Hello,

In case anyone may be interested, I am posting the following status.

Recently I replaced the timing belt. My 1991 240 was pinging when I step on the accelerator hard and was sluggish at 60MPH on freeway. The many comments that I received from the Brickboard were that my timing belt may be misaligned. So I was hopeful that this would fix.

Well the symptom stayed the same. No change. My mechanic was somewhat apologetic and told me to add fuel injector cleaners. I did and performance is somewhat better but still pinging on sudden acceleration and sluggish at 60 MPH.

I can drive this car fine most of the time. So I really do not have complaints. (I am now wondering if ECU has to be precisely matched to the car. I checked this by changing ECU with my other '91 240 that I have. That car drives awesome with ECU from this car.)

By the way, my temperature gauge on display was always low, just FYI. My car has been driving OK so I assume that the temperature display is broken and not temperature control.

Thanks!