Skip the auto shop - Our mechanics make house calls

Q: Blue smoke from exhaust when coming off boost focus ST 2.5

asked by on

Hi my car a ford focus st 2.5 leaves some blue smoke and sometimes backfires when shifting gears when on full boost. First thought that it could be a boost leak as intercooler leaked according to a dealer. Intercoolet replaced and still have the same problem. Could this be turbo seals thst is on the way out?
My car has a manual transmission.

A: You should disconnect the hose on the turbo...

You should disconnect the hose on the turbo to see if you see indications that the turbo has oil in the intake. The oil seals in the turbo may start leaking and will cause the smoke you are seeing. If you see oil on the turbo vanes and inside intake tubing then lift up and down on the turbo shaft to see if bearing play is felt. If oil leaks or bearing issues you will need to have the turbo rebuilt.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Wire came off of starter

Hi, if this is a large diameter wire like a battery cable then it may be the cable to the starter terminal. If it is a smaller wire, it may be a memory wire for the engine controls and things...

Q: Huge oil leak for NO reason?

There are quite a few oil seals on an engine that could leak. If the front crankshaft seal tore or was pushed out that could create a large sudden leak. That seal is not difficult to replace though. It's possible...

Q: car will not crank and ECM.fuse keep blowing and no reverse lights will bad neutral safety switch cause this?

It sounds like you have an electrical issue. Check the DTC connector to make sure you are getting power and ground. A short to ground could be the cause of this concern. It may be possible that the reverse safety...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.