Q: My car starts to misfire really rough after running it for about 30-60 minutes, shutting it off then starting it up

asked by on November 06, 2016

have gotten 8 codes. 1 says something about being lean on bank 1, other code says random misfire detected and 6 codes are each cylinder that have misfired. This only happens after running the car for a good length of time and shutting it off then starting it back up soon after
plugs are new, just changed oil, and timing belt has recently been replaced. My car has 170000 miles.
My car has an automatic transmission.

Car idle is rough Inspection $94.99 - $114.99 Get a Quote

You have taken some great steps to try and resolve these issues. Looking to the spark system was a good choice. Plugs were a good start, but the distributor and wires may be causing the plugs to not receive the signal they need at the right time or voltage. You will want to check the spark at each plug, which can be done with a spark tester.

If this system is fine, you will want to look into the fuel pump and filter. Both of these can cause misfires if the fuel is not reaching the cylinders. Acuras built around this year have reported similar symptoms that have been cause by the primary O2 sensor failure. This would be the O2 sensor that is between the engine and the catalytic converter. Unfortunately, this is going to a process of elimination.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

When Should I Have the Fuel System Inspected?
There are many parts to a fuel system but only a few that actually can be inspected visually or otherwise on most vehicles. There are several things you can do to keep your fuel system running smoothly. Try to get...
Car starting, but turning off
You may be having an issue with the antitheft system not enabling the fuel system or possibly your fuel pump may be having an issue. Take a look at the antitheft light on the dashboard, when the problem is happening...
Brake noise
Try and drive it for a couple weeks after inspecting to make sure everything was installed correctly. The noise may change after the pads are seated into the rotors. When a pad and rotor are new, they will not match...
Commercial vehicle died while running. no power to panel and no clicking. replaced battery with no changes.
The procedures to diagnose a vehicle that is a no crank or no power condition would always start with the battery being tested (https://www.yourmechanic.com/article/how-to-check-a-car-battery). Make sure the battery is fully charged. Next, check each and every fuse in the fuse...
Car won't start - 2013 Dodge Charger
Hi there. Fuel pressure would be a good thing to check out as lack of fuel pressure would indicate a failed fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement). Other things that may cause the vehicle to stall are a camshaft (https://www.yourmechanic.com/services/camshaft-position-sensor-replacement) or crankshaft position...
Front light goes on and off
Hi and thanks for contacting YourMechanic. This is a normal condition for the lights to flash when setting the locks. This is an indicator to the driver that the locks have engaged and the security system is now active. If...
Helicopter noise coming from drivers side tire
Hi there. This sounds like it could a serious issue with the potential to be a safety related issue. There's no true way to tell whether driving the car in its current condition is safe or not. However, I would...
Noise with steering wheel
Hello, thank you for writing in. There are several reasons your vehicle may make noises related to steering. The first thing to consider is that the steering, suspension, and brakes are all heavily related. Often you feel issues with the...
Third Generation Dodge Ram 3500 dually problem years.
Hi there. To be quite honest, I've never experienced any issues with the manual transmission third generation Dodge Ram 3500 Dually. The problems I have seen are typical with automatic transmission powered 3500's and have more to do with torque...

Related articles

A Buyer’s Guide to the 2013 Acura ILX Hybrid
Acura Acura returns from a spate of years devoted to the higher-end luxury market, and they do so in style with a car that practically invents its own segment. The ILX Hybrid is the half electric portion of the brand...
Symptoms of a Bad or Failing Valve Cover Gasket
Common signs of a faulty gasket include a burning oil smell, dirty valve cover, oil leaks, low engine oil, and a rough-running engine that misfires.
How to Get Acura Dealership Certified
Acura car dealerships offer automotive technician jobs to mechanics who are Acura certified through the PACT program.