2012 5.0 misfire and loss of compression
08-21-2014, 12:29 PM
#12
Senior Member
Bumping this because I want know what it is and hear how you make out (and so I can find this thread later)
I can't see a cat-back voiding anything... or probably 50% of the new trucks here in TX would have a voided warranty. lol. I think the service tech was thinking it might have also been tuned when he pointed at the muffler and mentioned a tune. You denying it probably took the wind out of his sail whether he expressed it or not. He is not going to take your word for anything. Once he confirms the truth (tuned vs not) that will likely make or break it as a warranty claim. ^Just my thoughts and opinion.
Someone else mentioned a foreign object... What exactly was this "vacuum leak" they fixed? Where was it located? Vacuum comes from the manifold, therefore anything that travels up the tube goes to the manifold... and into the cylinder.
I can't see a cat-back voiding anything... or probably 50% of the new trucks here in TX would have a voided warranty. lol. I think the service tech was thinking it might have also been tuned when he pointed at the muffler and mentioned a tune. You denying it probably took the wind out of his sail whether he expressed it or not. He is not going to take your word for anything. Once he confirms the truth (tuned vs not) that will likely make or break it as a warranty claim. ^Just my thoughts and opinion.
Someone else mentioned a foreign object... What exactly was this "vacuum leak" they fixed? Where was it located? Vacuum comes from the manifold, therefore anything that travels up the tube goes to the manifold... and into the cylinder.
08-21-2014, 01:22 PM
#13
He said the vacuum melted on the exhaust. They are pulling the motor now and he said they had compression lost in 3 cylinders. This guy also said since the resonator was removed the warranty would probably be voided but they won't know till they take apart the motor.
08-21-2014, 01:30 PM
#14
Senior Member
That's major BS. your truck engine was running perfectly fine before you brought it to the dealer right? No CELs or anything? The problem only came up after they worked on your truck and there shop and happened all on there time. If I were you I would be making sure that the dealership paid every penny of the repair.
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Ledfoot (08-26-2014)
08-21-2014, 01:33 PM
#15
Retired and loving it!
They have to prove that the installed aftermarket product was the proximate and direct cause of the OEM part's failure.
For example, if you install an oiled air filter and you over oil it, and your mass air meter is contaminated and fails, you are going to be on your own ticket for the repair costs.
But a motor losing compression because there is no resonator in the exhaust? That is as related to each other as if your radio failed.
You did reinstall all of the o2 sensors correctly, right? If the engine overheated for some reason related to the exhaust install, then I may be able to see the dealer's point of view.
Last edited by Adobe2X; 08-21-2014 at 05:36 PM.
08-21-2014, 01:34 PM
#16
Senior Member
Man, best of luck to you, keep us updated please.
I'm only working with info I've read, but...
Go poke your head under a Reg Cab Short Box. I don't think they even have a resonator in stock form followed by the same cat back as everyone else. Maybe someone else can confirm this? I don't want to be spreading any misinformation. Aside from that, the resonator is just a straight through pipe - the OE muffler was as well. If you monkeyed with the cats, or anything forward of the o2s, I could see them trying to have an issue with it... but if that's all stock, then I just don't see it. But then again, I'm not Ford though I'd love to hear their logic.
I'm only working with info I've read, but...
Go poke your head under a Reg Cab Short Box. I don't think they even have a resonator in stock form followed by the same cat back as everyone else. Maybe someone else can confirm this? I don't want to be spreading any misinformation. Aside from that, the resonator is just a straight through pipe - the OE muffler was as well. If you monkeyed with the cats, or anything forward of the o2s, I could see them trying to have an issue with it... but if that's all stock, then I just don't see it. But then again, I'm not Ford though I'd love to hear their logic.
08-21-2014, 01:50 PM
#17
Sensors and cats were never touched bolted the exhaust on right before the resonator and it's not a hack job. Sorry they actually said minor compression lost in 3 cylinders and major loss in one. never saw the check engine light on before.
08-21-2014, 02:35 PM
#18
Senior Member
If its exhaust related, I just can't see how thousands of trucks are not having this issue.
...and Mustang GTs, an exhaust is like the first thing those guys do.
I'm also bothered by this because I have a MF cat-back system sitting in a box in my garage that I was wanting to install this week... and now... I'm not so sure.
...and Mustang GTs, an exhaust is like the first thing those guys do.
I'm also bothered by this because I have a MF cat-back system sitting in a box in my garage that I was wanting to install this week... and now... I'm not so sure.
08-21-2014, 04:50 PM
#19
I'm no motor guru but having half the cylinders low on compression and only having the exhaust on for maybe 1,500 miles, i feel something major happened? I drove 400 miles the weekend before to pick up new rims and tires not a problem. Drove 20 miles to the ford dealer that's on my way to work and never noticed anything. I ran E85 through it about one tank ago also not sure if that would have any correlation...