2011 Turbo S with 15K miles. Stock except for x-pipe exhaust installed about 3 months ago. Starting having some initial hesitation under WOT at about 2600-2900 rpm. Difficult to consistently replicate - but there and noticed by service tech when I took him on a test drive.


After 2 days - they can't figure out what the issue is and thus now assume its the plugs. Although CPO warranty - because it is just past the 4 yr mark - stating it is a maintenance issue and thus I cover the costs. To some degree understandable - but on the other hand my understanding is that age really has nothing to do with spark plugs - and replaced after 15K on stock setup? Further if it turns out not to be the plugs - then I just did this for nothing at this time. Not sure if I just need to grin and bear it or if there are other options.


Any advice?

 

Well...With no CEL it is kind of a guessing game. I would agree this is a maintenance item, and that depending on how hard the car is driven, you could have plugs creating the hesitation After 4 years and 15K miles(though could be other things).


WOT sputtering is typically linked to plugs. Again, without CEL's, all you can do is speculate.


If you are handy, you can change them yourself and not incur the big $$ for a plug change.


Other items that may cause hesitation feeling( In no order, and not suggesting this is the case)...Bad Diverter/Recirc valves, MAF sensors flaking out (or over oiled with a BMC filter!), O2 sensor going (Should throw CEL), VTG Actuator rod sticking...


Good luck,
DC