Knocking sound when starting the car and sometimes stays longer and ticking
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Junior Member
Joined: Aug 2017
Posts: 24
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From: Heaven
2012 Mercedes Benz E350 4Matic | 2013 Mercedes Benz GL450 4Matic
Knocking sound when starting the car and sometimes stays longer and ticking
I hear this knocking sound in the engine or transmission when starting the car and once warmed it goes away sometimes it stays longer after warm up and even when I drive and accelerate the knocking sound is louder and accelerates matching the acceleration of the car. Is this normal what is causing this?
Senior Member
Joined: Jun 2013
Posts: 284
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From: Los Angeles, CA
MB W212, MB W218, BMW F06, BMW F48
Have you tried getting your exhaust checked? It makes that rattling tapping noise too and it sounded that it was coming from engine bay and it just happened the exhaust piping clamps were loose.
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Joined: May 2016
Posts: 8
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E300
I have the same issue and its strange issue ever.
after my troubleshooting I can summarize it that knocking sound while driving is due to :
1- Fuel quality.
2- (this is highly expected) Gas pedals balancing and it must be by programming not manual. ( i had tried this and it was succeeded).
for point number one I made the fuel getting semi empty and after refill it was disappear.
for engine start I think its normal as my dealer has informed
after my troubleshooting I can summarize it that knocking sound while driving is due to :
1- Fuel quality.
2- (this is highly expected) Gas pedals balancing and it must be by programming not manual. ( i had tried this and it was succeeded).
for point number one I made the fuel getting semi empty and after refill it was disappear.
for engine start I think its normal as my dealer has informed
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