Code P0301; Misfire in Cylinder 1 - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 12-11-2010 Thread Starter
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Code P0301; Misfire in Cylinder 1

Hey guys I had this code show up before so I replaced all the sparkplugs and wires and my car was fine for a day but then started misfiring again and like 2 weeks later the "Check Engine" light came on again and it was the same code! So it can be the coil pack or fuel injector but I want to know how can I check to be sure and also could it be another problem?? There is a crack/leak in my exhaust so you hear air escaping from where the cats should be at. I'm not sure if that could be the cause of all this?


My Old 2004 V6 Mustang 3.9L
15.9 sec @ 88mph
2008 - May 2009 R.I.P.

My Current 2001 V6 Mustang 3.8L
17.0 sec @ 83mph
August '09 - Now

Both were stock during those races
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post #2 of 5 (permalink) Old 12-11-2010
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I am assuming this is the ONLY DTC code. If so, it is unlikely to be a bad coil pack. Why? Because cylinder #5 would be affected as well.

Have the alternator tested for excessive AC ripple. Autoparts store will test for free.

OP states new plugs and wires. How about the routing of the wires? Did you follow factory routing? Use all looms and standoffs?

Try this old racers trick. Run the car in a totally dark location. Look for the blue hue of arcing.

As for other things that could affect a single cylinder, a bad fuel injector or base engine problem (value/low compression).

This could also be a cam sensor problem.

If the car immediately improved after replacing the plugs and wires and then started acting up again, my vote is acring caused by incorrect spark plug wire routing.


2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #3 of 5 (permalink) Old 12-11-2010 Thread Starter
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Well I took it to a mechanic shop to get the wires and new sparkplugs installed and I watched them do it to make sure every wire is in the right spot so I know its not that especially since I had this problem before I even changed the wires.

Having the alternator tested is something I havent thought of so i will try that today

And I dont even know what this mean "Look for the blue hue of arcing"

And I might have to change the fuel injector soon just to be sure

My Old 2004 V6 Mustang 3.9L
15.9 sec @ 88mph
2008 - May 2009 R.I.P.

My Current 2001 V6 Mustang 3.8L
17.0 sec @ 83mph
August '09 - Now

Both were stock during those races
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post #4 of 5 (permalink) Old 12-11-2010
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Consider using an injector cleaning/flow test service such as injectorrx.com. Once cleaned, the injectors are as good as new.

What do you think an electrical arc would look like? Hint. It's blue.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #5 of 5 (permalink) Old 12-12-2010
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Also, try pulling the plug on the #1 cylinder. It can tell you alot by the way it looks......

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