Just today my '00 300M started running rough. Most noticable at idle
- like a cylinder not firing.
Engine light came on.
After parking it for a while, and starting it, it idles rough, but no engine light. Engine light only comes on if I drive it a little.
Codes displayed on odometer are P1684 and P0302.
The 1684 is a battery disconnect code (it has the original battery, which hasn't been disconnected for years - if ever, so perhaps this is an indication of a weak battery - although it turns the engine over just fine when cold). The 1684 code is said to not be responsible for the check-engine light.
The P0302 code (if I'm right) indicates misfire in cylinder 2. This website:
Might this set of conditions represent just a bad plug then? (orginal plugs).
Car is exactly 8 years old tommorrow - bought it new back on Nov 1,
1999.Comments?
Answers?
Recommendations for aftermarket plug brand (I might as well start there) ?
Have never taken off a coil pack before - any special tools, or is it self-evident?
Which one is cylinder 2?