1972 Mercedes Benz 280SE 4.5 Throttle Position Switch Check Bosch D-Jetronic

You will see how to evaluate the Throttle Position Switch (TPS) in a 1972 Mercedes Benz 280SE 4.5 (W108) with Bosch D-Jetronic Fuel Injection. If you don't hear 20 distinct clicks, then you take the cover off and clean the contacts. You don't have to take it off the engine to do this. However, if you do take it off, mark the adjusting bolt's position before you take it out. Also, to adjust if needed, place a 0.4mm feeler gauge under the stop, rotate the switch fully one-way until the multimeter reads zero ohms. Then turn slightly the opposite direction until the meter reads infinity. Clamp right there. Since mine was fine this information was beyond the purpose of the video. The purpose of the video is to demonstrate how to evaluate if the TPS is functioning properly. If it was not, that would be another video. Thanks for watching and commenting. Video done on May 9, 2022.

[@BackMarkerStudios]

Well, I learned something new today. Twenty clicks. Thanks!

[@kensshowtell]

My pleaser. It is a good day when something new is learned.

[@yamahayien78]

Thanks a lot from France 👍

[@kensshowtell]

My pleasure, thank you for watching. I sold my 1959 Alfa Romeo Giulietta Spyder Normale to a gentleman in France.

[@michaelsliwinski8044]

Thanks for sharing

[@kensshowtell]

My pleasure. thanks for watching.

[@austinado16]

I think the Throttle Position Switch would also be tested with an ohm meter, to make sure it had no dead spots. The D-Jet systems are know to have failing fuel pressure regulators, especially at their current age. Thanks for the video and nice job on the camera work to show it up close!

[@kensshowtell]

Thank you.

[@alhamedi66]

Thank you for sharing your experience with us. I checked my 1973 450slc 4.5, but no click sound totally with switch on.
Engine starting but when acclirator it's chocking 🥵

[@kensshowtell]

Thank you for watching and commenting. The TPS (throttle position switch) can be cleaned. Check your linkage adjustment first.

[@alhamedi66]

Thank you for your quick reply and interest and patience.
Can you tell me click sound from where come.
The click sound must be when Tps attached with throttle rod or can be available when remove Tps.
If click sound not available. What this and how can be repair.
Where I can get workshop service manual pdf online please.
Waiting your reply ASAP.
Best regards,

[@kensshowtell]

The click sounds comes from inside the TPS. I've sent you a PDF using this email A1autoservices@alhamedi66@@alhamedi66

[@alhamedi66]

@@kensshowtell Thank you Ken's.

[@kensshowtell]

The clicking sound comes from inside the TPS. I think you may find this link helpful. jetronic.org/en/d-jetronic/72-troubleshooting#Kaltstartventil@@alhamedi66

[@joshuaculley9695]

I also have basically the same engine. The 74 450SL. Would my throttle position switch do the same?

[@kensshowtell]

Thank you for watching. Yes, as your car has the D-Jetronic.

[@joshuaculley9695]

Alright. What if there are no clicks that I can hear.

[@hamedcontacts8107]

Hello and thank you for the video..
Can TPS be calibrated manually?
or it has to be with ohmmeter..what are the steps?

[@kensshowtell]

And I thank you for watching. You have to use an Ohm meter. I have a PDF about on this topic concerning the TPS from R107 SL cars with the M11t 4.5-liter engine. I can send it to you.