Acceleration Problem

[StephenK]

Have a problem with my 01 S500 today. When I press the gas peddle nothing happens for a few seconds then the car will go, I can press the pedal to the floor and nothing, but once it starts going it is fine. If I keep pressure on the gas peddle it accelerates no problem, but it I take all pressure off the pedal, when I press it again, it takes a few seconds before the car wants to go. Strange one to me, the car is not actiing like it is going to stall, just a delay in acceleration. Any ideas?

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[whoover]

Sounds like the accelerator pedal module is going. Very common problem with this car at about that age. Do a search. The part is $200 and is easy to replace yourself.

When it goes the transmission and engine control units get contradictory information about pedal position. You wind up starting in fifth gear. If that's what it feels like you're experiencing, try replacing that part first. If it's not the problem, you've just saved yourself another failure in the future.

[NazarKmet]

Hi how are you. I have a same problem, Is any body know how to replace the accelerator pedal module. Thank you.

[whoover]

Originally Posted by NazarKmet

Hi how are you. I have a same problem, Is any body know how to replace the accelerator pedal module. Thank you.

Mine was done on warranty so I don't have first-hand knowledge, but I think there's a single nut holding the accelerator module to the firewall. The nut is under a cap. You swap the electrical connector and are done.

[NazarKmet]

Where the module located? Under the hood or in trunk? Sorry I don't know. Thank you.

[whoover]

Originally Posted by NazarKmet

Where the module located? Under the hood or in trunk? Sorry I don't know. Thank you.

It's the pedal assembly itself. The thing you step on. Your foot operates an electronic module that runs the drive-by-wire.

You replace it in the driver's footwell.

http://www.detali.ru/cat/oem_mb2.asp...SGR=015&SGN=01

[NazarKmet]

Thank you. I went to the dealer around me they ask $400 for it the parts it self is $178.80 Parts number 220-380-00-07 on ebay you can get for $90.

[Paul Wall]

Originally Posted by StephenK

Have a problem with my 01 S500 today. When I press the gas peddle nothing happens for a few seconds then the car will go, I can press the pedal to the floor and nothing, but once it starts going it is fine. If I keep pressure on the gas peddle it accelerates no problem, but it I take all pressure off the pedal, when I press it again, it takes a few seconds before the car wants to go.

Strange one to me, the car is not actiing like it is going to stall, just a delay in acceleration.

Any ideas?

I had a similar problem with my S430 and it turned out to be a short in the gas peddle (its electronic rather than a direct connection). Good Luck. Paul

[StephenK]

Is it just a matter of changing the pedal assembly? or does the car need to be used up to the computer???

[whoover]

Originally Posted by StephenK

Is it just a matter of changing the pedal assembly? or does the car need to be used up to the computer???

Just plug and go.

[JRAMGV8]

I wasn't aware of this.. good info.

[StephenK]

Getting the part, and will be able to give you my personal experience with it a little later today. Hope it works!!!!!!

[StephenK]

Got the part:



Simply take a plastic cap off, then undo the bolt, disconnect two connectors, old assembly comes out. Simple reinstall

Takes all of about 10-15 minutes.

[whoover]

Glad it worked for you.

[Oddemann]

Hello

If this didnt solve your problem, you should start looking at your O2 sensors.

Rgds
Odd

[2H S5]

Originally Posted by whoover

Sounds like the accelerator pedal module is going. Very common problem with this car at about that age. Do a search. The part is $200 and is easy to replace yourself.

When it goes the transmission and engine control units get contradictory information about pedal position. You wind up starting in fifth gear. If that's what it feels like you're experiencing, try replacing that part first. If it's not the problem, you've just saved yourself another failure in the future.

Thanks to you whoover, my same problem was solved and was going to do a DIY for the members. Seems like Stephenk beat me to it

BTW, part # is: 220 300 00 04 as seen on the box (not 220-380-00-07)

Dealer told me it couldn't be the accelerator pedal and was adamant about the transmission

Another independent shop told me it could be the actuator ( a $600 part)

I bought it at a local mercedes shop for $150 with tax and replaced it in 15 minutes also.

Thanks again whoover

[whoover]

That's great. I'm glad it worked out.

[sdixon]

Thanks for the info. I have a s430 and I had the same problem. My ODBII reader was giving me an error code of "p0120" but I could not figure what sensor that was or where it is located. I will now go and look for this part. Has anyone else also had the same error code and changed this sensor out? Thanks again. Everyone has been helpful.

[StephenK]

Originally Posted by sdixon

Thanks for the info. I have a s430 and I had the same problem. My ODBII reader was giving me an error code of "p0120" but I could not figure what sensor that was or where it is located. I will now go and look for this part. Has anyone else also had the same error code and changed this sensor out? Thanks again. Everyone has been helpful.

What is this ODBII reader??????

Also I came across this site never ordered anything, but you may want to check it out.

http://www.oempartsdirect.com/

[newton22]

Originally Posted by StephenK

What is this ODBII reader??????

Also I came across this site never ordered anything, but you may want to check it out.

http://www.oempartsdirect.com/

http://en.wikipedia.org/wiki/On-Board_Diagnostics

Relevant to all cars manufactured around after 1996.

[whoover]

Originally Posted by sdixon

Thanks for the info. I have a s430 and I had the same problem. My ODBII reader was giving me an error code of "p0120" but I could not figure what sensor that was or where it is located. I will now go and look for this part. Has anyone else also had the same error code and changed this sensor out? Thanks again. Everyone has been helpful.

Yep, the P012x codes are throttle position. It would be the most logical code to be thrown when the accelerator module packs up. But I've heard that, depending on exactly how it fails, it can throw a host of odd codes, including false transmission codes. This is because the TCU and ECU get conflicting input as to engine speed.

Like I said earlier, just drop in a new pedal module. If it isn't the problem you can be confident it will be some day soon. But it's usually the problem.

[sdixon]

Thanks. I really appreciate your help and I am shopping for the part as we speak. Have a good one.

[awdrock]

Great info everyone.

My 01' S500 does the same thing from idle to acceleration.

Another thing I noticed is that when im driving if I floor it, its a slug, the motor feels like it has no power because it feels as its in the wrong gear, even upon pressing the "button" on the bottom of the pedal position. Happens at any speed.

Could this also be related to the same pedal module???

[whoover]

Sounds like it. I'd just replace it. It's about a 5-minute DIY and in the rare event it isn't your problem you've avoided a future on.

[ibeforreal]

A similar problem to what I have on occasion. Sometime when I punch it, the transmission doesn't fully engage. Only happened twice. However, I cut the car off, restart it and everything works fine. The only problem is when I'm on the interstate pulling over to restart the car is not pleasant and kind of embarassing. Thanks for the info.