MTV10

For the past month or so, intermittently been getting slight misfires at random. Happens when I first start the car and for 5-10 seconds after I drive off. Once every 10 starts. Checked for codes... nothing.

Today, slightly rough idle after starting the car. Felt the car misfiring, then it started misfiring pretty bad - Flashing CEL and whatnot. Stopped the car... restarted it. Still misfiring, read the codes and cleared them and the car slowly started idling normally after a few minutes.

Drove off without issue....


Below are the codes the car threw. Misfires in 3 cylinders. Plugs were changed 2 months ago. Could it be coilpacks?

SuperFastYo

best way to find out is to move the coilpack to a cylinder that hasnt misfired. If it misfires in that cylinder then its a coilpack

Jasonoff

I would put money on an air leak, or potentially primary O2.

Very rare for a coil pack to work intermittently, even more rare (very very very rare maybe?) for multiple coil packs to work intermittently.

w204nyc

Plus 1. Just had this happen and it was o2 sensor

faz492

had this issue recently fixed, coils. try what SuperFastYo said.

MTV10

Guys, I'm leaning towards primary O2. The fact that it is intermittent like that and the P2540 code lead me to believe it's O2 related. Also I highly doubt that multiple coilpacks will go bad all at once.

skratch77

make sure plugs are torqued right.they can get loose in there also

jptaylor

the 1st thing you need to do is ACTUALLY have your codes read....what you posted is the most generic OBD display possible....that is what you get from your general purpose scan tool and really tells you nothing more than you have an issue, which you already knew to begin with!!!!

either have a dealer scan it or grab a bluetooth ELM327 obd dongle and the pro version of Carly on apple or android and let the car tell you EXACTLY what is wrong with it...you will be amazed at the detailed diagnosis your car's ecm is capable of providing you

PJmak

I had this happen on my car which is a m113 motor. It was a fuel issue.

Car was showing over one qt but it had actually ran out of fuel.(bad sensor)

Make sure you check if you are getting fuel to the motor too I guess