johnfin1

So I am getting P0300 (random misfire)and P0332 (knock sensor) but the car runs smooth and strong. Anyone else have this issue?

strutaeng

What vehicle and engine?

You probably have an intermittent misfire and haven't noticed it. You need to hookup a scanner that has misfire counts to see what cylinde(s) are missing.

Same thing with the knock sensor code. I think that one will cause the ECU to pull timing a bit or something if it detects knocking. There's a way to check the knock sensors with dvom and striking the engine block with a large screwdriver and hammer. I found a video and it to my truck a while back. Either knock sensors and/or wiring harness are usually the problem.

ghardester

johnfin1, you have previous posts about the same issue of random misfires. One mentions the misfire being on cylinder #4, did you change the plugs, the coil, and check out the fuel injector on #4? Because most of these kind of misfire codes will lead you back to: New plugs, new wires, and changing or moving the coil to try to determine if it is faulty. Your knock sensor code is likely a result of the computer trying of compensate for not running on all cylinders all the time.

johnfin1

Yea, it was #3 but now it just general. Car runs and performs perfect. I have an actron CP9580 which does a ton of checks, dynamic too, but I dont see any feature for individual firing check. Is there a cheap scan tool that can do that? What about a strobe light?

johnfin1

Iam convinced tge problem is poor or contaminated fuel. Cleared codes and when i punched the gas pedal it pinged and i got the knock sensor code.