Originally Posted by RedCandy5.0

Its crazy though how many people beat the snot out of their cars when it is 90-100 degrees out and humid. I bet a lot has to do with it.

Originally Posted by BlackOut2k11

I personally baby my car in hot weather, maybe thats why I don't have any issues. But then again I've also personally datalogged my car with the Steeda tune and never recorded any knock events etc... so I'm fairly confident that I'm safe.

Originally Posted by Adam

An increase in ambient temperature should not cause catastrophic failure. I hope Ford tested these engines in much harsher conditions.

Originally Posted by BlackOut2k11

It has something to do with the way the coolant flows. The 4.6 DOHC had the same issue with the #8 hole getting hot. It never resulted in this failure however because the 4.6 is much lower compression and the ring spacing is larger, so the lands are less likely to break.

Originally Posted by Adam

An increase in ambient temperature should not cause catastrophic failure. I hope Ford tested these engines in much harsher conditions.

Originally Posted by Imatk

You can bet they tested them in extreme temps.

And probably beat the crap out of them. I would say they were confident with the motor in its stock form otherwise they wouldn't have released it.

So stock you probably can beat the crap out of it in hot weather.

But in deference to my earlier post if you DO and its stock you don't have to worry about it... if you DO and it's modded... that's another can - o - worms.

Originally Posted by Imatk

This is what happens sometimes when you mod cars.

Was it the tune? Possibly, but if the car was stock you would have no worries and Ford would repair it under warranty.

The simple fact is when you modify ANY car you are taking a chance the that modification will break something.

I don't care if it's a supercharger, cold air intake, tune, or even springs and shocks.

Once you remove that stock part and put on that aftermarket part then you take a chance that something will go wrong.

Vendors will never tell you this because that's their business and it would hurt business... understandable.

But just because A-Car could withstand x,y, and z doesn't me B-Car will be able to withstand the same conditions.

You can make an educated guess, but you never know.

The same holds for unmodified cars. Some break... some don't... it's all matters of circumstance... how the car was driven, how the maintenance was kept up, how the car was built at the factory.

The only difference is... when it's unmodified it's on Ford's dime (or whoever Chevy, Toyota, etc.) but when you mod it... it's on YOUR dime.

It would be great if vendors would offer warranties but sadly most don't... because they know, even though they won't tell you, that you are taking a chance.

I always read people ask what is "safe" for my car and a vendor will tell you, "Well (insert part, tune, etc) is TOTALLY safe because we've used it on 100 cars (or 200 or 400 or whatever) so you don't have a THING to worry about!"

Put simply... you want to be "safe" ? Don't mod your car... and when you do and something breaks don't expect the vendor to take the blame because even if they do (and I don't recall one time where one has) they probably aren't going to pay your bills unless you get an attorney involved.

Originally Posted by 2012GT

Do you drive a Prius?

Originally Posted by 2012GT

Do you drive a Prius?

Originally Posted by cdynaco

What does that mean? That a Mustang owner that chooses not to mod, is completely pumped with Ford factory power, is somehow a Prius owner??

Why don't you meet him at the track and find out.

Originally Posted by 2012GT

My guess is ultimately Ford is going to get a class action on their hands if this problem isn't just isolated occurances and they refuse to assist owners that have tunes. Tune or no tune, their little TSB isn't worth the paper it is written on if owners have the time and patience to take the "one call that's all" route. A 30-40 hp tune isnt going to cause a failure on the same piston in every car. Makes no sense and will ultimately be proven in the court of law.

STEEDA TUNED here...Mark it down Ford

Originally Posted by 2012GT

lol OK

Originally Posted by BlackOut2k11

This is where my thinking is sitting. I would definitely say it was tune related it these motors were blowing different pistons or kicking rods etc... But the fact that it is the same piston every time tells me there is a big weak point in these motors and ford knows about it, and the tune tsb is a CYA move.

This is getting as bad as the 6.0 powerstrokes with the head gaskets blowing. Ford tried pinning that on tunes meanwhile I have personally worked on over a dozen 6.0's with blown head gaskets that have NEVER been tuned.

Originally Posted by BlackOut2k11

This is a good point and it raises a lot of valid claims.

I understand the whole "pay to play" concept, but let me play devil's advocate here for a second. Ovbiously ford is placing the sole blame on the tunes, but since it is the SAME cylinder on EVERY car that has failed, raises the question of a design issue, that they definitely know about. What I want to see is if they will begin to stand behind the issue in the future when they discover that it is a flaw with the design. For all we know the tunes and other mods are merely accelerating something that will eventually happen on the bone stock card regardless. Either way if there's enough failures it's going to start opening eyes and it could eventually open ford up to some legal issues IF (and only IF) it can be proven that there is a design flaw playing a part here.

I wonder if we should have everyone with a tune on their 5.0 pull the #8 plug and see if that cylinder is running lean in comparison to other cyliners.

Originally Posted by MRGTX

unas2k5, You are seriously overdue for some good luck... What a pisser. Thanks for sharing your pics and experience. You're adding greatly to our collective understanding of this problem... sorry that it's at your expense though! Good luck.

I'm telling you guys- you can get used to the stock tune again. I have been running mine stock for the past 1000 miles and I have already forgotten how much better it ran with the Bama tune!

Originally Posted by unas2k5

No, never sprayed it and no spirited driving that day...



Thanks guys for your input.



BRENSPEED says its a motor issue and NOT THE TUNE.


One of my friends who use to work for Ford says that he can hook it up to his computer and read the tune for me. What info do you guys want to know that may give us a better understanding of the issue?

Would thisMMR Street Mod 1000 Rotating Assembly for 2011/2012 5.0 solve the cyliinder 8 issue for good?

Originally Posted by thelastsumurai

I am going to pull them at my first opportunity take some pics and post to Nr 8 Spark Plug thread or start one.. By the way my 5.0 is bone stock with 13,000 miles on it.