2002 E430 - Occasional miss at idle...no codes? - PeachParts Mercedes-Benz Forum

skiier3_9 · #1 02-21-2010, 11:25 AM

Where would I connect the ohm meter to measure that resistance?

jcyuhn · #2 02-22-2010, 04:18 PM

You would be removing the plug wires and measuring them end-to-end.

Your car is at just the right age & miles for the plug wires to be getting a touch flaky. About 7 years is how long the M112/M113 wires seem to last. Idle quality degrades first, though it takes a while to throw a code.

I had the same symptoms on my 2001 E320 - an occasional, single stumble at idle. The problem was somewhat correlated with wet/humid conditions.

Replacing the plug wires eliminated the occasional stumble.

- JimY

PETERPNYC · #3 02-24-2010, 07:49 PM

Quote:

Originally Posted by jcyuhn

You would be removing the plug wires and measuring them end-to-end.

Your car is at just the right age & miles for the plug wires to be getting a touch flaky. About 7 years is how long the M112/M113 wires seem to last. Idle quality degrades first, though it takes a while to throw a code.

I had the same symptoms on my 2001 E320 - an occasional, single stumble at idle. The problem was somewhat correlated with wet/humid conditions.

Replacing the plug wires eliminated the occasional stumble.

- JimY

I have a stumble under load that one mechanic said is plug wires and another said is fuel injectors . How do I differentiate between the two?
Car is a 93 400 SEL