High Idle on Start up - ZR-1 Net Registry Forums

bike01 · 08-10-2005

My '91 zr-1 will idle 1500 - 2000 rpm right from start up in the mornings and stay there until the car warms up. After it reaches operating temperature, the idle will drop down to about normal. Any ideas. Doesn't happen al of the time.

RiceEatingZR1 · 08-10-2005

Quote:

Originally Posted by bike01

My '91 zr-1 will idle 1500 - 2000 rpm right from start up in the mornings and stay there until the car warms up. After it reaches operating temperature, the idle will drop down to about normal. Any ideas. Doesn't happen al of the time.

I had a High Idle that turned out to be a Vaccum leak under the plenum, however my high idle never settle down to normal RPM's, it might be the ECM Chip do you have any after market chip?

Kevin · 08-10-2005

did the 91's have the same high idle problem as the 90's that went away if you changed the prom?

zr1mom · 08-10-2005

Yes they did.

http://www.zr1netregistry.com/ZR1_issues.htm#2

We Gone · 08-10-2005

Look for the part # on the mem-cal

I think this is the updated Chip # 16193416 for 91

Kevin · 08-10-2005

Or you just just get an after market one from mark haibeck or someone like that

08-10-2005	#1
bike01 Join Date: Apr 2004 Posts: 14	High Idle on Start up My '91 zr-1 will idle 1500 - 2000 rpm right from start up in the mornings and stay there until the car warms up. After it reaches operating temperature, the idle will drop down to about normal. Any ideas. Doesn't happen al of the time.

08-10-2005	#3
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	did the 91's have the same high idle problem as the 90's that went away if you changed the prom? __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

08-10-2005	#4
zr1mom Join Date: Dec 2003 Location: New Hampshire Posts: 421	Yes they did. http://www.zr1netregistry.com/ZR1_issues.htm#2 __________________ ZR-1 Mom Founder ZR-1 Net Registry Founder ZR-1 Net NCM Lifetime Member

08-10-2005	#5
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,169	Look for the part # on the mem-cal I think this is the updated Chip # 16193416 for 91 __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

08-10-2005	#6
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Or you just just get an after market one from mark haibeck or someone like that __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"