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.

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?
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. My car shakes while it idles but says there is an evap system 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: Rough idle and car dies - 2007 Chevrolet Impala

Hey there. This is a common sign of a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve...

Q: Car bucks, jerks, and idles rough - 1991 Ford Mustang

Hey there. This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold and monitors the air intake as it is mixed with fuel prior to...

Q: Amount of A/C refrigerant required for my Hyundai Santa fe 2002 GLS

It should have a sticker under the hood stating the amount of R134a to be 1.35lbs or .6kg. You should put about 1 oz of A/C oil in the condenser and the compressor should have the amount it needs on...

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...
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...