W124 rev limiter

[Williamwoo]

Hi all,

How does the rev limiter work on an E320 (1995)? Mine will not rev above about 3000rpm (getting very jerky at that speed), regardless of gear (so for example I cannot exceed 70mph-ish at the moment).

I know that there is a limit on the engine speed when in neutral/park (which I thought was 4000rpm?) but how does it actually work - does the gearbox tell the ecu when it is in neutral/park or is it triggered by the road speed somehow?

Below 3000 all is fine (and I have recently replaced wiring loom, plugs, leads and coil packs).

Thanks in advance.

 

[Williamwoo]

Hi,

In case anyone else gets this problem, I have worked out what the issue is. Despite an ECU specialist (ECU Doctor) saying there was nothing wrong with it, I tracked down a replacement ECU (from Ukraine of all places) and all is well once more, and I am a happy man again.

 

[WDB124066]

Did the damaged unit show any codes....

 

[Williamwoo]

Did the damaged unit show any codes....

Apparently not.