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Discussion Starter · #1 ·
Ok, so I have had my 2012 5.0 with 16,000 miles for about a year now and I've loved every second of it. Recently, though, I have been having some very frightening issues with it. About a month ago it started. My only mods on the car were BBK After cat X-pipe, and SLP LM Axlebacks. I was driving to the grocery store and everything was fine until I pulled up to a stop light. The car started idling very low and stuttering, then threw a check engine light soon after. I drove the car about 30 feet into the parking lot shut it off, waited for about a minute and started it back up. Everything was fine, check engine light was off and the car ran great again. Weird... So everything was fine up until just 2 days ago. Since the first incident I had swapped out the BBK After cat X to a lethal O/R H, and on my way home from work I was taking off from a red light shifted from first to second, fine. second to third and BAM the car had a little wrench on the gauge cluster next to the speedo (Which I later found out means the car went into "LIMP HOME MODE") It just started bogging and shuttering terribly, and wouldnt accelerate at all no matter how much gas I gave it (I'm driving in 5 o'clock traffic keep in mind), so I shut off the car and immediately turn it back on and the car backfired VERY LOUD and kept popping for a bit then everything returned to normal and has been fine again until tonight when leaving a restaurant the car said CHANGE OIL SOON on the display for the mileage and other info, but I just got the oil changed 1,000 miles ago, and the car was running great, so I have no idea what is going on with this damn car, but hopefully someone here can be of some assistance to me. This is really a bummer because I have a tuner in the mail, but now I'm afraid to install it :uhh:

P.S. Checking the oil after I post this
 

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How about your air flow sensors?

We had a 04 v6 stang that seemed to do the same thing. And I thought it was bad plugs at first, but turned out to be sensors. It did it with low miles too
Good luck, hope gets fixed, at least you have warranty
 

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I definitely wouldn't flash that thing until the dealer looks at it.
 

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If they see no cats on your girl, you can bet your bottom dollar that your warranty is done. Period.
 

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The Blue Dragon
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Put back to stock and take it to the dealer. There have been a number of issues with what you're experiencing on the 13's and a simple crank relearn did the trick, I'm not sure if its happens with the 12's or not. But it's under warranty so let ford fix it
 

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I'm thinking its a sensor of sorts. My V6 acted similar when the throttle position sensor went off; I'd be taking from a light 2nd to 3rd and bingo limp home would come on. I own a scanner, and decided to scan it while it was running because after turning it off and back on it would clear the code.

Good Luck I hope you get it fixed!

---------- Post added at 08:55 AM ---------- Previous post was at 08:54 AM ----------

You don't need a tune for a off road mid pipe. The only thing the tune will do is make sure you don't get a CEL.
That's what I thought.
 

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You don't need a tune for a off road mid pipe. The only thing the tune will do is make sure you don't get a CEL.
It will also keep the ECU from dumping fuel to cool the cats that aren't there. I thought these could also run slightly lean if the tune wasn't adjusted for the lack of cats, but I haven't seen hard proof either way.

Regardless, this doesn't sound like an exhaust related issue at all. I would check out your intake tract, vacuum lines, etc and make sure nothing is loose under the hood. If everything looks good, I would throw the stock cats and H pipe on and take that bad boy to the dealer for service.

Also, what code was causing the CEL? You should be able to check this with your tuner (without installing the tune) or by using the free OBD-II scanner at any major parts store.
 

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Sounds like its definitely missing on one or more.
 

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Discussion Starter · #15 ·
I do have an O/R H and no tune. I was getting the tune soon after (only had the H pipe for about 2 weeks, and I figured it would be fine. On Lethal Performance's website they said the only problem without the tune is that your gas mileage will be poor because of the fuel dumping to cool the cats which aren't there, and some performance loss, because of it running so rich. I'm getting all aftermarket exhaust parts swapped out at noon, and I will be taking it to the ford dealer soon after. I will keep you guys posted, thanks for all your help.
 

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Good stuff bro. Good luck at the dealer, and if they ask questions, admit to nothing lol.
 

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Discussion Starter · #17 ·
Ok, so i just got back from ford after putting the entire exhaust system back to stock. They ran all the diagnostics and everything was fine. I'm guessing that the O/R H without a tune on top of the lack of backpressure from the basically straight piped exhaust was causing the problem. I will be keeping the stock axleback and reinstalling the O/R H pipe this time with the tune. i will keep you posted after I install the tuner and hopefully everything goes smoothly. Thanks again to everyone on here, I really appreciate you guys!
 

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fg2_matt said:
Ok, so i just got back from ford after putting the entire exhaust system back to stock. They ran all the diagnostics and everything was fine. I'm guessing that the O/R H without a tune on top of the lack of backpressure from the basically straight piped exhaust was causing the problem. I will be keeping the stock axleback and reinstalling the O/R H pipe this time with the tune. i will keep you posted after I install the tuner and hopefully everything goes smoothly. Thanks again to everyone on here, I really appreciate you guys!
I wouldn't do that, I don't think the non tuned o/rh was your problem.
 
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