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JBANKS
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Oct 26, 2012, 9:29 AM
Post #1 of 13
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I have a 2004 F-250, 6.8L auto trans. I started the truck and it ran extremely rough (no problems prior) when i got to the end of my block (about 500ft) it shut off. it restarted without a problem but still ran like crap. I turned around and pulled the codes and got P0316 misfire on start-up first 1,000 revolutions, and P0720(pd) output shaft speed sensor circuit. Any ideas where i begin repairs? thanks
JBANKS
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Hammer Time
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Oct 26, 2012, 10:11 AM
Post #2 of 13
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Re: trouble codes
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How many miles?
When were plugs changed last?
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JBANKS
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Oct 26, 2012, 3:56 PM
Post #3 of 13
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Re: trouble codes
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it has 154,000 gets a tune up every 30,000 so it's due but i think it's strange for that to just come out of nowhere. Truck has been running fine, it sat for 2 weeks then this. Don't know if you read my previous post about the "bang" when i start it sometimes. Could it be related? and what's with that P0720(pd) code?
thanks
JBANKS
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Hammer Time
Ultimate Carjunky
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Oct 26, 2012, 4:04 PM
Post #4 of 13
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Re: trouble codes
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The 720 is a transmission speed sensor code and nothing to do with the engine problem so that is a subject for a different thread. If you are changing plugs in that engine every 30K, you are throwing money away. They are scheduled for 100K but 70-80 would be more reasonable.
You may have a coil that failed which is quite common but you are going to need more info from the computer to determine which cylinder is doing it.
PS, Make absolutely sure that you are not using Bosch Platinum plugs. They will not work in that truck. Motorcraft is the only brand you should be using.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Oct 26, 2012, 4:06 PM)
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JBANKS
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Oct 27, 2012, 11:46 AM
Post #5 of 13
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Re: trouble codes
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Thanks, yeah i only use motorcraft plugs and it was #3 cyl missing. Is there a way to test the coil besides the "spark for now" test? and is that a "replace them all" repair?
thanks
JBANKS
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Hammer Time
Ultimate Carjunky
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Oct 27, 2012, 12:01 PM
Post #6 of 13
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Re: trouble codes
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You can swap that coil with a different cylinder, clear the codes and see if the miss moves to the other cylinder.
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JBANKS
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Oct 27, 2012, 2:18 PM
Post #7 of 13
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Re: trouble codes
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Thanks, will do and i'll let you know. Thank you
JBANKS
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JBANKS
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Oct 31, 2012, 6:23 PM
Post #8 of 13
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Re: trouble codes
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CHANGED ALL PLUGS, SWAPPED #3 AND#4 COILS DROVE ABOUT 1/2 MILE, SAME THING. SCANNER NOW SAYS 3 AND 4 ARE MISSING. IT ACTS LIKE A CAT CONVERTER ISSUE AND HAVING A CHEAP SCANNER ISN'T HELPING EITHER. ANY OTHER IDEAS BEFORE I TURN IT OVER TO FORD? OH AND I DID REPLACE THE #3 AND#$ COIL PACKS. SAME THING.
JBANKS
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Hammer Time
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Oct 31, 2012, 6:37 PM
Post #9 of 13
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Re: trouble codes
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You would just have to go on a discovery mission checking basics like fuel pressure, vacuum and fuel adaptives all during the warm up period that is the problem window.
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JBANKS
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Nov 1, 2012, 10:47 AM
Post #10 of 13
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Re: trouble codes
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I GUESS I SHOULD HAVE SWAPPED #2  COILS. IT WAS #2 THAT WAS BAD ($160 BUCKS LATER). IN MY OPINION IF YOU HAVEA B.S. SCANNER (CODE READER) TOSS IT! IT'LL JUST COST YOU MONEY. THANKS FOR YOUR HELP, THIS SITE IS GREAT!
JBANKS
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Hammer Time
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Nov 1, 2012, 2:02 PM
Post #11 of 13
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Re: trouble codes
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Haha, you learned something today.
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Sidom
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Nov 1, 2012, 6:45 PM
Post #12 of 13
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Re: trouble codes
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As HT mentioned, you don't need to change the plugs as often as you have been.
I don't know if you are changine the coil boots when you are changing the plugs but that would be a good idea.
They do go bad and it acts the same as a bad coil.....
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JBANKS
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Nov 2, 2012, 2:14 PM
Post #13 of 13
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Re: trouble codes
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yup, just learned that too. again thanks for the help i really appreciate it
JBANKS
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