Q: Bad idle with no check engine light on

asked by on

I was moving my sister's stuff after she passed away, and all of a sudden my van had a rough idle. I have changed the plugs, wires, fuel injectors, fuel filter and cap and rotor, and I still have a rough idle. I was told to use this stuff called Restore, you add it to your oil, I did but if I go too far with it it stalls out, but starts right back up with No problem. Do you think it could be the ignition coil? Please let me know Lorraine

My car has 177000 miles.
My car has an automatic transmission.

Greetings, I’m sorry to hear about your sister. A rough idle may be caused by many different things such as low fuel pressure, low voltage to the fuel injectors, dirty fuel injectors, a vacuum leak, a faulty Oxygen sensor or a dirty or failing idle air control valve. Any of these possibilities relate to fuel delivery issues that will disrupt the normally balanced air/fuel mixture that would otherwise allow the motor to run smoothly. It sounds like in your case you have touched on all of the ignition related components. Try checking some of the above items that can impact the fuel delivery to see if this doesn’t solve your idling issue. I would recommend having an expert from YourMechanic cometo your location to diagnose your rough idle problem.

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. Bad idle with no check engine light on

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 dies when I apply brake and turn wheel at the same time

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Q: Truck idling high

Hi there. You may need to have the carburetor adjusted or you have a binding throttle high idle choke linkage. A major vacuum leak can be something that can lead to having a high idling vehicle. A primary cause for...

Q: Grinding sounds when driving over a speed bump

Hey there, thanks for writing in about your 2000 Plymouth Voyager. There is a technical service bulletin to check the sway bar links connected to the front struts. The joints start to bind and can cause squeaks, grunts, and groans...

Related articles

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...
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.