spitting code

ForestGRN_Ghost · August 20th, 2009, 11:04 PM

p0305 misfire in cylider 5.

is it more likely to be coil. or actual spark plug.
just want to know before i go out and by one or the other.
or maybe both.

KevinJ99GT · August 20th, 2009, 11:15 PM

i would try plug first, 3 bucks is better than whatever a coil is.

Mustang46 · August 20th, 2009, 11:16 PM

Diagnostic Trouble Code (DTC) p0305
DTC Definition: Cylinder 5 Misfire Detected

this could be both or one or the other. you can switch the COP with another cylinders COP and see if the code switches cylinders. If it don't it could be the plug.

usmcgrunt · August 21st, 2009, 11:10 PM

I had the exact same problem in mine. I ended having to change out the 5 and 6 cop's. Try changing that plug first... its cheaper. If you are going to swap out the cop with one from a different cylinder, I'd recommend you use one from the 1-4 bank of the engine. Also, if you have to replace a cop, an you can afford the few extra bucks, go with the OEM from the dealership. Its worth it to use a factory cop.

ajm · August 21st, 2009, 11:22 PM

Use a little critical thinking.

Check the coil with a dvom. If readings are horribly off chances are its shot. If not go to next step.

Swap plug, coil, and injector from #5 with plug,coil, injector from xxx cylinder.

If the code comes back on the cylinder you switched to change the plug.

It the code comes back again to xxx cylinder you changed to check the coil and injector once again. Chances are it would be the coil as the mechanical failure rate of injectors is extremely low. That should solve your problem.

If the miss still comes back on cylinder 5 after swapping coil & plugs with another cylinder chances are the problem is beyond something simple as a plug, coil, or injector.

BakerFX4 · August 22nd, 2009, 12:01 AM

yeah i think you pretty much answered your own question in your original post. cant be much to it and the most i see this costing to fix... ehhh... 10 bucks.

ForestGRN_Ghost · August 22nd, 2009, 12:34 AM

thank all

Lefty · August 22nd, 2009, 12:53 AM

That's what we're here for

August 20th, 2009, 11:04 PM	#1
ForestGRN_Ghost Enthusiast 99 mustang GT Join Date: Apr 2009 Location: spokane Posts: 993 iTrader: 0 reviews	spitting code p0305 misfire in cylider 5. is it more likely to be coil. or actual spark plug. just want to know before i go out and by one or the other. or maybe both. __________________

August 20th, 2009, 11:15 PM	#2
KevinJ99GT Enthusiast 1999 Mustang GT 8.30 1/8th mile Join Date: Jun 2008 Location: Walnut Ridge, Arkansas Posts: 866 iTrader: 0 reviews	i would try plug first, 3 bucks is better than whatever a coil is. __________________ - full bolt on's, hitech stage 2's, zex 100 shot

August 22nd, 2009, 12:01 AM	#6
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 15,607 iTrader: 14 reviews	yeah i think you pretty much answered your own question in your original post. cant be much to it and the most i see this costing to fix... ehhh... 10 bucks. __________________

August 22nd, 2009, 12:34 AM	#7
ForestGRN_Ghost Enthusiast 99 mustang GT Join Date: Apr 2009 Location: spokane Posts: 993 iTrader: 0 reviews	thank all __________________

August 22nd, 2009, 12:53 AM	#8
Lefty The Doctor '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 27,386 iTrader: 11 reviews	That's what we're here for __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

August 20th, 2009, 11:16 PM	#3
Mustang46 Enthusiast 2002 Mustang GT Join Date: Jun 2009 Location: Franklin, Ohio Posts: 885 iTrader: 1 reviews	Diagnostic Trouble Code (DTC) p0305 DTC Definition: Cylinder 5 Misfire Detected this could be both or one or the other. you can switch the COP with another cylinders COP and see if the code switches cylinders. If it don't it could be the plug.

August 21st, 2009, 11:10 PM	#4
usmcgrunt Newbie 1999 Mustang GT Join Date: Aug 2009 Location: Camp Lejeune, NC Posts: 11 iTrader: 0 reviews	I had the exact same problem in mine. I ended having to change out the 5 and 6 cop's. Try changing that plug first... its cheaper. If you are going to swap out the cop with one from a different cylinder, I'd recommend you use one from the 1-4 bank of the engine. Also, if you have to replace a cop, an you can afford the few extra bucks, go with the OEM from the dealership. Its worth it to use a factory cop.

August 21st, 2009, 11:22 PM	#5
ajm Banned Join Date: May 2008 Posts: 7,970 iTrader: 4 reviews	Use a little critical thinking. Check the coil with a dvom. If readings are horribly off chances are its shot. If not go to next step. Swap plug, coil, and injector from #5 with plug,coil, injector from xxx cylinder. If the code comes back on the cylinder you switched to change the plug. It the code comes back again to xxx cylinder you changed to check the coil and injector once again. Chances are it would be the coil as the mechanical failure rate of injectors is extremely low. That should solve your problem. If the miss still comes back on cylinder 5 after swapping coil & plugs with another cylinder chances are the problem is beyond something simple as a plug, coil, or injector.

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