With the cps unplugged the computer has no idea when to inject fuel, how much to lift the valve how long to hold them open. The engine must have a limp home mode that's engaged so the engine will run, it probably disabled the valvetronic completely I can't imagine how much power is lost.

You need to have the car running with all CPS and root out the actual problem.

As I said first post, swap CPS bank and see if the problem follows

What are the symptoms? Backfire? Very rough idle? Does it clear up when engine is warm?

Also: when did the problem start? Did it happen suddenly or did it start mild and get worse?


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)