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articles:cis-e_fuel_adjustment [2021/04/05 07:42] – [Reading the on/off ratio] john5788 | articles:cis-e_fuel_adjustment [2021/10/02 02:10] – [Adjusting Fuel Distributor Screw] john5788 | ||
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==== Notes and Exceptions ==== | ==== Notes and Exceptions ==== | ||
+ | * 1986 190E 2.3-16 - This ECU does not need to be switched into a special mode. The on/off ratio will be available after the engine has been running for 30 seconds. | ||
* 1993 190E 2.6 - This ECU does not need to be switched into a special mode. The on/off ratio will be available after the engine has been running for 30 seconds. | * 1993 190E 2.6 - This ECU does not need to be switched into a special mode. The on/off ratio will be available after the engine has been running for 30 seconds. | ||
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+ | **Example: | ||
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===== Performing Adjustments ===== | ===== Performing Adjustments ===== | ||
+ | |||
+ | The adjustment procedure can be generalized as follows: | ||
+ | |||
+ | - Engine is at operating temperature, | ||
+ | - Record average duty cycle at engine idle | ||
+ | - Record average duty cycle at engine speed of 2500 RPM | ||
+ | - Adjust EHA valve and adjustment screw on fuel distributor until duty cycle for engine speeds at idle and 2500 RPM are near 50% and within 10% of each other | ||
+ | |||
+ | ==== Adjusting EHA Valve ==== | ||
+ | |||
+ | |||
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+ | - Remove EHA valve from fuel distributor | ||
+ | - 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 at your face | ||
+ | - Pull EHA valve off fuel distributor, | ||
+ | - 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) | ||
+ | - 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 | ||
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+ | ==== Adjusting Fuel Distributor Screw ==== | ||
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+ | 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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+ | - Insert 3mm allen key or screwdriver into the adjustment tower. | ||
+ | - Push down against spring until the screw fully contacts the mixture setting screw. Pushing further past this point will cause engine to stall. | ||
+ | - 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. | ||
+ | - Use small increments for adjustments such as 1/4 of a turn while checking the new duty cycle or voltage to avoid making large changes that could cause the engine to stall or not start. | ||
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