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15hp Evinrude, to start must hold throttle firm towards acceleration position to start, when starts won't idle until hot

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It sounds like your choke is not being used. If you are setting the choke, the carb is venting air somewhere. Take the cover off the motor and look at what is happening to the choke plate when you set the choke.

The choke plate should have either a vent on the butterfly plate if it closes tight or the butterfly plate should be ajar about the thickness of a credit card if the plate is unvented. Then check the mounting nuts on the carb base for tightness. If you want, you can put some ATV around the outside base of the carb to ensure its sealing.

Also note if there is a stepup cam for the choke RPM. This would increase the RPM with adjustment for cold starts and reduce the need to Throttle so much to cold start the engine. If it does not have this part thats Okay too, just a feature to be used if it is there.

Most likely your low speed idle mixture needs adjusting and its common to have the throttle capable of shutting off the engine without a killswitch. But try Cold starting it and see if sealing the carb base and adjusting the butterfly plate has helped. Then do the mixture adjustment if you are not happy with it.

If all this fails to help, have the engine running and try moving the throttle shaft with your fingers. You want to see if the throttle shaft has play where it pivots in the carb body. Its hard to explain but the extra venting of air can occur where the shaft rubs the casting. Depending on your talent it means you need a new carb or you need to rebuild the shaft.

Good luck on your motor.

Posted on Apr 23, 2010

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How to reset ECU,Throttle and Accelerator Position Learning


Hi.

Below the procedure to reset ECU,Throttle and to perform Accelerator Position Learning on Nissan. It works on Titan, Altima, Infinity, pathfinder and other models.

ECU Resetting


While performing the procedures below, ensue that you are respecting the times stated. If the steps are not done within the specified times, the module will not reset. You will need to use a watch or a chronograph while performing the procedures.

Procedure:

1. Ensure that the accelerator pedal is fully released, set ignition switch to the “ON” position, then wait 3 seconds.
2. Follow the steps a and b below, repeat the two steps in sequence quickly for five times within 5 seconds.
a. Push hard the accelerator pedal untill fully depressed.
b. Release the accelerator pedal in full.
3. Wait 7 seconds, then depress the accelerator pedal completely, and hold it for about 10 seconds until the CEL (check engine light) starts blinking.
4. Release the accelerator pedal while the CEL is still blinking.
5. Wait 10 second.
6. Depressthe accelerator pedal in full and hold it for 10 seconds or more.
7. Fully release the accelerator pedal while the CEL light keeps flashing.
8. Turn the ignition switch to “OFF” position and start the vehicle. If procedure has been done correctly, then the light light will turn off.
If the light continues to stay on, repeat the procedure.

Accelerator Pedal Release Position Learning

Procedure

1. Ensure that the accelerator pedal is completely released before starting the procedure.
2. Turn the ignition switch “ON” and wait at least 2 seconds.
3. Turn the ignition switch “OFF”, and wait at least 10 seconds.
4. Turn the ignition switch “ON” and wait 2 seconds.
5. Turn the ignition switch “OFF” and wait 10 seconds.

Throttle Valve Closed Position Learning

Procedure

1. Ensure that accelerator pedal is completely released.
2. Turn ignition switch to the “ON” position.
3. Turn ignition switch to the “OFF” position and wait at least 10 seconds.
Ensure that the throttle valve moves after turning the switch off.

Idle Air Volume Learning (Throttle Position Learning)

Procedure

1. Follow the Accelerator Pedal Released Position Learning described above.
2. Do the Throttle Valve Closed Position Learning also described above.
3. Start the engine, and allow warming up.
4. Turn the ignition on “OFF” positionand wait 10 seconds.
5. Ensure that accelerator pedal is fully released, then turn the ignition switch to “ON” position, and wait 3 seconds.
6. Repeat the steps a and b below five times within 5 seconds in sequence.
a. Push hard the accelerator pedal untill fully depressed.
b. Release the accelerator pedal until reaching full extension.
8. Wait 7 seconds or more, depress the accelerator pedal completely and hold the pedal down for about 20 seconds until you see that the Check Engine Light stops blinking and starts getting steady..
9. Rrelease completely the accelerator pedal within 3 seconds after the light coming ON.
10. Start engine and let it run at idle for about 20 seconds.
12. Test the engine to ensure the idle speed and ignition timing are set correctly.

Regards.

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