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.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Fuel pump not working

Hello there. I suggest having the pressure checked with a fuel pressure tool. That will help you know for sure if the pump is or isn't at fault. If you need further assistance, I recommend you have a mechanic, like...

Q: I have oil and water mixing in the engin but there is no oil in on the plugs.

No. There is only 1 common possibility for this engine to get water into the oil, and that is a blown head gasket. This often, but not always, follows an overheating event, and some times also occurs with vehicle mileage...

Q: Steering sticks a little when I turn to the right

Hello. This can be caused by a few things. Most of the time it is caused by a joint that is dry and needs lubricating. If one of the steering joints or ball joints are seizing then this will occur....

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...
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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...