2000 SLK230K - acceleration lag - Mercedes Benz SLK Forum

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#1 Old 07-26-2014
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2000 SLK230K - acceleration lag

Hi

I have just joined this forum and just recently bought a 2000 SLK 230K.

I am still learning about the vehicle, but have noticed that when you put your foot down ( to the floor) when in 1st gear and sometimes when in 2nd gear, the car seems to lag/hesitate and you have to release the throttle and press more gently to pick up speed

This does not happen when in the later gears. The car is automatic.

Does anyone have any ideas what this might be?

Thanks in advance

Regards

Dan
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Last edited by danvan; 07-26-2014 at 09:27 AM. Reason: typo
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#2 Old 07-26-2014
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Dan, going to move your question to the new members introduce yourself section to save you a step, ok?

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#3 Old 07-26-2014
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Thanks Jeff

will take a look through other posts, but if anyone has an answer to my question, please let me know

Thanks
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#4 Old 07-26-2014
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Hmmm... Wait till some other experts jump in.
My 1st thought would be the MAF sensor. I'd try cleaning it first and see if it makes any changes.
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#5 Old 07-26-2014
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What? Jayson I thought you were an expert!!!

Well this 'expert' (i stayed at a holiday inn express once), says

Techron!!!

https://www.slkworld.com/general-disc...esitation.html
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#6 Old 07-26-2014
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A warm welcome from Southern Arizona. Good to have you on board. I'm not familiar with the R170, however, my understanding of the the S and C mode on the R171 is that when in the C mode the vehicle starts off in 2nd gear and has lower shift points. More throttle causes it to downshift into 1st giving you more giddy up and go. Enjoy the people, the forum, and top down cruisin'.

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#7 Old 07-26-2014
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Quote:
Originally Posted by jbanks15 View Post
What? Jayson I thought you were an expert!!!

Well this 'expert' (i stayed at a holiday inn express once), says

Techron!!!

https://www.slkworld.com/general-disc...esitation.html
I hadn't come up with this problem so I don't know the exact answer.
But how could I forget about Techron?! Definitely add a bottle in your tank!
In my assumption it can be lack of air in the system, I'd check all the vacuum lines - condition/leaks, etc.
And btw, do you drive in W or S mode???
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#8 Old 07-26-2014
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#9 Old 07-26-2014
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Hi, welcome from the North of Scotland. Congratulations on your recently purchased SLK.


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A quick easy first check. Check the air connections to the supercharger. After I DIY'd my Air Filter I failed to secure the connections and there were air leaks. The supercharger failed to deliver extra power.
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#12 Old 07-26-2014
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#16 Old 07-27-2014
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Welcome aboard,
There is a toggle switch to the left of the gearshift, it should be in "S" summer mode not "W" winter mode.
How well does it accelerate when you have it in "D" & put your foot down?


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#17 Old 07-28-2014
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Hi from London too,

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#18 Old 07-28-2014
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Hi to all!

Leapyfish, when i put my foot down in 'D' that is where the lag/stutter happens. When I press the accelerator down, rather than flooring it quickly, but flooring it slowly (if that makes sense) it seems fine

I have contacted a mechanic, who without seeing the car thinks it might be the airmass sensor
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#19 Old 08-01-2014
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Thought I would give an update

Wednesday evening I went through the 'accelerator reset' procedure I found on the forum. This is where you turn the key 2 positions, put accelerator to floor for 30 seconds, remove key, release throttle and then start. From what I read this is supposed to reset something which stores driving habits.

The problem though still persisted around the 4k rev mark, so after speaking to a mechanic who thought it sounded like the MAF sensor, he was going to come out today to look.

However, today when driving to work the problem seems to have disappeared! Several times when driving slowly, I floored the accelerator to test and on each occasion the car behaved correctly going past 4k revs until it naturally changed. It also behaved at normal cruising speed and then accelerating hard (past 4k revs)

Could this reset I did have worked or will I likely still have the problem again?
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#20 Old 08-01-2014
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you will need to occasionally do the reset. I do it whenever I feel it needs to be 'rejuvenated'!
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