Question about 2001 Ford Mustang

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2001 Ford mustang V6 cold start issue. Every year, when the weather starts getting colder, I have this same issue. The car cranks right over but then the idle drops off and the car starts running very rough until it just shuts off (or I turn it off). It generally only does this once or twice and then will start and run normally. I have cleaned and then replaced the IAC, replaced the battery, changed the plugs and wires and coil and even the MAF. I'm not sure what else to look at. Any help would be appreciated.

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6ya staff

  • 2 Answers


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Posted on Jan 02, 2017



  • 10 Answers

SOURCE: runs rough

How long have you had this problem? It could just be a bad tank of gas. Other things to check:
1. fuel pump and filter
Could be running on only 5 cylinders due to
2. spark plugs/wires
3. plugged fuel injector
Any problems with electrical? Like lights dimming at same time as running rough?
4. could be bad alternator putting excessive load on engine.

Posted on Dec 17, 2008



  • 12 Answers

SOURCE: Car starts hard and runs rough in cold weather, undrivable

a few thigs to look at coolant temp sensor and the idle control motor under the throtle body... the IAC motor when bad you will have to keep giving car gas till it gets wormed up very comm. prob whith your car i have changed at least 15 of them on cust. cars hope this helps

Posted on Dec 30, 2008

Denny Voyles

  • 59 Answers

SOURCE: 97 Ford Ranger 4.0L V6 Idles rough only when cold


Ther is a air Idle control valve located on the side of the throttle body. unplug it remove it spray it and clean it with carb cleaner replace it plug it back in and you will be a Happy person again.


Posted on Feb 01, 2009


  • 1 Answer

SOURCE: 2001 v6 escape rough idle when cold

To update my earlier repair on the 2001 6 cyl Escape: When cold, and when the ignition was turned over but no accelerator pressure given, the rough idle finally returned the P0303 code again when the check engine light came on indicating that it wasn't caused by the plugs or the coil. FYI, I had replaced the intake manifold gaskets during the original repair and just prior to that I had replaced the fuel filter which was very dirty (I cut it open to see).

The repair manual referred to fuel injectors as a possible problem. I have run three tanks of fuel using different injector cleaning products and am very pleased with the results. Cold starts are much smoother and I am unable to coax out the P0303 code or any other code.

My opinion, change the fuel filter, use a fuel injector cleaner for a couple of tanks, change the plugs if the problem still exists. The coils were not the problem on my vehicle.

Posted on Mar 09, 2009


  • 2 Answers

SOURCE: 1996 Ford Windstar engine runs rough

DIS ignition, no distributor to " get in there " with....

Posted on Jul 10, 2009

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rotate the fuel pump relay with the horn relay. the fuel pump may not be getting good voltage which cold weather could affect.
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These simple test might pinpoint the issue towards fuel related.
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The colder it is the more fuel is needed on cold starts.
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