Q: Q: Vacuum leak

asked by on

I was told my car has a vacuum leak, which is causing misfires, a noise under the hood, and a Check Engine light. Then, they said the intake manifold O rings need to be replaced.

Hi. This is a very common failure on vehicles like yours. So common, in fact, that there is a technical service bulletin (TSB) on it. The TSB is XT303-13 and it addressed the hissing sound from under the hood, as well as illuminated Check Engine Light with codes P0171 and P0174 stored. These codes indicate a lean condition, which is often the result of a vacuum leak. According to the TSB, the course for repair is to replace the o-ring on the intake manifold tuning valve (IMTV). The TSB says the o-ring is available separately, so there is no need to replace the entire valve.

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. Q: Vacuum leak

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: Cannot get engine light or DSC reading to go off 2002 Jaguar X-type

Hi - there must still be a problem code which is eluding them, perhaps something Jaguar-specific. The Dynamic Stability Control (DSC) warning light may be simply a dirty or failed wheel speed sensor. I would recommend a Check Engine light...

Q: Speed sensor keeps going bad and Check Engine Light is on.

This may potentially be related to a faulty transmission control module. As you may know, every time a gear change is required, the car's computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the...

Q: Stalling and misfiring at idle on a 1999 BMW Z3

Those things are notorious for getting vacuum leaks on them because the tops of the engines are all made out of plastic--including the intake system. Especially on the driver's side, there are all kinds of plastic piping. You'd want to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...