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Rversteeg · Nov 25th, 2020, 11:04

Did you check the setting and function of the Throttle Position Switch? If the ECU is not aware that you have taken your foot off the gas it might be too slow in responding / anticipating by opening the idle air valve. The engine speed then drops below 800 rpm (to around 500 tpm if the throttle has been set correctly) before opening the idle air valve.

Nov 25th, 2020, 11:04	#3
Rversteeg Master Member Last Online: Today 08:48 Join Date: Feb 2006 Location: Amersfoort (NL)	Tps Did you check the setting and function of the Throttle Position Switch? If the ECU is not aware that you have taken your foot off the gas it might be too slow in responding / anticipating by opening the idle air valve. The engine speed then drops below 800 rpm (to around 500 tpm if the throttle has been set correctly) before opening the idle air valve.