1st Gear Member
Join Date: Oct 2003
Location: Kansas City, MO USA
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The e21 had a CIS injection system.
I would be suspect of the WUR, Warm Up Regulator.
It controls the fuel pressure and sets the warm fuel pressure also.
Here is a diagram of the issues.
Of course the AFM, Air Fuel Mixture can be set to max RPM with a 3mm allen wrench.
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