Q: Car idling up and down
The car is idling up and down.
Recommended Services
| Car idle is rough Inspection | $94.99 - $114.99 | Get a Quote |
This is a common issue. My first instinct would be to look for a vacuum leak. Air going into the engine is metered so that the ECM knows how much fuel to add for a correct mixture. If you have a vacuum leak or unmetered air, both the mixture will be off, and the engine’s idle can race as it does with most vacuum leaks. The ECM will attempt to control this sometimes, which makes it erratic. Vacuum leaks can also happen in multiple places. I suggest seeking help from a qualified mechanic to verify this rough idle diagnosis.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
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
What others are asking
Car shuts down randomly while driving
Yes, from what you describe it would appear that the ABS module may be having an issue. The flashing light indicates that a problem has occurred, and that the ABS system is disabled. The vehicle should still brake and stop...
Just replaced faulty starter and one week later it won't work again
If you got a used starter then that starter may have the same problem that your original starter had. This is common with used parts. I would make sure you are getting power to the main big terminal to the...
Issue with firing - 1991 Volvo 240
Misfires can occur from fuel supply, spark, and camshaft timing problems. You have replaced most of the ignition components that supply spark to your cylinders, but you could still need spark plug wires. They may look good and not be....
My driver side tire makes a clicking sound like a baseball card in a bike tire. It does not happen driving over 50 mph
Hi. This sounds like the you have a bad wheel bearing (https://www.yourmechanic.com/services/wheel-bearings-replacement) on your passenger side front wheel. Sometimes bad wheel bearings will only make noise at low speeds. This is usually the case when the wheel bearing is first...
Engine sputtering and manual gear-shifter is getting stiff.
Hi there. It's possible that the shifting issue could be related to the clutch, but that seems more like a gear linkage issue. The engine vibration is most likely not related; and could be caused by a damaged vacuum line...
Smell of petrol and white smoke from exhaust Peugeot 207 Sport
Hi there - I think there are perhaps 2 problems here. the excess fuel, white smoke (https://www.yourmechanic.com/question/why-is-white-smoke-coming-from-exhaust-by-d-trigg) issue is not likely caused by a cam phaser problem. This seems more like a rich fuel mixture issue - leaking injector(s), or...
Cummins exhaust brake staying on
Check the DPF filter and see if it's plugged up. A plugged DPF filter will cause the engine exhaust brake to stay on, and the engine light will come on if the filter fully plugged up. If you need further...
Would performing a heater core bypass give my AC colder air in my 2001 Jeep Wrangler
Hello. Unfortunately this will not help. If the blend doors under the dash are working fine then the heater core should be completely blocked out when the a/c is on. If the system is functioning properly and the system pressures...
Can my 2003 non-turbo 2.4 L engine be swapped into my 2004 turbo PT Cruiser?
Anything is possible, but it's not a straightforward swap. The powertrain control module (PCM) is different as is the wiring. I'm sure there are other subtle differences as well. You could use the 2003 as donor car and pull everything...
Related articles
A Buyer’s Guide to the 2012 Chevrolet Volt
Whether Whether you’re concerned about the environment or just want a vehicle that allows you to use less gas, the 2012 Chevrolet Volt might be just right for you. Designed to run entirely via an electric current, this electric hybrid...
The Best Used Cars to Buy If Safety is #1
Maybe Maybe you’re a parent buying the first car for your teenager, or perhaps you’re a new parent and the safety of your little one is of the utmost importance. Or perhaps you're a safety-minded individual looking to make a...
Symptoms of a Bad or Failing Air Injection Hose
Check your car's air injection hose for signs of damage. If there are idling issues or the Check Engine Light turns on, you may have to replace it.
Browse other content
Maintenance
Services
Cities