w208 acceleration problem
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Joined: Aug 2008
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2001 clk55 amg
w208 acceleration problem
ok i posted a while back about the problem and a few people suggested a maf and throttle position sensor . looking at things i dont think that is the problem.....under the gas pedal when the pedal is pushed to the floor it will hit some kind of button mounted into the floor. when that button is pressed is when i go into limp mode. Im thinking its maybe some sort of electronic trans kick down switch or something?
any help will be GREATLY APPRECIATED as soon as possible.
any help will be GREATLY APPRECIATED as soon as possible.
MBWorld Fanatic!
Joined: Jan 2007
Posts: 1,152
Likes: 29
From: Sydney, Australia
190D 2.5 (x2), 190E 2.6, W202 C240,W202 C43 (C55), W210 E55, W212 E250CDI
The switch under the throttle is the transmission kickdown switch.
When you are driving the fuel mixtures are based on both long term (what has been learnt previously) and short term trims(what the o2 sensors are seeing currently). both are approx +/- 25% of std mapping
When you hit the kickdown switch the fuel mixtures are only long term trim, whatever it has learnt is all it can do. If the AMM/MAF has failed then the amount that the ECU can increase the fuel mixtures is greatly limited when the kickdown is used.
If you don't know when your fuel filter was last changed or if has been more than 2 yrs then change it, a blocked fuel filter can cause good low end power but poor topend.
Have you tried disconnceting the AMM/MAF and seeing if it's any better?
When you are driving the fuel mixtures are based on both long term (what has been learnt previously) and short term trims(what the o2 sensors are seeing currently). both are approx +/- 25% of std mapping
When you hit the kickdown switch the fuel mixtures are only long term trim, whatever it has learnt is all it can do. If the AMM/MAF has failed then the amount that the ECU can increase the fuel mixtures is greatly limited when the kickdown is used.
If you don't know when your fuel filter was last changed or if has been more than 2 yrs then change it, a blocked fuel filter can cause good low end power but poor topend.
Have you tried disconnceting the AMM/MAF and seeing if it's any better?
