My first thoughts are fuel starvation.

I had a vehicle that would not rev one time, had a crushed fuel line. Not saying THAT is your issue, but I would try to do a fuel pressure check under load and see what is going on.

Can easily rule out the CIS ECU by disconnecting it. Also worth checking out the O2 function.



Will it rev up in neutral?

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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