Tom,

always wondered what's magic about 2.4K for the "Reference Resistor" (R16/2). Here's what it says about a 119.xxx engine.

Fuel ------- Resistance Trim ---- Resistance ----- Ign angle correction
Prem 95---- 015 545 67 28 -------- 2.4K ------------- 0
Reg 91----- 015 545 71 28 -------- 220 ------------- -3

Theres also a 015 545 68 28 that's 1.3K ohms for -3 deg and 015 545 70 28 that's 470 ohms for -4 deg correction.

Also 015 545 69 28 that's 750 ohms for -6 deg correction.

All of the above was according the MB engine manual but the values vs Ign correction don't seem to make sense.

Also says: "If NO resistance trimming is used, the ign timing is retared at FULL LOAD by 3 deg".

But these numbers check with what you said. I'm going to remove my 2.4K and see what happens.

__________________
Regards . . . . JimF
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'94 S500 Cpe

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