Q: PCV valve or hose failure?

asked by on

I have oil built up in my intake system and filter. I read where it said it may be the pcv valve but the valve rattles and seems OK. The hose coming from that valve to the top of my intake manifold is bent and seems to be almost pinched shut. Is there a way I can fix this to where it will stay open? Do you have any suggestions or tips I could try? I get poor mpg, sometimes when I start the van it will idle low and sometimes bog up and down and then die. Sometimes it'll bog up and down and then go to just a little under 1000 rpm. I can feel it lose alot of lower going up a hill or when gaining speed.
My car has an automatic transmission.

Hello. The PCV valve regulates the flow of crankcase fumes to the engine to be burned when there is greater pressure in the crankcase than there is in the engine intake - which is most of the time. If the engine has worn piston rings, there is more combustion gases (also known as "blow by") and pressure in the crankcase, so more oil fumes are vented to the engine, gunking up the throttle body, idle air control valve, mass air flow sensor, etc.

This is somewhat normal over the life of the engine, but also indicates an engine wear condition. Perhaps the hose you mention is a generic hose bent from a straight piece, and instead should be a molded hose that is pre-bent to the correct shape, and has good flow? Check that out. I would recommend having a rough idle inspection completed by a mobile, professional mechanic, such as one from YourMechanic. They will be able to come to your location, diagnose this problem, give you an accurate assessment of damage and cost for repairs.

Was this answer helpful?
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. PCV valve or hose failure?

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: There's no milky residue on my oil cap or my dipstick but there's oil in my radiator I know I have a bad spark plug wire.

Hi there. A bad spark plug wire would not allow engine oil into the cooling system. The possibility of a bad head gasket, could allow engine oil into the cooling system. Assuming the engine has not been overheated, electrolysis could...

Q: Shakes flutters stalls won't start

There is another component to the ignition system. The crankshaft position sensor sends out a speed and position signal the computer uses to calculate when to send spark. If you have a code reader that shows live data on the...

Q: I have power steering hoses that needs to be replaced. What is the labor to do it?

Hi and thanks for contacting YourMechanic. First, you will need to put a drain pan under the hoses. Remove one end of the hoses and drain out the fluid. Remove the other end of the hose and take them off....

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.