When you get a chance, Larry, I'd appreciate it if you research you MB data and verify whether or not the '88 103 has a detonation sensor. Also, where is it physically located on the engine?

An automatic transmission will probably have less tendency to detonate being as how it is tough to load it at low revs due to converter slippage. I have only heard brief transient detonation on my car if I short shift and give it high throttle as I described above. I've never heard sustained detonation on 87 PON.

Thanks!

Duke