w140

amg500

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hi my fathers w140 s500 has a problem....if you pump the pedal quickly it cuts out or runs lumpy does anyone have any idears please.
 

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Ouch,and not easily to answer. does the ASR lamp come on when he does this.

Welcome to the forum
 

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hi my fathers w140 s500 has a problem....if you pump the pedal quickly it cuts out or runs lumpy does anyone have any idears please.

I take it the "the pedal" is the brake pedal, if so by doing so, your feeding neat air into the engine via the brake servo, as this is where it gets its vacuum from and will cause the engine to run weak. This will not help but does not normally cause stalling unless there is something else wrong.
 

jibcl500

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Brake pedal switch failure causing torque converter lock out, rough idle ? car vibrates throughout etc are these the symptoms?

jib
 
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amg500

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sorry......when he pumps the ACCELLARATOR revs drop or cut out
 

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