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#1
10-17-2010, 10:51 AM
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throttle "sticking?" 93 400E
Had 3 unnerving surprises the past 2 days, when I give it maybe half or more throttle from a standing start, as in jumping out at a right-on-red. I let off the pedal and it keeps going - have to nail the brakes, at which time it does go back to normal. New symptom, ETA was replaced 3 years and 25k ago. Ideas?
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL 
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#3
10-17-2010, 02:21 PM
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Will, I presume the accelerator has mechanical linkage. Lubricate all joints with automatic transmission fluid. Typically the linkage is neglected and never lubricated even though it is a routine maintenance item.
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Fred Hoelzle
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#4
10-17-2010, 02:49 PM
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I haven't looked it over, but obviously I know it to be an "electronic" throttle..........of course, the pedal has to be connected to some kind of cable I suppose (!) so I'll check that first.
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#5
10-18-2010, 12:41 AM
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Will, although I'm unfamiliar with the V8 engines I know that the accelerator on our 1995 E320 with the I6 engine has mechanical linkage that needs lubrication. So I would expect that vintage V8 automobile to have the same design. You also may want to check how smoothly the gas pedal linkage (above the pedal where it penetrates the firewall) operates, and lubricate it.
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Fred Hoelzle
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#7
10-18-2010, 10:58 AM
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Its fly by wire. Electrical signal makes the motor in the throttle open so if its sticking it may be the cables or linkages sticking for the electrical reading but may be the actuator itself. Remember engine bay harnesses are prone heat and cracking and can "short" causing all types of issues and if the ETA you bought was a shelf model then the inside of it may have been on the shelf a long time and the wires inside of it will fail just like the harness being of the inferior material.
I have a 93 400E and have replaced the upper harness, I plan on redoing the lower harness on my own when i get a chance and will take my ETA out at the same time and put liquid insullation on the wires to hold them apart and insulated. People usually completly rewire the unit but I used the idea with the oil sending unit and after 4 years its been good to go so I am gonna try. I cant make it any worse.
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