Q: Service Engine light flashing, rough at idle, loss of acceleration, but smooth over 40mph. PCV Valve or hose?

asked by on

Service Engine light is flashing. Very rough idle and acceleration, but smooth over 40 mph. Unusual smell as well. Pontiac manual says emission system problem. PCV Valve or PCV hose problem?

Hi Douglas. Thanks for contacting us today. It’s is quite possible that the root source of this issue is a PCV valve or other vacuum leak. Knowing the OBD-II trouble code that is triggering the warning light would be a good way to isolate the damaged components, but an on-site inspection to diagnose this issue is probably a good idea.

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. Service Engine light flashing, rough at idle, loss of acceleration, but smooth over 40mph. PCV Valve or hose?

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: Service Engine Soon light staying on.

Evaporative systems seal the tank off from atmosphere and purge through the intake while the engine is running, if the computer senses that one of the valves electrical or mechanical functions aren't appropriate it will set a check engine light...

Q: Doesn't rev past 4k revs

You may have a mass airflow sensor that is contaminated or not working correctly. The sensor can get contaminated by dirt, debris, and oil from aftermarket oil-type air filers. You can try and clean the sensor and use a standard...

Q: when a front tire goes flat can the impact damage the steering gear

A flat tire would not create that type of damage to the steering gear. The previous noise that you had could have been related to steering gear. That has car has a steering rack assembly (gear). Unfortunately, I would need...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.