Our 124 Wagon (1994, E320, no traction control) has an ongoing idle issue.

The original harness was replaced, new plugs wires and coils. New fuel injectors. Tried 3 different MAFs. Same issue, which is…

…Idles fine when cold. When it’s fully warmed (80c), the idle stumbles. Drops from 650 ish, to about 400, if I recall correctly. Then it’s fine again for 4-5 seconds, then repeats.

That’s the whole story. Oh, a bit more - no check engine light, no codes, two mechanics have tried and failed.

Thanks,

Joey

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Thanks,

Joey

'88 560SL Pearl Black/Java 152K
'94 E320 Anthracite/Grey 89K


Previously:
'94 E420 Black/Bamboo
'90 300E
'71 280SEL 4.5