High Idle RPM, 1990 ZR-1 - ZR-1 Net Registry Forums

Anonymous · 12-13-2003

I have a 1990 Zr-1 with 112K miles on it. I had a local Chevy dealer put in a new radiator about 2 weeks ago. The car ran great. The other day, I drove the car and noticed that the idle RPM was high (1500 vs. 800). To lower the RPM, you have to "kick" the throttle for it to come back down. I looked under the hood, and found no vacuum lines detached. I did notice that there was a small air filter missing from what looks like a air pump of some sort. Could something get sucked into the vacuum system that could be causing this?

12-13-2003	#1
Anonymous Join Date: Dec 2003 Posts: 491	High Idle RPM, 1990 ZR-1 I have a 1990 Zr-1 with 112K miles on it. I had a local Chevy dealer put in a new radiator about 2 weeks ago. The car ran great. The other day, I drove the car and noticed that the idle RPM was high (1500 vs. 800). To lower the RPM, you have to "kick" the throttle for it to come back down. I looked under the hood, and found no vacuum lines detached. I did notice that there was a small air filter missing from what looks like a air pump of some sort. Could something get sucked into the vacuum system that could be causing this?