It has been a while and I have two W124, M104 HFM Wagons with issues so here we go:

1995 E320T w/ASR (250k) - wiring harness replaced

Symptoms:
1. When cold car will not accelerate under load until throttle pedal is lifted, then takes off like normal. This only lasts a few minutes until the car has warmed up, then it runs like normal until...
2. Hard acceleration under load (high speed up hill passing), car accelerates then "hits a wall" with flat throttle response and bucking/surging.

Codes:
Module: 5 (EGR)
8- 1 (No Fault)
14- 5 (Stop Lamp Switch), 6 (Starter Lock Out Switch)

Thoughts:
The plugs look OK but I am tempted to give it new wires and connectors as a first go at it.

Car 2, 1994 E320T w/o ASR (220k) - wiring harness replaced

Symptoms:
1. This car had the horribly cracked wiring harness leading to the idle speed/cruise throttle control. I rewired it myself and everything was OK for a 6 months.
2. Car runs normally but CE light is on.

Codes:
Module- 26 (Upshift Delay)
8- 1 (No Fault)
14- 2 (Cruise Control), 5 (Stop Lamp Switch)

Thoughts:
Ugh, could be anything?

Any guidance would be super helpful. Thanks in advance!

~Kyle

__________________
Kyle Fitzpatrick
Materials Engineer

1969 300SEL 6.3
1992 300E
1994 E320 Touring