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Z3 3.0 Coupe auto to manual swap


Hey all,

My buddy just picked up a 2001 z3 coupe with a unfinished auto to manual swap.  Cuts RPM at 5k gives a shift selonoid b, lean bank 1 and lean bank 2 codes.  Have cleared memory on impa and no change.  Not sure if it has been reflashed.  No history on it.  Looks like some bridging between the brake wiring to something. have replaced fuel filter and doesnt seem to have vacuum leaks (will check more).  The abs is unhooked and no sensors on any corner. Any advice on this?

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I dont suspect the lean codes relate to the swap. I would recommend, in this order:

-see how the car drives with the MAF unplugged

-check for intake leaks with a smoke test, namely intake boot. 

-check condition of spark plugs

-replace fuel filter

-replace MAF

-replace O2 sensors

-replace spark plugs and coils

-replace/clean injectors

It is most likely related to intake leaks but multiple weak areas can add up to a single issue


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