Skip the auto shop - Our mechanics make house calls

Q: Does not idle

asked by on

It starts but the idle is low can't get it to idle properly what am I doing wrong
My car has an automatic transmission.

Hello. Low idling issues can be caused by several faults. Typically they are an effect of poor fuel and spark efficiency. When diagnosing this type of issue, you will want to start with the easiest parts to check, and work your way down the list of possibilities. You will want to start with check for proper spark. You can do this by checking the conditions of your spark plugs. When was the last time you changed them? Plugs can be changed daily and it would only improve your engine performance. The spark plug wires should also be checked for good conduction. You can test the voltage coming to the spark plugs with a spark tester. You can then check the fuel pressure by hooking up a gauge inline. This will test the lines, pump, and filter. If the pressure comes back low, you will want to change the fuel filter, and possibly the pump if the filter doesn’t solve your issues. Unfortunately, you have to proceed with the process of elimination until you find the component at fault.

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

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: I put a new water pump and new thermostat and its still running hot. now the serpentine belt had broken off. what's wrong with car

Hi there. What you're describing sounds like you may have a serpentine belt, pulley, or another belt driven component that has failed. The water pump is driven by the serpentine belt and cannot circulate the engine coolant if the belt...

Q: How much will it cost to have a mechanic fix it?

Billing question was sent to CS for the cost of replacing the crankshaft position sensor on a 2001 GM Sierra 2500 HD with a V8-8.1 engine.

Q: Car revs up and won't rev down. Changed ICV

High idle problems are often times related to vacuum leaks or lean fuel conditions. I would start by checking for vacuum leaks and other fuel delivery components, such as the mass air flow sensor, injectors, throttle body, etc. High idle...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...