Idle speed high then slowly comes down. - ZR-1 Net Registry Forums

Anonymous · 12-14-2003

My 91 zr1 seems to hold a high idle (1200) when cold then drops down to the 700-800s where it should be. as it warms up it slowly goes away. Somewhere I read there is a prom fix for this. How to get it? How much? Or is this a vacuum leak and we should start thinking about a pull of the plenum? Your thoughts!

12-14-2003	#1
Anonymous Join Date: Dec 2003 Location: Grand Blanc, MI Posts: 491	Idle speed high then slowly comes down. My 91 zr1 seems to hold a high idle (1200) when cold then drops down to the 700-800s where it should be. as it warms up it slowly goes away. Somewhere I read there is a prom fix for this. How to get it? How much? Or is this a vacuum leak and we should start thinking about a pull of the plenum? Your thoughts!