Loud engine when starting

[SVAMG]

Hello all,

I hope you are all well. I am new to the forum and as a young owner I require advice from more experienced owners.

I drive a Diesel 2009 E220 with approximately 140,000 miles on the clock now. Bought the car in the February had quite a bit of work done to it since then. Will list if needed.

When I cold start the vehicle the engine is really loud and nearly holds 1,000 revs for approximately 4-6 seconds before quietening down and dropping down to 650/700 revs. It takes approximately 15-20 minutes to hit 60 degrees (coolant pump was replaced two months ago as there was a very slight leak) and then reach 80 degrees reasonably quick once I start to drive.

The car also feels a lot more sluggish now as opposed to before. I am not sure if this is down to the cold.

Any and all advice is greatly appreciated.

 

[Tonygw]

Do you know the engine code, if its the OM651 they suffer from timing chain stretch. If you here a loud clack clack clack for 4-5 seconds coming from the back of the engine after a cold start its a sure sign its worn. It will need replacing quickly to prevent further damage. No the end of the world.. estimate about £700 for the job at a good merc specialist. I'm not saying thats what it definatekly is.. just its fairly common.

But posting a nice video of the noise may help us to help you