Skip the auto shop - Our mechanics make house calls

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?

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: I cannot use my keys to lock or unlock my doors or trunk on my S-type 2003 Jaguar

Hi there. If you press the unlock button on your Jaguar key and can hear a click sound coming from the door or the or the trunk, then the issue is with the car unlock module. However, if you press...

Q: Water pump leaking

I suggest having the water pump leak resolved first. The engine relies on the water pump to circulate coolant through it. Without proper circulation, the engine will overheat, which could cause irreversible engine damage. The Check Engine Light is...

Q: My mechanic says I need a throttle body with a vacuum hose for my 04 mercury mountaineer. I've found throttle bodies but none of them mention a vacuum hose.

Hi there. The best thing would be to check the throttle body that is currently on the engine. If the throttle body has vacuum hoses to it, then you would need to get a throttle body with a vacuum hose....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...