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articles:cis-e_fuel_adjustment [2021/09/07 05:43] – [Adjusting EHA Valve] john5788 | articles:cis-e_fuel_adjustment [2021/12/04 03:51] (current) – [Adjusting EHA Valve] john5788 | ||
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At this point, the control unit should be in the diagnostic mode for outputting the fuel trim as an on/off ratio. After this, when the engine is started, the CHECK ENGINE LIGHT should be illuminated. | At this point, the control unit should be in the diagnostic mode for outputting the fuel trim as an on/off ratio. After this, when the engine is started, the CHECK ENGINE LIGHT should be illuminated. | ||
- | ==== Notes and Exceptions ==== | + | **Note:** Some ECUs do not require being put into a diagnostic |
- | + | ||
- | | + | |
- | * 1993 190E 2.6 - This ECU does not need to be switched into a special mode. The on/off ratio will be available | + | |
===== Reading the on/off ratio ===== | ===== Reading the on/off ratio ===== | ||
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==== Adjusting EHA Valve ==== | ==== Adjusting EHA Valve ==== | ||
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- Remove EHA valve from fuel distributor | - Remove EHA valve from fuel distributor | ||
- Unplug wire connector | - Unplug wire connector | ||
- | - Remove 2 screws holding EHA valve to fuel distributor while covering the EHA valve with a rag to catch fuel that will squirt | + | - Remove 2 screws holding EHA valve to fuel distributor while covering the EHA valve with a rag to catch fuel that will squirt |
- Pull EHA valve off fuel distributor, | - Pull EHA valve off fuel distributor, | ||
- Remove the screw cover with a flathead screw driver | - Remove the screw cover with a flathead screw driver | ||
- Use a 2mm allen key to turn the adjustment screw inside the EHA valve with small adjustments (1/4 turn at a time) | - Use a 2mm allen key to turn the adjustment screw inside the EHA valve with small adjustments (1/4 turn at a time) | ||
- | - | + | - Turn clockwise to **enrichen the fuel mixture**. This **decreases the duty cycle** or **increases the voltage**, depending on whatever method you are using. |
+ | - Turn counter-clockwise to **lean the fuel mixture**. This **increases the duty cycle** or **decreases the voltage**, depending on whatever method you are using. | ||
- Reinstall EHA valve | - Reinstall EHA valve | ||
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==== Adjusting Fuel Distributor Screw ==== | ==== Adjusting Fuel Distributor Screw ==== | ||
- | If there is a steel plug present, it needs to be drilled out first. | + | If there is a steel plug present, it needs to be drilled out first. Engine must be idling for this adjustment. |
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