idlesurge
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idlesurge [2010/04/09 13:05] dmertz |
idlesurge [2010/04/09 13:06] twdorris |
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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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| ===== Throttle-body problems ===== | ===== Throttle-body problems ===== | ||
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| You may find that screwing the BISS all the way in doesn't bring the idle speed down to idle speed configured in DSMLink/ECMLink. That means that some other path is allowing too much air to pass. First make sure that there is no leakage into the BISS hole by covering the hole with your finger. If the engine speed drops when you cover the hole, replace the BISS O-ring. | You may find that screwing the BISS all the way in doesn't bring the idle speed down to idle speed configured in DSMLink/ECMLink. That means that some other path is allowing too much air to pass. First make sure that there is no leakage into the BISS hole by covering the hole with your finger. If the engine speed drops when you cover the hole, replace the BISS O-ring. | ||
| - | Next, investigate possible problems with the Idle Speed Control (ISC) servo. Open the ECU and [[Driver01|inspect for burned ISC driver chips]]. If you fing any, [[http://www.ecmtuning.com/product/servicerequest|contact ECMTuning regarding repair of the ECU]]. If there //are// burned drivers, it's quite possible that the damage was caused by ISC itself having a shorted coil. | + | Next, investigate possible problems with the Idle Speed Control (ISC) servo. Open the ECU and [[Driver01|inspect for burned ISC driver chips]]. If you find any, [[http://www.ecmtuning.com/product/servicerequest|contact ECMTuning regarding repair of the ECU]]. If there //are// burned drivers, it's quite possible that the damage was caused by ISC itself having a shorted coil. |
| [[http://www.youtube.com/watch?v=KibYz21IMA0|Test the coils in the ISC.]] (Note that the newer, more reliable, all-black ISCs normally measure about 39 ohms.) Inspect the tip of the ISC for any physical damage. | [[http://www.youtube.com/watch?v=KibYz21IMA0|Test the coils in the ISC.]] (Note that the newer, more reliable, all-black ISCs normally measure about 39 ohms.) Inspect the tip of the ISC for any physical damage. | ||
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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 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. |
idlesurge.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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