Q: Q: Idle issue

asked by on

Hey just had a quick question I have a 2002 Honda civic automatic 1.7L and so I had a question earlier regarding that when I turn it on it would kind of rumble so I seen a hairline crack in the exhaust manifold which i got patches up pretty nice but then it still was the same so I let the car idle and pulled out each ignition coil one by one and there's 4 altogether and so I pulled 3/4 and the Rpm went down as.it should right? And then one of them when I pulled out it didn't.make a difference in the Rpm so then I switched two ignition coil and the problem stayed in the same cylinder could that mean I have a bad spark plug that needs to be replaced?

My car has 290000 miles.
My car has an automatic transmission.

Cylinder misfiring can be caused by: Ignition coil, spark plug, fuel injector, or a wiring issue to the coil or injector. By moving the coil from the misfiring cylinder to another and the misfire staying with the original cylinder, you have basically eliminated the ignition coil. You can try the same thing with the spark plug before buying new ones. If again the misfire stays with the same cylinder, then you have a faulty injector or signal/wiring issue to that coil or injector. Also, mechanical damage with that cylinder such as a damaged valve or valve seat can also cause a misfire. If you need further assistance with your misfiring issue, a certified technician from YourMechanic would be pleased to come out and help you figure out what is going on.

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. Q: Idle issue

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 turns over, but won't run - 2004 Honda Civic

The whining noise near the belt area along with the crank no start and sputtering is a pretty good sign the timing belt has suffered a failure. It is very common for the failure to occur at start up. The...

Q: Engine rpm not steady at 40-55 mph

This is a common sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of a vehicle. The sensor is usually located on the butterfly spindle/shaft so that it...

Q: Can't keep antifreeze in car

If your vehicle is losing coolant (antifreeze) you probably have a leak. I recommend having a trained technician, like one from YourMechanic, pressure test your cooling system to locate where the coolant is leaking from. From there, they will be...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.