2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.

Misfire on #.8

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Old Aug 7, 2012 | 01:03 PM
  #41  
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Originally Posted by 05xrunner
WTF is an Orange peel delete clearcoat. Do you mean you wetsanded it and buffed it out for a flat uniform clear? I dont think i would call that a mod more of expensive detail.
Was thinking the same thing. But improves the looks nonetheless.
Old Aug 8, 2012 | 10:43 AM
  #42  
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Originally Posted by IHateStangs
My 11 GT is misfiring, I replaced the plug and it's still missing, I am worried about the dealer because I have the "cammed" tune by Jon Lund, and I can return to stock and take it back but I have soooo many mods, they would find some way motto honor it....anyone heard of this
Originally Posted by IHateStangs
17000...I have a warranty, I have removed the tune, im driving it for the week without it and I'm taking it to the dealer, I have a CAI and its a pain to return that to stock because, I strobe wires coming from the firewall hole that the stock airbox goes into...does anyone know if the CAI voids warranties
I recommend taking it to your dealer immediately. They'll be able to perform a thorough inspection and provide you with coverage details.

Originally Posted by pinn
https://mustangforums.com/forum/5-0l...n-failure.html

TSB for this issue is in the first post.
Originally Posted by Derf00
...You may still have a voided warranty but in the event it could be something else, at least you still have a chance they won't void it if it's not the tunes fault.
Originally Posted by Mudflap
Ford can tell that the car was tuned, there is nothing you can do about that. There is a specific TSB out that calls for the computer to be sent to corporate on any car that comes in with #8 issues. The car will throw a CEL with the intake and no tune most likely...
Hey guys -

Thanks for the advice and information! Our factory-trained techs can look at his 'Stang and determine the best course of action. If you all need anything, please shoot me a PM.

Thomas
Old Aug 8, 2012 | 11:03 AM
  #43  
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The problems with the TSB .. and Ford secrecy .. is that if Ford is experiencing #8 failures on 100% STOCK cars then there is a #8 engineering issue. However .. if Ford has a chance to play off the failure on the aftermarket tune to save on the Warranty repair then that is B.S.

I would think Thomas, Deysha, etc ... would be able to tell us how many 2011-2013 have had the #8 failure that were warrantied. That would in and of itself prove that the problem is the 5.0 and not the aftermarket tune. However .. I am sure information like that is Top Secret stuff that Ford would never disclose.
Old Aug 8, 2012 | 12:33 PM
  #44  
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Is the #8 issue present in the 2013 5.0's? While I'm sure we will not be told, I can't help but wonder if the improvements made to the 5.0 were to address this issue.

Yet another reason why I am glad now that I got the 4.6.
Old Aug 8, 2012 | 01:23 PM
  #45  
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So has there been any idea what the real reason is behind the fail? Weak rings? Poor oil supply? I just bought a coyote with 3800 miles on it with one spun rod bearing, Im guessing it may be the rings and as a result burnt a lot of oil , caused pressure drop and spun the bearing.The Ford Tech said the motor ran great, no noise at idle just a slight rattle at high rpm , no misfire etc, plugs are burnt nice and clean too. Im pulling the pistons so Ill see how they look when I get there, planning on at least a new set of rings when I put it back together. Id like to adress the problem while Im in there and not have this pop up again once its all back together.
Old Aug 8, 2012 | 01:27 PM
  #46  
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spend $2500 to get the Boss 302 internals. BEAST right there then twin turbo and push a **** LOAD a power
Old Aug 8, 2012 | 01:40 PM
  #47  
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Originally Posted by Phansm72
So has there been any idea what the real reason is behind the fail? Weak rings? Poor oil supply? I just bought a coyote with 3800 miles on it with one spun rod bearing, Im guessing it may be the rings and as a result burnt a lot of oil , caused pressure drop and spun the bearing.The Ford Tech said the motor ran great, no noise at idle just a slight rattle at high rpm , no misfire etc, plugs are burnt nice and clean too. Im pulling the pistons so Ill see how they look when I get there, planning on at least a new set of rings when I put it back together. Id like to adress the problem while Im in there and not have this pop up again once its all back together.
The only explanation I've seen that seemed direct and with possible high levels of credibility was from AED. They cited 2 main causes, replacing the clutch and not doing a "profile learn" of sorts to the PCM, and the other one was extended WOT runs (5th and 6th gear). They claim the issue is in the stock tune mapping, so it can happen to a bone stock car, but aftermarket tuning and CAIs make it more likely to present itself unless the tuner is aware of the map flaw and tunes it out (which they claim to be able to do)....
Old Aug 8, 2012 | 02:49 PM
  #48  
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Originally Posted by Mudflap
The only explanation I've seen that seemed direct and with possible high levels of credibility was from AED. They cited 2 main causes, replacing the clutch and not doing a "profile learn" of sorts to the PCM, and the other one was extended WOT runs (5th and 6th gear). They claim the issue is in the stock tune mapping, so it can happen to a bone stock car, but aftermarket tuning and CAIs make it more likely to present itself unless the tuner is aware of the map flaw and tunes it out (which they claim to be able to do)....
Hmm so does that mean most of the car with blown #8's had the same strategy? Were all the cars Manual Transmission cars? Not asking Mudflap directly .. just throwing it out to the forum ..
Old Aug 8, 2012 | 02:57 PM
  #49  
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Originally Posted by dmhines
Hmm so does that mean most of the car with blown #8's had the same strategy? Were all the cars Manual Transmission cars? Not asking Mudflap directly .. just throwing it out to the forum ..
I have seen rumblings on multiple forums that PCM code ZFK0 is the "problem child", but I have NO evidence to back that up right now. I keep meaning to research it, just haven't had the time...
Old Aug 8, 2012 | 03:25 PM
  #50  
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Originally Posted by Mudflap
I have seen rumblings on multiple forums that PCM code ZFK0 is the "problem child", but I have NO evidence to back that up right now. I keep meaning to research it, just haven't had the time...
Ouch ... That is my PCM code ...

Most of the #8's seem to be 2011's from what I have seen on the forums ...



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