Hi all happy new year to you, newbee Nozzer here , I’m old school customisation m

[Kevan cross]

i have just restored a 1999 ML 320 for my wife as her Christmas present, but I have an issue with a engine judder at about 40000 RPM ? It starts on the button every time and runs really smooth but increase the revs with no load to about 40000 RPM and we get the judder ? Could this be electrical or fuel , any help appreciated

 

[LostKiwi]

Wow... I'm amazed it doesn't self destruct before it gets to 40,000rpm!

Mercedes engines are designed not to rev in neutral. The ECU will limit rpm unless in gear.

 

[AMGeed]

Lol, As above a limit of 4k is the maximum in neutral for the engine. There is nothing wrong.

 

[Wighty]

Lol, As above a limit of 4k is the maximum in neutral for the engine. There is nothing wrong.

It's an 18 year old Merc buddy , there's going to be loads wrong

 

[John Laidlaw]

Engine protection indeed

 

[Craiglxviii]

Yup. Don’t rev past 2k in Park or neutral!

 

[A.J.]

Hi Kevan, welcome to the forum, not that I ever try to rev the car in neutral but we all live and learn.