Skip the auto shop - Our mechanics make house calls

Q: My car shakes while it idles but says there is an evap system leak?

asked by on

For about three weeks now my car has been shimmering while it idles. The check engine light is on and I had it read, it said that it was an evap system leak. Recently I've had the canister purge valve replaced but that did nothing. I've also checked the gas cap and that to seems fine, but do an evap system leak and rough idling go hand in hand? Are they two separate issues? And does that indicate where the leak could be since the engine is shimmering?

My car has 130000 miles.
My car has a manual transmission.

A: An evap leak is the same thing as a vacuum ...

An evap leak is the same thing as a vacuum leak. A vacuum leak will certainly cause the engine to run roughly. I would recommend having your vacuum levels checked with a vacuum gauge by a qualified professional to determine whether they are in specification. If the vacuum levels are low, I would then recommend getting a smoke test performed on your vehicle. This test will insert smoke into the engine through the brake booster hose and the smoke will be emitted from where ever the vacuum leak is. Once the leak is found, have it repaired as soon as possible in order to resolve the rough idling issue. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs.

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・Save up to 30%

Get a quote

What others are asking

Q: 2004 Chevy Express makes noise while idling

The first thing you'd want to check is the power steering. A lot of times, they groan on those. If it's not the power steering, a lot of times it would be the transmission. If it's coming from the transmission,...

Q: 1998 - 2001 Ford Mustang Windshield Compatible?

Although it is still considered the same generation the '98 Mustang is different than the '99 and newer. It is unlikely that the windshield for the '99 through 04 Mustang will fit your '98 Mustang. Although they are considered the...

Q: Car is not starting

Hi. In a no start situation, there are always a few items that would need to be looked at. The first thing that is generally done is to read out any trouble codes in the engine computer. If codes are...

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...
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...
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...