Skip the auto shop - Our mechanics make house calls

Q: Puff blue smoke on startup

asked by on

i need help locating the pcv valve on my truck. i think i need to replace it. i get a puff of blue smoke on startup.

My car has 350000 miles.
My car has an automatic transmission.

A: Your engine does not have a PCV valve. The ...

Your engine does not have a PCV valve. The engine is equipped with crankcase vent tubes that do not need replaced or cleaned unless line is broken. You may have valve seals that are leaking oil into the exhaust valve outlet and when you start the engine it's sending the oil smoke out of the tail pipe. The valve guides and valve seals need to be checked. Not much to can be done unless cylinder heads are removed. I'd suggest shaving a certified technician, like one from YourMechanic, diagnose the smoke firsthand for an accurate repair.

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・Save up to 30%

Get a quote

What others are asking

Q: Regarding electronic brake control module

Check the brake light bulbs, sockets and grounds first - they endure the most harsh conditions, and are easiest to check. Given the "intermittent" condition you mention, the brake light switch itself, and the brake light relay are next on...

Q: Tugging while shifting from first to third gear, the engine lacks power

Hi there. The most common cause of this is a bad catalytic converter. When it fails, it will clog internally and will restrict the exhaust. This will cause a serious lack of power like what you are experiencing. It can...

Q: Why is my oil gage stuck at 80 psi whenever my truck is on?

This is a common sign of a failing oil pressure sensor. This is a small unit in the engine block that reads oil pressure inside the motor and relays this information to the vehicle's computer as well as the oil...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.