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HI
when i start my car w202 C200 the idle rev is fine its only when i have driven a little bit and i put it in neutral or park the rev starts to climb up to 1500 and stay there, but if you turn it off and start it again it will be below 1000. any idea why this is happening?
thank you in advance
 

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1998 c230 170K
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Sounds like throttle body

HI
when i start my car w202 C200 the idle rev is fine its only when i have driven a little bit and i put it in neutral or park the rev starts to climb up to 1500 and stay there, but if you turn it off and start it again it will be below 1000. any idea why this is happening?
thank you in advance
Give a look inside the throttle body for dirt and gummy build-up, throttle plate might be sticking open at idle. If thats the case its an easy job of spraying some cleaner in there. Remember a little bit goes a long way. B
 
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