idlesurge
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idlesurge [2010/04/09 13:01] dmertz created |
idlesurge [2010/04/09 13:05] dmertz |
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| With all other possibilities eliminated, the remaining item to check is the throttle plate. a too-tight throttle cable can pull the thottle open, more so as the throttle-cable hosing heats up, so make sure that the throttle cable has sufficient slack to allow the throttle to close to the stop even when the engine is hot. Check that the throttle is against the stop by manually rotating the throttle shaft closed. Make sure that nothing is binding the throttle shaft such as bad bearings or a badly adjusted throttle-position sensor. | With all other possibilities eliminated, the remaining item to check is the throttle plate. a too-tight throttle cable can pull the thottle open, more so as the throttle-cable hosing heats up, so make sure that the throttle cable has sufficient slack to allow the throttle to close to the stop even when the engine is hot. Check that the throttle is against the stop by manually rotating the throttle shaft closed. Make sure that nothing is binding the throttle shaft such as bad bearings or a badly adjusted throttle-position sensor. | ||
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| ===== Other considerations ===== | ===== Other considerations ===== | ||
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| Ignition timing also has some effect on idle speed. In fact, the ECU normally varies ignition timing at idle to provide fine control over the idle speed. Make sure that base ignition timing is set properly. | Ignition timing also has some effect on idle speed. In fact, the ECU normally varies ignition timing at idle to provide fine control over the idle speed. Make sure that base ignition timing is set properly. | ||
| - | If you are running a configured idle speed that's higher than stock, it's possible to observe a slight oscillation in idle speed even when everything else is working properly. This is because, by default, the timing tables in the ECU significantly advance ignition timing as the engine speed rises above 750 rpm. You'll want to retard the ignition timing at idle and slightly above idle to prevent this oscillation by giving the ECU's fine idle control mechanism more authority. | + | If you are running a configured idle speed that's higher than stock, it's possible to observe a slight oscillation in idle speed even when everything else is working properly. This is because, by default, the timing tables in the ECU significantly advance ignition timing as the engine speed rises above 750 rpm, and engine speed tends to increase as ignition timing is advanced. You'll want reduce this positive feedback by retarding the ignition timing at idle and slightly above idle. It also helps by giving the ECU's fine idle control mechanism more authority. |
idlesurge.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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