Where is the EHA on a Mercedes Benz?
There is an adjustment to the electro-hydraulic actuator (EHA) that hangs off the back side of the fuel distributor. This is the gizmo that takes the commands from the ECU and adjusts the fuel distributor pressure. It’s the “muscle” for the ECU’s “brains”.
Where is the EHA adjustment screw on a Mercedes?
The adjustment screw isn’t visible with the EHA on the fuel dist. Once you undo the electrical connector and remove the two screws holding the EHA to the dist (watch for the fuel spritz) you can pull it off. Make sure the two O-rings that seal the EHA to the dist aren’t lost.
Is it possible to adjust an EHA on a M103?
I stumbled across a paragraph on M103 drivability & the problems described fit me to a T. There is an adjustment to the electro-hydraulic actuator (EHA) that hangs off the back side of the fuel distributor. This is the gizmo that takes the commands from the ECU and adjusts the fuel distributor pressure. It’s the “muscle” for the ECU’s “brains”.
How does the EHA work in a car?
The EHA works in conjunction with the fuel-air mixture adjustment (duty cycle) as described earlier. The EHA is sort of a final compensation in the system to try to keep it within proper operating parameters.
There is an adjustment to the electro-hydraulic actuator (EHA) that hangs off the back side of the fuel distributor. This is the gizmo that takes the commands from the ECU and adjusts the fuel distributor pressure. It’s the “muscle” for the ECU’s “brains”.
The adjustment screw isn’t visible with the EHA on the fuel dist. Once you undo the electrical connector and remove the two screws holding the EHA to the dist (watch for the fuel spritz) you can pull it off. Make sure the two O-rings that seal the EHA to the dist aren’t lost.
I stumbled across a paragraph on M103 drivability & the problems described fit me to a T. There is an adjustment to the electro-hydraulic actuator (EHA) that hangs off the back side of the fuel distributor. This is the gizmo that takes the commands from the ECU and adjusts the fuel distributor pressure. It’s the “muscle” for the ECU’s “brains”.
How does EHA work in a CIS-E car?
One of the more common issues that come up with regard to the drivability of the CIS-E-based cars (420s and 560s, among other lesser cars such as M102 and M103-based models) are the two major system adjustments — the duty cycle (controlled by the CIS-E mixture control) and the fuel injection control pressure (controlled in part by the EHA servo).