idlesurge
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idlesurge [2010/04/09 13:06] twdorris |
idlesurge [2010/04/09 13:07] dmertz |
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| * a damaged diaphragm in the wastegate actuator | * a damaged diaphragm in the wastegate actuator | ||
| * a damaged diaphragm in the power-brake booster | * a damaged diaphragm in the power-brake booster | ||
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| Strange behavior can result from a bad Fast-Idle Air Valve. This is a coolant-temperature controlled air valve that provides some of the additional air needed for fast idle during engine warm-up. This valve is integral to the throttle body, so test by substitution or by blocking the FIAV passage with a block-off plate. | Strange behavior can result from a bad Fast-Idle Air Valve. This is a coolant-temperature controlled air valve that provides some of the additional air needed for fast idle during engine warm-up. This valve is integral to the throttle body, so test by substitution or by blocking the FIAV passage with a block-off plate. | ||
| - | 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 housing 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. |
idlesurge.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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