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Occasional blue smoke & oil smell

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#1
New to the forums, but have had my fiesta for almost 2 years now, recently a friend has told me he noticed blue smoke coming from my exhaust when decelerating, and I can smell a burnt oil smell when stopping fairly often. This has all started fairly recently, but the turbo makes no abnormal noise, holds boost fine and car still has the same power it did. I'm FBO (minus an intercooler) w/catless dp. The only thing that changed since I noticed the smell was switching to Royal Purple instead of the usual Mobil 1 but I doubt that would cause an issue? Any ideas for where I should look?

Also- car has 34k miles, & it's a 2014
Turbosmart BOV, oil changed every 3-4k, has required no major maintenance since I've had it
 


Hypergram

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#2
New to the forums, but have had my fiesta for almost 2 years now, recently a friend has told me he noticed blue smoke coming from my exhaust when decelerating, and I can smell a burnt oil smell when stopping fairly often. This has all started fairly recently, but the turbo makes no abnormal noise, holds boost fine and car still has the same power it did. I'm FBO (minus an intercooler) w/catless dp. The only thing that changed since I noticed the smell was switching to Royal Purple instead of the usual Mobil 1 but I doubt that would cause an issue? Any ideas for where I should look?
Having colored smoke in your exhaust means that something is combusting in your cylinders that is not supposed to be. That is usually either oil or coolant. Oil is usually blueish, coolant is usually white. When it comes to looking for something I really don't know. Could be a head gasket like in the early Focus RS? Good luck with it though.
 


OP
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Thread Starter #3
Could be a head gasket like in the early Focus RS? Good luck with it though.
I thought of that too, I will compression test the car as soon as I get a chance. I dont think it's this though, the car has no issues cooling & the oil is not milky but wont hurt to check.
 


Hypergram

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#4
I thought of that too, I will compression test the car as soon as I get a chance. I dont think it's this though, the car has no issues cooling & the oil is not milky but wont hurt to check.
Yeah of course! My knowledge on what it could be stops there, so feel free to update this thread once you get a result!
 


TyphoonFiST

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#5
The best way to diagnose a head gasket is to test the coolant for carbon dioxide in the coolant....most local parts stores carry the tester and the die. Put die in the tester....get coolant and dye to mix....see if it changes colors. Just because the oil isn't Milky doesn't mean the head gasket isn't bad. . Good luck!

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Dpro

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#6
The best way to diagnose a head gasket is to test the coolant for carbon monoxide in the coolant....most local parts stores carry the tester and the die. Put die in the tester....get coolant and dye to mix....see if it changes colors. Just because the oil isn't Milky doesn't mean the head gasket isn't bad. . Good luck!

Sent from my SM-N950U1 using Tapatalk
This is true headgaskets can blow into the coolant chambers or lines and the engine will run just fine it will just puff smoke.

Usually though a car putting out blue smoke is burning oil and white smoke is coolant burning off because its a water based situation.
 


OP
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Thread Starter #7
Usually though a car putting out blue smoke is burning oil and white smoke is coolant burning off because its a water based situation.
Right, this is why I'm kind of shying away from the headgasket being the issue. I will still test it just for peace of mind but I feel the this is not my issue. What are the chances that the turbo could be leaking oil internally, even though it holds boost fine? Really hoping that if there is an issue, it is this so I can just upgrade the turbo a bit earlier than expected lol
 


Dpro

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#8
Right, this is why I'm kind of shying away from the headgasket being the issue. I will still test it just for peace of mind but I feel the this is not my issue. What are the chances that the turbo could be leaking oil internally, even though it holds boost fine? Really hoping that if there is an issue, it is this so I can just upgrade the turbo a bit earlier than expected lol
hard to say not there in person.
 


XR650R

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#9
Was your car recalled? Some FiSTs had a coolant issue. There was a recall "fix" that doesn't fix it.
It was something with the cylinder head developing a hot spot that warped things a bit after you shut it down.
The head was changed sometime in '15. '16 and later are more reliable, which is to be expected with any new model. They always have to iron out some bugs.

The FoRS problem turned out to be the wrong gasket on some cars. The Mustang 2.3 has a different head gasket than the FoRS. Some ended up in the FoRS, due to some oversight. Fried the engines, and put a big black mark on the car. Cost Ford a fortune, too.

If your FiST has the old head, it may be the problem. Just like the FoRS with the wrong gasket.
 


OP
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Thread Starter #10
Was your car recalled? Some FiSTs had a coolant issue.

If your FiST has the old head, it may be the problem. Just like the FoRS with the wrong gasket.
Yeah my car had a recall, but I never had it fulfilled, haven't had time. However, my car has never overheated even on hot days with A/C or at AutoX. The recall says low coolant flow can cause engine to overheat and crack head (causing a pressurized oil leak). They provide details on how to check your coolant and the recall adds a level sensor, but mine has never overheated and doesnt use excessive coolant, my head should be fine right?
 


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#11
I got the same problem i got a oil catch can, it reduce the smoking on engine breaking but its still there, i ordered the check valve to see if that helps will notify if it fixes it.


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PunkST

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#12
Dont use royal purple. Its junk and not rated for a direct injection turbocharged car.
Go back to either mobil 1 full synthetic, or go to castrol edge for gdi turbo engines. RP gets too hot and thin, then leaks past seals.
 


akiraproject24

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#16
Sorry to open up an old forum, but I too am having the same thing but ONLY when I switched to royal purple. I’m wondering if it’s an oil thing. Next time I do a change I will use a different oil and determine from there.
I never really thought about this when I decided to run Amsoil Signature.
Is this ok to run in the FiST?
 


M-Sport fan

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#17
I never really thought about this when I decided to run Amsoil Signature.
Is this ok to run in the FiST?
That is a super-premium, very low volatility oil, and is now specifically formulated to combat LSPI, and intake valve deposits, in turbo D.I. engines, even if it does not officially carry the Ford spec.

You are fine.
Maybe just consider their 5W-30 instead of their 5W-20 for summer OCI (Oil Change Interval) use. [wink]
 


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#18
Blue smoke on deceleration usually means oil getting past the valve seals/guides.
This used to so common on Small Block Chevies you could use it to identify which cars had a stick with which had an automatic. Used to LOVE running against the automatics because those trannies sucked up between 50 and 70 hp.
 


XR650R

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#19
This used to so common on Small Block Chevies you could use it to identify which cars had a stick with which had an automatic. Used to LOVE running against the automatics because those trannies sucked up between 50 and 70 hp.
Yup. In those days, the 4 speeds were just quicker. No torque eaten up by that 3 speed slush box.
Now, it's a different story.
I'm not a manual purist, but I'm glad they put this tranny in this car. It does the job.
 




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