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2001 S Class Motor Issue

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Old Dec 21, 2012 | 09:43 PM
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2001 S Class Motor Issue
I have a 2001 S500. I have had the car for 6 years with no major issues. It has 140k miles on it. Today driving on the highway the motor went into overdrive going from 30 mph to 70 mph with RPM at 5k. I tried to press the brakes with no result. I had to manually shift it from D to N after which the transmission went from 4th grear to 1st grear but motor kept running at RPM of 5k...after i pulled over and stried to restart the motor it starts with RPM going to 5k. wonder what could be causing that. any suggestions.
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Old Dec 22, 2012 | 07:01 AM
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Originally Posted by hirs123
I have a 2001 S500. I have had the car for 6 years with no major issues. It has 140k miles on it. Today driving on the highway the motor went into overdrive going from 30 mph to 70 mph with RPM at 5k. I tried to press the brakes with no result. I had to manually shift it from D to N after which the transmission went from 4th grear to 1st grear but motor kept running at RPM of 5k...after i pulled over and stried to restart the motor it starts with RPM going to 5k. wonder what could be causing that. any suggestions.
Sound like you have an accelerator issue. The gas pedal is a known problem for this car. Good luck
Johan
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Old Dec 22, 2012 | 12:43 PM
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2002 S430
Most likely the accelerator module is going... It means the accelerator pedal assembly itself should be changed. OEM part is between $100-200 and DIY in 20 minutes.
Search the forum, write w220 accelerator in the Search and read a thread started by StephenK.
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Old Dec 22, 2012 | 02:27 PM
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Thanks for the message. But now when I start it it stays at high RPM and the motor starts jerking right away....fault in accelerator module can do that...
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Old Dec 23, 2012 | 01:52 AM
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Bad accelerator pedal is very common on this car
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Old Dec 23, 2012 | 04:35 AM
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Thanks again for a prompt reply tusabes....If its not the bad accelerator do you think it can be the fuel pump relay with the rev limiter....
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Old Dec 23, 2012 | 08:59 PM
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Fpr would not cause the car to rev at high rpm
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Old Dec 24, 2012 | 12:57 AM
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Thanks tusaes....i am going to change the pedal and see if that works.
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Old Dec 26, 2012 | 03:20 PM
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should I check the TPS sensor as well....do you think that can cause the motor to stay at high RPM......
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Old Dec 26, 2012 | 03:23 PM
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should i get the TPS sensor looked at as well....you think that can cause the motor to stay at high RPM...
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