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Unread 08-23-2013   #1 (permalink)
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Default 2014 Mustang GT Start Issue

Hey everyone. Haven't really done an intro thread yet but I'm kinda freaking out and I'm really hoping someone can shed some light on an issue I'm having.

I have a 2014 Mustang GT. Just got it last Friday and have put about 640 miles on it so far. The issue is that at random times, it has trouble starting up. I don't know the mechanical term for what it's doing but I guess I'd call it sputtering. I just know I turn the key and it takes a while before it finally fires up. Once it's running, it runs fine. Idles smoothly and has good power. The only mod I've done so far is adding the Roush axel back exhaust. I tried searching and didn't see anyone having a starting issue as a result of this install. I also only put Premium in it. Checked the systems in the track apps screen for whatever that's worth and they're all green. I called the local dealerships but none of them can see my car before Monday and I'd really like to get it figured out as soon as possible. Any help would be greatly appreciated.

Thank you.
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Unread 08-23-2013   #2 (permalink)
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Well, the exhaust would have nothing to do with the problem.

I'd say to change where you buy gas and see if that helps, but it isn't going to be an immediate change unless the tank is empty now.

Best thing to do is just wait and let the dealer look at it.
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Unread 08-23-2013   #3 (permalink)
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Really dreading leaving it with the dealer but guess it'll be worth it to fix my baby.

Could be a stupid question but is it ok to use gas that has up to 10% ethanol in it? Would that cause start up issues? Thank you.
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Unread 08-23-2013   #4 (permalink)
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Quote:
Originally Posted by PrimpPony View Post
Really dreading leaving it with the dealer but guess it'll be worth it to fix my baby.

Could be a stupid question but is it ok to use gas that has up to 10% ethanol in it? Would that cause start up issues? Thank you.
Most all the gas here in Texas is E10(10% ethanol) and my car starts first turn every time.
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Unread 08-23-2013   #5 (permalink)
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Its getting to the point that if you want ethanol free gas you have to go to a marine gas station, and pay through the nose. 10% or less isn't causing the issue you're having though as above it could be a bad batch of gas. Try filling up at a different station/brand and use 93 octane, see if that helps the problem. If there is a cel you can check the codes at a local parts store for free, and the codes would be helpful to find the cause. Definitely not a common issue you're having, but shouldn't be too difficult to figure out and resolve.
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Unread 08-23-2013   #6 (permalink)
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If it happens only when cold, could also have a vacuum leak somewhere. For such a new ride, if it's definitely repeatable at-will, when cold after overnight stay, take it back to the stealership, and have them find the issue, by having them start it up first thing in the morning when they come in before the sun heats up things. 640 miles... sheesh.... loose hose somewhere that sucks air and causes a stumble until it seals up from heat expansion. Why bust your buns on it? Let them figure it out.

If it stumbles on first start, try this to see if it helps.... priming the fuel pump to build up pressure in the fuel line before starting. The pressure really shouldn't bleed off that bad overnight, but give this a whirl anyway:

1. Turn key on but not on start position, listen for pump noise, priming.
2. Turn key off, wait 2 seconds, turn key on but not start position, probably won't hear much as fuel pressure has built up
3. Do the same thing a 3rd time just to make sure pump has built up pressure.
4. Start the car, and listen for the stumble. Could be an initial fuel delivery/pressure issue, transient in nature once pressure builds up.

Still should take it in since the pressure shouldn't bleed off that badly unless the car sits for a way-long time.
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Unread 08-25-2013   #7 (permalink)
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Make sure you allowing it to prime. Let the gauges go all the way to the right and back before you turn the key.
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Unread 08-28-2013   #8 (permalink)
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Thanks for the replies guys. I'm finally going to take it in to the dealer on Monday. I tried to wait a bit and see if it would fix itself. I thought it was getting better but I went out to start it today to move her in the garage and it hesitated again. Really hoping it's something simple that they can fix quick. Hard to enjoy my brand new car when it's acting up.
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Unread 08-29-2013   #9 (permalink)
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I had to have my starter replaced in my 2011 GT at about 7k miles. I was having odd issues with long cranks and sometimes it would give me a grinding that was insanely loud. They replaced the starter the same day, and the problem has gone away.
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