Hi all. I have a benz which I replaced the head gasket on, but now i have idle issue. So i replaced: knock sensors (the wiring was stripped), MAF, IAT, fixed up the wiring hardness, checked the timing, plugged up purge solenoid valve since its stuck open (improved idle a bit), and now Im aiming at the ETA (Electronic Throttle Actuator).

Here is the problem:



the S1 (red box) has to have a short (zero ohms) when throttle closed, but when the switch opens it has to have infinite ohms (testing on 2k ohm scale). Which it did. So, S2 (green box) works the same way as S1 does, but when I was testing it I dint have the results that i was hopping for, I only got 1443 ohms either closed or fully open throttle.

So what do you guys think? I found a company that can rebuild my current throttle body for around 300 bux.

Btw, I bought a throttle body from ebay and the guy supposedly had it tested before it was removed from the car... but it turned out to be almost same value as i got from my own (~1200 ohms) but on S1, not on S2...

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1987 Mercedes Benz 300D Turbo Black/Black