Originally Posted by JAJ

Actually, I think that the OP answered his own question: the symptoms are more consistent with a hydraulic lifter that leaked down than anything else.

Originally Posted by wproctor411

Thought about new filter and oil? See lastsamuri's post above. If your car is stock go to dealer ASAP.

Originally Posted by Rob72

ISSUE WARRANTY STATUS: Eligible Under Provisions Of
Some 2011 Mustang vehicles equipped with a 5.0L New Vehicle Limited
engine and built on or after 8/17/2010 may exhibit a Warranty Coverage
piston rattle noise in cold ambient temperatures of IMPORTANT: Warranty
10 degrees Celsius (50 degrees Fahrenheit) and coverage limits/policies are
below. The noise normally occurs in the 2000-3500 not altered by a TSB.
RPM range and will decrease as engine Warranty coverage limits
temperature warms up. An update of the powertrain are determined by the
control module (PCM) calibration to reduce intensity identified causal part.
and duration of the noise is now available.
OPERATION DESCRIPTION TIME
110704A 2011 Mustang: Reprogram 0.3 Hr.
ACTION
The PCM (Do Not Use
Reprogram the PCM to the latest calibration using
With Any Other Labor
IDS release 73.04 or later. This new calibration is
Operations)
not included in the VCM 2011.5 DVD. Calibration
DEALER CODING
files may also be obtained at www.motorcraft.com.
CONDITION
NOTE BASIC PART NO. CODE
RECAL 04
PLEASE ADVISE THE CUSTOMER THAT THIS
VEHICLE IS EQUIPPED WITH AN ADAPTIVE
TRANSMISSION SHIFT STRATEGY WHICH
ALLOWS THE VEHICLE’S COMPUTER TO LEARN
THE TRANSMISSION’S UNIQUE PARAMETERS
AND IMPROVE SHIFT QUALITY. WHEN THE
ADAPTIVE STRATEGY IS RESET, THE
COMPUTER WILL BEGIN A RE-LEARNING
PROCESS. THIS RE-LEARNING PROCESS MAY
RESULT IN FIRMER THAN NORMAL UPSHIFTS
AND DOWNSHIFTS FOR SEVERAL DAYS.

Originally Posted by wesslvm

Pardon me, but I don't spend a lot of time on this forum and I work rotating 12 hour shifts so hopefully I don't come off too arrogant...

I think you are trying to be helpful.

I overhauled my first motor in' 75.

I don't believe lack of oil pressure can cause misfires on startup, try to explain that to me.

The car is going to the dealer in the morning

Originally Posted by thelastsumurai

Hard starts and Knocking....That was your first post and that is what we are talking about...misfires are a different matter...Get back to us when you get back from dealer..curious to see what caused the misfire...

Originally Posted by thelastsumurai

All we are trying to do is to educate you before your dealer says "normal operating characteristic"...Sorry if you are offended just tring to help. That is why you posted in the first place right?

Originally Posted by wesslvm

Thanks Rob72. Is this type info available on-line and if so where?

Thanks