Hello.

The car is 93' 300E 2.8 California version with 83,000 miles. I'm the second owner.

I've had pretty bad engine misfire since yesterday, so I checked the code.

Here below are the codes I got:

Onboard LED: None
Pin 8 : 23
Pin 14: 11

Then I checked the ignition coils because I suspected them. Fortunately, I was right. #1 ignition coil seemed bad.

Here are the resistance values:

#1 Primary 0.7 Ohm, Secondary 0.575 MOhm (not K)
#2 Primary 0.7 Ohm, Secondary 6.8 KOhm
#3 Primary 0.7 Ohm, Secondary 6.8 KOhm

Now, I have a question. The OBD module told me #2 ignition coil was wrong, but I got a different result.

Can anybody explain?

Do a recount ..
Or...clear codes and move coil and wait for DM to pick up the known bad coils position.
You may have a wire harness problem.

__________________
A Dalton

I moved the problematic coil to different position then the DM picked the coil correctly.

Replaced the coil with a new one then the problem was gone.

I found the coil was not completely gone but it varied its secondary resistence along with the temperature. The coil was original with a blue sticker on it.

The good news is this fix fixed the other problem I posted years ago. The post # is 160385 (Where does this strange noise come from?).

Thanks Arthur.

Prove of the capabilities of the OBD fault detection system...

Very good.

PS... for 104 waste spark owners, it is always those blue stickered coils to watch for..

__________________
A Dalton