Hello All,
This is a continuation of a thread on the C3 Engine Forum. 82 Coolant Sensor Replacement. Up to this point I have been chasing a high idle problem with my 1982 CFI. Up to a year and a half ago, I was driving summers with the vette in New England. I pretty much ran the Air Conditioning during this entire time. It was very humid on Cape Cod.
After moving to Arizona, I get to use the vette year round. It does get cool and even cold (32 degrees F) in the desert. But, during the summer and fall it is still very warm here.
I had the intake manifold gasket replaced in order to pass emissions. The car ran well except there was a high idle; 1100 to 1500 rpm with the AC turned off. I also replaced the in tank fuel pump, filter and the short line that had deteriorated. That took care of surging rpm and a bad hesitation on accelerating. The car was barely drivable when it arrived here in AZ.
So far, I have replaced about 12 feet of vacuum lines, the O2 sensor – due to code, the EGR valve, hooked up the warm air inlet flapper in the intake snorkel, the coolant temperature sensor and today, the MAP sensor. Unrelated but as a consiquince of changing the coolant temp sensor, I had to replace the upper radiator hose which started leaking when I removed and reinstalled it to get to the coolant temperature sensor. My wife wants me to replace the lower hose too before we trek across the desert. I think that is a good idea. That is on tap for this afternoon.
As a note: The EGR valve was installed but was blocked off by a blank of gasket material. The vacuum lines to the air inlet temperature switch in the air cleaner and to the warm air inlet flapper door were missing – had to be done by a previous owner. Many of the vacuum lines were cracked and leaking. I used carb cleaner sprayed lightly around the vacuum lines and connectors to find the leaks. I also checked around the base of the throttle bodies.
I am just getting to the problem of a sheared pivot bolt on the AC compressor lower mounting bracket. Having the lower radiator hose out of the way will help. So the process goes on. I hope to temporally support the compressor while I remove the lower bracket and get the sheared off threaded end of the bolt out of the threaded mounting bracket and replace the bolt. I'll post some pictures of the process. You see, when that bolt broke I had to turn off the AC and the high idle became a real issue. It was idling at 1700 rpm yesterday. The AC loaded the engine enough to make the idle only a little high.
Joel Adams
C3VR Lifetime Member #56
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