Hi.
my guess is the ignition coil/coils.

what brands do you guys prefer ?

im close to order som Bosch from rock auto, but wait a little to see what comes here

 

First Pull Some Codes!

As Far as Coils I Think We Covered it Pretty Well in the 2010-2014 Section!

https://themustangsource.com/forums/...qually-549751/

KC

 

what codes are you getting?

 

No code.

used the blue driver obd, but says no errors.

( motor lamp is not on right now.)

i started to clean the fuelfilter today, but has no time to testdrive so far.

 

How many miles/km are on you're 2005 GT, depending on the mileage, it could be time for a spark plug change...

 

what makes you think you are getting misfires, if there are no codes?

 

63000 mls so far

 

I could hear the misfiring.

but could not replicate it later, so got no codes after connecting my obd tester

 

Is the Fuel Fresh?? Could Be a Sticky Injector as Well, Time For Some Techron Additive!

KC

 

If they're the original plugs? I would pull at least a couple and check the electrode tips... If they are the original plugs, you're looking at spark plugs that are now 19 yrs old.

 

Don't Forget The Process!

https://themustangsource.com/forums/...ite-up-522706/

KC

 

Hi.

yes , maybe it`s time to replace plugs and coils. ( but a little early acc. to service book )

see what I can find if it`s the real problem here. ( i will go for motorcraft if available )

 

If you wait until reaching 100k miles as the owner's manual recommends, you risk a much higher chance of your 2-piece design spark plugs separating inside the heads due from carbon build-up on the electrode shields which results in the spark plugs seizing up during the extraction process... Check out the attachment link provided below which explains the flaws of the early S197 spark plug design and proper procedure for maintaining and changing the 2005-early 2008 2-piece design spark plugs...

https://themustangsource.com/forums/...522706/index3/

 

Ok, thanks.

maybe i`ll replace the plugs the comming winter, when my mustang is in store anyway.

……..yes, I know about the 2 piece plugs , and possible problems to unscrew.

 

Also make certain to read the info provided in the attachment link above!

 

Yes , I will.

thank You guys

 

It's always a pleasure

 

Hi again.

After cleaning the fuel-filter the problem has gone. Drive perfect now , and a kind of "new sound" from the exhaust.

New filter is ordered, ............and to be safe I ordered new coils and plugs as well.( all motorcraft )

Have a great summer guys

 

Great news indeed we have some VERY knowledgeable people here!

 

lesson learned: always check the basics first .... we should have mentioned the fuel filter back at the beginning; but codes are also one of the first basics to check