Ford's Latest TSB: Don't Mod The 5.0 Mustang?

Ford has tidal waves throughout the Mustang modding realm this week,
issuing a new Technical Service Bulletin (TSB) to dealers that
essentially says, =93If an owner has modified their 2011-2012 Mustang
5.0 drivetrain, their warranty is void=94.
TSB 11-7-7 warns Ford Service Departments that when servicing
2011-2012 Mustangs with the new 5.0 liter engine, to look for
modifications the owner may have made before covering a list of engine
and drivetrain failures.
The new 5.0 liter 32V DOHC Coyote engine has been widely received as
one of the best new engines Ford has ever produced. But what a lot of
shade tree mechanics don=92t know or overlook is that this high
compression engine is near maxed out structurally at is factory
specified power output.
The TSB warms that common modifications done by a lot of owners that
increase the power output can cause premature failure of not only a
number of engine components, but drivetrain systems like clutch and
Ford has been in the business of encouraging its owners to customize
their cars in the past decade, in fact even offering a raft of
products though their dealers to do just that. But the company is
sending out a warning shot that they will be voiding warranties if it
is determined that modifications made by the owner are the cause of
In the TSB it outlines a number of common modifications that can cause
engine and drivetrain failures:
=95 Custom PCM Software Calibrations
=95 Air induction system (air box, air filter, zip tube)
=95 Super chargers
=95 Nitrous oxide systems
=95 Throttle bodies
=95 Exhaust air path/system
The TSB outlines potential damage line items that can be caused by the
above modifications:
=95 Excessive Cylinder Pressure And Temperature
=95 Piston damage
=95 Spark over-advanced (knock-induced damage)
=95 Insufficient enrichment
=95 Catalyst damage
=95 Piston damage
=95 Connecting rod damage
=95 Oil pump damage =95 Catalyst damage
=95 Clutch damage
=95 Piston and/or ring damage due to improper knock
The figure below shows the decision path that technicians are to take
when diagnosing problems with a car. If you follow along, the end
result is cancelation of the warranty if it is deemed that damage or
failures are caused by any number of modifications listed above.
What this means people is that Ford has given their dealers the legal
green light to begin blackballing Mustang owners for modifying their
cars. So if you are an owner of a 2011-2012 Mustang with a 5.0 liter
engine and have been loading it up with custom tunes and other
aftermarket power adders be aware. You might think twice about heading
down to your local dealership complaining about your broken clutch or
rough idle.
While this TSB is a bit unsettling, the rules have not changed.
Modding your Mustang from a powertrain standpoint has always carried
with it some inherent risks. The new 5.0 engine is one of Ford=92s best
but people need to learn that with its high compression, it is already
tuned to top capacity from the factory when it comes to reliability.
Mod with care.
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If you read their Ford Performance Parts Warranty, it still says they wont cover damage CAUSED by SC, TC or nitrous oxide.
Reply to
I think that has always been the case, unless you buy the mods and have them done by a ford shop. Why should ford guarentee the work of others?
I still like the old fox body, 93 and modding them, it was easy, just took some money to do it.
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This has been policy for decades.
All of these can cause problems if done wrong.
If there was a URL to see this I missed it, anyway this is essentially what I figured. A chart that helps explain cause and effect of bad modifications which would be clear to any decent mechanic. Someone comes in with a nitrous system and and busted connecting rod through the block it's pretty obvious what happened.... That's what this TSB apparently is. If it was a no-mod policy there would be no need to have a chart to show this-leads-to-that.
Um no. It means you have to do your mods with intelligence and not mess up the car. It's perfectly reasonable. Ford is just reinforcing that they aren't going to pay for it if a dealer is nice enough to put it under warranty.
It's essentially a message to dealers that ford isn't going to pay for things that aren't ford's fault. I'll wager a number of dealers have been putting things on warranty claims that were the result of poorly thought out modifications and/or outright abuse. Broken parts or even entire broken products often end up in the hands of the development engineers... not just corporate paper pushers... and they can tell how the user broke it. A company may choose to still cover it under warranty but that doesn't mean people working there don't know what happened. There may even be a choice to reinforce the area, but that may be just because it's cheaper to do that than deal with the bad feelings. Ford is simply sending a message that its good-will is limited.
No. Same rule of thumb as always. The package from Jim-Bob's Supercharger's and Things may be cheaper or make more power but it will not likely be as well engineered or tested for durability and reliability as a package from Ford Racing or any of the other well established and respected aftermarket companies. Bring a car in with Jim-Bob's garage machined supercharger on it and the mechanics find your problem is due to a screw that came off the inside of the supercharger and bounced around inside the engine... no warranty for you. Same as always.
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