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.

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 1,000 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
  1. Home
  2. Questions
  3. Blue smoke from exhaust when coming off boost focus ST 2.5

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: My car doesn't start, have to hit dashboard and get jump for car to start

I would start with testing your battery and alternator with a multi meter. Good batteries hold a charge of 12.6 volts or higher. If the battery is low, try to jump start it. If this starts your vehicle, test your...

Q: Heavy transmission leak.

The transmission needs to be inspected to determine the source of the leak. If the leak source is not obviously identified, Nissan has a TSB out NTB09-140 which discusses the proper diagnosis using a UV dye to locate hard to...

Q: my 04 vw beetle makes a whirring noise in 1st gear and while revving in park. Could it be the secondary air pump?

The best way to determine an exact cause of a noise as to have your vehicle inspected by a qualified professional. Consider YourMechanic as this can be done from your home or office.

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.