High Coast- / start up idle - ZR-1 Net Registry Forums

S.hafsmo · 07-29-2020

I've always had periodic high idle (1500-1800 RPM) while coasting and just after start up. It did improve with the Haibeck chip, but it's still very much present. My throttle body has also been refurbished by Mark. Except of the above mentioned situations, it idles steady around 750 RPM.

Is this normal? Might it be caused by a slow/defective IAC?

07-29-2020	#1
S.hafsmo Join Date: Nov 2016 Location: Norway Posts: 397	High Coast- / start up idle I've always had periodic high idle (1500-1800 RPM) while coasting and just after start up. It did improve with the Haibeck chip, but it's still very much present. My throttle body has also been refurbished by Mark. Except of the above mentioned situations, it idles steady around 750 RPM. Is this normal? Might it be caused by a slow/defective IAC? __________________ - '90 ZR-1 Last edited by S.hafsmo; 07-29-2020 at 12:38 PM.