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Discussion Starter · #1 ·
Hello all,
2017 ecoboost mustang just under 36k miles on it, over 5 years old so out of warranty.
the past few weeks the check engine light has gone on for a day or so then shut off.
Yesterday while driving it for a second the car hesitated and engine overheat message showed on the dash. But it only did this for a second and ran fine after that. I got it home checked fluids and the overflow was almost empty.
Went to the auto parts store had them check the codes
P0234
P0304 codes showed
Got antifreeze headed home and about a mile from the house, the temp gage went from normal to all the way to hot and a message
Engine coolant over temperature showed on the dash. I pulled over shut it off and waited about 20 minutes. Checked the oil, not milky
No signs of a leak anywhere. Drove it the mile home and let it rest/cool down.

about 4 hours later i filled the overflow reservoir with coolant. Started it up and instantly the “engine coolant over temp” message showed on the dash and the temp gage went right to hot.

i let it run for a few seconds thinking the overflow might pump fluid through the system but it stated on hot. So i shut it off.

i called the local ford dealer and am going to have it towed to them.
I am assuming blown gasket? Besides for this, its runfine. Once i started it and saw some white smoke from the exhaust, but besides that its run and idled and seemed fine.

so just trying to get an idea on possible issues?
Blown gasket? Motor damage?
i figured i would let it cool for a bit longer? Maybe Overnight? And then try starting it to see if it still shows hot? or am i only doing further damage and should just tow it to the dealer?

assuming blown gasket? Any idea on costs?
Is it possible there is engine damage?

ive had the car since it was new, never a problem, no mods at all always changed oil and used super. At 35,650 miles i am kind of disappointed with such a potentially large repair bill.

Any thoughts and or ideas on costs to repair this with either good case scenario or bad case scenario?

And dealer required/suggested or could i bring it to the neighborhood shop?

Thanks In advance for any info/suggestions.
 

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2016 Mustang Ecoboost, 6-speed manual, premium
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I'd certainly get the dealer to take it in since you should still be within warranty. Our early ecoboosts have a known issue of the head gasket failing in such a way that they leak on the outside of the cylinder head, so the coolant will burn off before you run hot and look to see anything. Mercifully, this means your bottom end may not be in trouble (yet) but best not to drive it till you know for certain.
 

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Yes, blown head gasket.

And yes, now that you've overheated it, likely engine damage.

From the codes, the head gasket went out between cyl 3 & 4 and has been leaking antifreeze into cyl 4.

You'll likely find if you take it to the dealer that they won't cover anything because Ford's dealer network sucks. They'll also tell you that you need a new engine assembly and want a lot of money for that.

Good luck.
 
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Doesn't sound good. Let us know what you find!
 

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Discussion Starter · #7 ·
Thanks, unfortunately drive train warranty is for 5 years or 36k and i a bought it in 12/16 so i dont think it would be under warranty. Thanks guys i will let you know.
i was hoping there was some sort of bulletin or recall to cover this.
 

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Thanks, unfortunately drive train warranty is for 5 years or 36k and i a bought it in 12/16 so i dont think it would be under warranty. Thanks guys i will let you know.
i was hoping there was some sort of bulletin or recall to cover this.
There are some pretty simple test you can make to confirm coolant loss and several good "how to video"s on YouTube.
How much coolant did you have to add? And did you search for any external leakage?
Any other codes recorded other than P0234 and P0304??

PS: Also, is the oil level on the dip stick higher than normal?
 

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Discussion Starter · #9 ·
Dipstick looked fine, only oil. No visible leaks or signs of fluid. Overflow was empty.

i let the car sit overnight then started it to move it for the tow truck, it started with the temp too high message and the gage was pinned all the way to high as soon as it started.
 

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Discussion Starter · #11 ·
So i heard from the dealership,
it IS the head gasket they ARE recommending i do the engine. And i DO feel like i am being a bit raped in the deal.
according to them, 6700 to do the head gasket with 18 hours labor or 9700 to do the engine. They said the do not know if the block is cracked or damaged and suggest the engine replacement.

i looked on line and saw the cost of a mustang head gasket replace was around 2-3000 am i wrong?
i have no idea how they pulled 6700$ up, does that sound crazy high to you? It might be a moot point since they have not said one way or another if there is engine damage.

i just asked for a detailed quote to be emailed to me. If 6700$ seems crazy high i might just call another ford dealer and or a local mechanic.
i am not planning to spend 10000 plus on a car thats maybe worth? 18? 20? And with less than 36000 miles on it and needing a new engine, i am not loving ford right now.

i had read that an engine replacement could cost upwards of 10k sound about right?
but 6700 for the head gasket repair? Is that super inflated? In an attempt to push me towards an engine replacement? I am so disappointed right now…. My favorite car and not even 36000 miles on it….:(
 

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That is a lot of money! My guess would of been $3500 for the repair!?
You may want to call an Ecoboost Specialist like Jessie Ringley at EMS (engineered motorsport solutions) and see what he would charge to drop one of his built motors into your car.
 
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So i heard from the dealership,
it IS the head gasket they ARE recommending i do the engine. And i DO feel like i am being a bit raped in the deal.
according to them, 6700 to do the head gasket with 18 hours labor or 9700 to do the engine. They said the do not know if the block is cracked or damaged and suggest the engine replacement.

i looked on line and saw the cost of a mustang head gasket replace was around 2-3000 am i wrong?
i have no idea how they pulled 6700$ up, does that sound crazy high to you? It might be a moot point since they have not said one way or another if there is engine damage.

i just asked for a detailed quote to be emailed to me. If 6700$ seems crazy high i might just call another ford dealer and or a local mechanic.
i am not planning to spend 10000 plus on a car thats maybe worth? 18? 20? And with less than 36000 miles on it and needing a new engine, i am not loving ford right now.

i had read that an engine replacement could cost upwards of 10k sound about right?
but 6700 for the head gasket repair? Is that super inflated? In an attempt to push me towards an engine replacement? I am so disappointed right now…. My favorite car and not even 36000 miles on it….:(
I had mine replaced by a local shop for roughly $3k parts and labor without having to get the cylinder head resurfaced as there was no warping. If you have to get it resurfaced I would add on another $500. Honestly surprised the dealership you took it to even offered to do the head gasket. Every post I see about a blown head gasket usually has the dealership going with a full engine replacement instead.
 

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Terrible.

Lots of ecoboost rental mustangs at the recyclers check car-part.com or local classifieds for wrecks being parted out for a long block.

Lesson learned....drive with check engine light on at high risk.

Ford sells new shortblocks for $500 or the Ecobeast block thats good for 500 HP for $6,900 (maybe dealer will discount)

Maybe a Focus RS motor would be a good doner.

A quick Google search shows SP63 Stage 1 Built Long Block For Ford Mustang Ecoboost Rated 500hp+

For the $7K the dealer wants you should be able to do far better or cheaper. Of course there is the time cost as well.
 

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Discussion Starter · #15 ·
I had mine replaced by a local shop for roughly $3k parts and labor without having to get the cylinder head resurfaced as there was no warping. If you have to get it resurfaced I would add on another $500. Honestly surprised the dealership you took it to even offered to do the head gasket. Every post I see about a blown head gasket usually has the dealership going with a full engine replacement instead.

Correction after getting the written quote, the quote for 6700$ was for gasket replacement plus cylinder head replacement, the other quote for 9700 was for the full engine replacement.

so at least the 6700$ was not a super inflated quote for just the gasket replacement.
Still crazy expensive, im not sure what im going to do… still disappointed a car with so few miles needs such an expensive repair.
 

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Sorry to hear about your situation. If it were my car I would be looking for a complete used 2.3 engine from a wrecked car. I've seen used engines for 1500.00-2500.00.
 

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Looks like they are charging $3000 for a new OEM head!??
That's about the same money, that a performance head cost with racing cams...!?
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Correction after getting the written quote, the quote for 6700$ was for gasket replacement plus cylinder head replacement, the other quote for 9700 was for the full engine replacement.

so at least the 6700$ was not a super inflated quote for just the gasket replacement.
Still crazy expensive, im not sure what im going to do… still disappointed a car with so few miles needs such an expensive repair.
Still way too high. It was $1500 for labor and another $1300 for parts for my head gasket replacement as it included other seals, gaskets, sensors, etc. that needed to be replaced as part of the work. A new cylinder head assembly from Ford is only $572 and there really shouldn't be much more in additional labor since they have to remove the head anyways to get to the gasket. I would say that $4000-$4500 would be a more reasonable estimate.
 

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Your saying buy the engine and have it shipped to maine and get a local guy to install it? Cheaper than the dealer still….
Doubt if a built motor will be less money, than an oem motor from the dealership... But if I didn't do my own work, and was going all out... I'd probably ship the car to the engine builder!?
It really depends on your goals for your Mustang.
 
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