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bike01
08-10-2005, 02:57 PM
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, 05:49 PM
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, 06:18 PM
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, 06:37 PM
Yes they did.

http://www.zr1netregistry.com/ZR1_issues.htm#2
We Gone
08-10-2005, 06:43 PM
Look for the part # on the mem-cal

I think this is the updated Chip # 16193416 for 91
Kevin
08-10-2005, 07:02 PM
Or you just just get an after market one from mark haibeck or someone like that