default Re: Cold Temp Misfire

Last code was a misfire. Replaced coil pack, reset codes, and problem solved. So I thought. Now that the weather has turned a little colder, it has started missing while the truck is warming up. Once warm, it's fine. So I know it isn't the firing order because that would cause a constant issue. It has been a few weeks since I've checked codes though.
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  #12  
Old 10-13-2013, 11:32 PM
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Default Re: Cold Temp Misfire

It sounds to me like your air temp sensor then.
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  #13  
Old 10-14-2013, 06:54 AM
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Default Re: Cold Temp Misfire

02 2 3's dont have an intake air temp sensor.
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  #14  
Old 10-14-2013, 07:09 AM
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Default Re: Cold Temp Misfire

Quote:
Originally Posted by stateranger View Post
02 2 3's dont have an intake air temp sensor..
It might be part of the MAF? does the maf have 6 wires?
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 113k.(6/5,2014)
I bought the truck from the OO in 8/1/2013 for $900. It had a burnt exhaust valve. I just threw some heads on it(5/1/2014). Ford has many good engines, the 3.0 Vulcan is not one of them. I bought it for the price.

Last edited by modelageek; 10-14-2013 at 07:29 AM.
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  #15  
Old 10-14-2013, 09:22 AM
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Default Re: Cold Temp Misfire

i think that's right, it's all built into the maf.
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