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#1
11-25-2006, 05:44 PM
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Electronic Throttle Actuator
I am puzzled and curious as to how the Electronic throttle works. I hope someone can shed some light on this for me. I have a 1993 300E 2.8 104 HFM motor with an ETA and no ASR. I have a throttle cable that appears to operate the butterfly opening on the ETA. How does the ETA set the throttle opening if the mechanical link is operating the throttle plate? Thanks for any insight. I would really like to understand the ETA better.
Bill  
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87 560 SL 93 300E 2.8 91 300CE-24 
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#2
11-25-2006, 08:55 PM
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There is a sensor which determines the amount the throttle pedal has been depressed. The throttle actuator moves the throttle plate open a corresponding amount using an electric motor. The cable is a backup which will open the throttle plate just a bit, in what's called "limp home mode". I'd hate to have to limp very far, you'll press like hell and get maybe 20-25mph out of it. It was mainly thought of as a means to say "get the car over the railroad tracks" if the actuator fails, I don't think it was ever "really" designed to be driven on that cable.
Gilly
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Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#3
11-26-2006, 06:05 AM
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jimF
http://pages.prodigy.net/jforgione/MB_EA.html Yes another ASR problem; '94 S500 Hope this help.
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#4
11-26-2006, 10:55 PM
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Thanks for the responses.
Bill
__________________
87 560 SL 93 300E 2.8 91 300CE-24
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