Q: Car will start but will not idle good

asked by on

Replace spark plugs oxygen sensor into was thinking of replacing the ignition coils also the throttle position switch by the way where is the throttle position switch located for this vehicle

My car has 80000 miles.
My car has an automatic transmission.

Hello. An idling issue can be caused by many different parts on your car. I would need to know if this occurred before you replaced all of these parts or if it occurred right after. If it was after then the work needs to be checked and the parts need to be checked to make sure that the correct plugs were used.

If this was occurring before the parts were replaced, then I would start by checking the throttle body. If it is dirty, then this will occur. If it is dirty I would clean it out fully and then retest it. If the problem persists then it can be a throttle position sensor or just about any of about a dozen other sensors. As that time I would install a scan tool and see if there are any codes and monitor all of the sensors to see if there are any that are not reading correctly. If those are also fine, then the compression needs to be checked as this can also be caused by a valve timing problem. If you are planning on having this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the idling problem and advise on repair.

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. Car will start but will not idle good

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: Car chirping while idling

Hi there. A chirping sound could indicate an idler pulley is about to fail. The bearing in the pulley will start to break down and need replacing. Although it could be a different pulley going bad, I would recommend having...

Q: My 02 lesabre has a sulfur egg smell what is it it's making me sick

The engine should be checked first to make sure it is not running too rich. If not running rich then the exhaust catalyst (catalytic converters) are bad and need to be replaced.

Q: Stuck throttle when driving. 1997 Ford Ranger

Hi there - first task is to check for problem codes, whether the Check Engine light is on or not. Most auto parts stores will do this for you for free on a "time-available" basis. Check to see if the...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...