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 sputters and runs rough upon acceleration. 1995 BMW 318i

Hello. Thanks for writing in about your 1995 BMW 318i. This problem is usually caused by worn out spark plugs and spark plug wires. When the spark plugs are worn out they don’t fire as well during acceleration. If the...

Q: Dies out at start, squealing/whistling sound, battery light comes on when it dies and wont stay running unless hold my foot the on gas.

A motor needs more fuel to run cold than it does after it warms up. There are number of conditions that can exist that will create this problem. First I will address a few things you mentioned in your question....

Q: I can put my clutch in and put the car in gear and car won't die?

The first issue sounds like you have throttle problem. You may want to take off the intake and see if your throttle body is moving freely. It could be dirty and need to be cleaned. Check the cable that is...

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...