Skip the auto shop - Our mechanics make house calls

Q: rpm below 1 when idle

asked by on

I noticed that when i am stopped at a red light my car's rpm is in the middle of .5 and 1. I have had my spark plugs changed, and oxygen sensor changed as well. (After getting those items fixed my check engine light went off.) If i am not pressing on the gas pedal hard my car will jerk at 18-20 mph. Is this normal?

My car has 197000 miles.
My car has an automatic transmission.

A: Hi there: What you're describing is no...

Hi there:

What you're describing is not a normal situation. Although changing the spark plugs and O2 sensor tend to fix this type of issue, it could also be caused by dirty fuel filter, clogged fuel injector lines, or another electrical gremlin. It also may be the idle control system that is faulty. The best thing to do is have a local ASE certified technician, such as one from YourMechanic, complete a computer diagnostic test which will display an error code and point them in the right direction to fix the problem you're experiencing.

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・Save up to 30%

Get a quote

What others are asking

Q: Stuck in second gear

The vehicle speed sensor may be malfunctioning and causing the transmission not to shift. The computer will need to have the codes retrieved. I recommend that you have a mechanic, such as one from YourMechanic, come and test the vehicle...

Q: Tilted wheel

From your description of the damage, it may be best to have the vehicle towed to a body shop. An impact that is hard enough to break a wheel and bend suspension components may have also bent the chassis/uni-body structure...

Q: Steering wheel shakes when braking

Hi there. If the steering wheel shakes when hitting the brakes, then you are right, it does have warped rotors. If the rotors on this large of a vehicle are that warped then the rotors should be replaced to keep...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.