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Does the engine achieve closed loop control? A common easy view I take on these systems is to watch the activity of control at various different constant engine speeds, preferably under load. My break out leads are about ten feet long and I monitor while controlled driving.
The degree of control shouldn't be different by more than ten percent at any constant load. If the system can not maintain control the EHA current will peg plus or minus 12ma. The characteristic of control is what is required to evaluate. What happens to closed loop? Does it peg lean or rich?
Before doing any of that be sure that the airflow meter moves freely and there is proper 2-4mm free movement before the piston is lifted; and that the point of engagement is right at the base of the flat vertcle cylinder at the center of the cone..
Beyond this, one will need to evaluate system and differential pressure and the relationship to electronic control or you need to flow test. Included is a picture of a flow test on an electronic injected v8 BMW. The same equipment (differential flow meter) was originally designed for K-jet.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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