WOOW!! Big knocking on E420

[hudsongua]

Hi everyone,

I am new to this forum although I have found some very good help through it for my 95' E420 in the past. Anyway's if someone could help shed some light on a DM code 25 that recently came up I would appreciate it. This happened recently, and this is how it occurred: I headed out for work and about 5 minutes into my drive I got to a stoplight and floored it on Green. The car reached 5K r.p.m. and hesitated to shift and it felt as if it were redlining for some reason, I tapped the pedal once, it shifted, I hit 65 then came to a stop at the next light. At that point the car began to knock like a champion, I thought the engine was going to shut down. I kept driving slow after that and eventually the knocking leveled out until it disappeared.

When I got to work I turned the engine of, turned it back on again, it started right up running normal, that was when the CEL came on. I checked it and it gave me Code #25, the KS..

Does anyone have some info. as to why this may have been triggered? What caused the car to lag that first time when I floored it and if any other malfunctions could trigger a code 25?

The car runs fine right now, but any time I want to floor it it does a repeat of what happened that first time at the Green light.

Any help greatly appreciated.

Thanks in advance.

DH