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Discussion Starter · #1 ·
Hey FoST drivers!

I bought my "previously enjoyed" 2014 ST3 in mid February and immediately had a leaky turbo which was thankfully replaced under warranty. I had also been experiencing a rare event in which the vehicle would not start after pressing the START/STOP button (yes, the clutch and brake were fully depressed). After trying 1 or 2 times, the car would finally start, but a bunch of white smoke would come out of the exhaust.

The guys at the dealership said it was probably the low battery in my key fob and when I pressed the button, it would prime the car to start, so when it finally did start, it was just burning a bunch of extra gas. I replaced the battery in the key fob and this issue has happened maybe twice or three times since then.

Does anyone have any idea what this is? From what I've read, white smoke is an indicator of coolant leaking into the combustion mixture (They checked coolant system pressure and said it was perfect). Could this be a cracked head?

Any input is greatly apreciated!
 

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Hey FoST drivers!

I bought my "previously enjoyed" 2014 ST3 in mid February and immediately had a leaky turbo which was thankfully replaced under warranty. I had also been experiencing a rare event in which the vehicle would not start after pressing the START/STOP button (yes, the clutch and brake were fully depressed). After trying 1 or 2 times, the car would finally start, but a bunch of white smoke would come out of the exhaust.

The guys at the dealership said it was probably the low battery in my key fob and when I pressed the button, it would prime the car to start, so when it finally did start, it was just burning a bunch of extra gas. I replaced the battery in the key fob and this issue has happened maybe twice or three times since then.

Does anyone have any idea what this is? From what I've read, white smoke is an indicator of coolant leaking into the combustion mixture (They checked coolant system pressure and said it was perfect). Could this be a cracked head?

Any input is greatly apreciated!
Check your coolant and oil to see if one is mixing with the other.

Sent from another garage.
 

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Discussion Starter · #5 ·
Should be able to just look into it. Oil will float.

Sent from another garage.
So I couldn't find any oil floating in the coolant reservoir. I also checked the dip stick and oil fill cap for a "milk chocolaty" coloured substance that some coworkers said is an indicator of mixed oil and coolant, but there was nothing.

One thing however is there looks to be some dirt build up or something in the coolant reservoir. Could this be related? Even if it isn't, should this be something to worry about?

Coolant Tank.JPG
 

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There could possibly a head gasket leak causing a coolant leak between the combustion chamber, and the coolant jackets for the head to the block.
Less likely but possible a crack in one of the exhaust ports on the head near a coolant passage.
Lastly could be the turbo (we have a water/oil cooled turbo).


A leak down test would reveal any issue with the head gasket
pressurizing the coolant system would reveal anything leaking from there.
 
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