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Old 01-17-2017, 06:24 PM
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Throttle Valve Switch Adjustment

I have an 87 560SL with high idle. With some very helpful articles, I have determined that the throttle valve switch is bad. I have downloaded directions on how to replace the switch and feel I can do it but I'm not quite sure how you adjust it once you attach it to the throttle valve. Could someone please explain this to a newbie?
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Old 01-17-2017, 09:46 PM
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One contact closes when the throttle is closed and opens as the throttle opens. The other contact closes at WOT.
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Old 01-18-2017, 08:09 AM
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Do you have any more detail on how to check and adjust it with an ohmmeter?
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Old 01-18-2017, 10:18 AM
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Let's back up.....HOW did you determine that the switch is the culprit?

Before getting carried away, check the usual suspects - vacuum leaks and idle air control. The latter is a very common issue for high idle, when the control board fails or the solenoid sticks, it sticks open and causes an idle 1200-1500 RPM.
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Old 01-18-2017, 09:30 PM
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I used the guys at JustAnswer and also did some online searches. No vacuum leaks and idle control valve is good. We connected a jumper from middle pin to outside pin and the idle went down to normal RPM's. He told me that this meant the switch is bad. I purchased the switch and feel like I can get everything removed to get to it but I just want to make sure it's in there correctly before I put everything back on. I understand I need to put an ohmmeter on the center pin and one outside pin and turn the switch til it reads closed. Just not sure of the details. I wish there was a YouTube video! I'm sure it's simple but im a little confused by the instructions in the manual. I'm a visual person.
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Old 01-19-2017, 05:13 PM
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From the FSM:
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Throttle Valve Switch Adjustment-scanm116-7-throttle-sw.-adj..jpg  
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Old 01-20-2017, 07:45 AM
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Thank you Frank! This seems a little more detailed than the pages I printed off. Greatly appreciated.
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