Engine temp
Racer
Joined: Jun 1999
Posts: 407
Likes: 91
From: Chandler Arizona
My GS runs great when it is 115 F or above in traffic with the AC on full it stays at 210 or below. So what if it cycles a little above and below 180 when it is 50 F and get a yellow bar occasionally. It doesn’t require excessive warm up time indicating a stuck open thermostat and doesn’t overheat indicating a stuck closed thermostat. There is no problem.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,019
Likes: 12,401
From: NE South Carolina
^^^
Perhaps but the air/fuel MAP uses temp as a key input on where to set it. At some lower temp it is setting a richer mixture. I have been on the C7 forum even before I got my Z51 the 1st week in October 2013. I don't recall any posts discussing the yellow halo coming back after warm up. Perhaps there were some but it appears to me GM got some incorrect thermostats!
I also run about 190/195 min NOT 180. The Z51 was the same as my Grand Sport. As I showed in post #16 the Service Manual says the thermostat should start to open at 188 F and be fully open at 206 F.
Perhaps but the air/fuel MAP uses temp as a key input on where to set it. At some lower temp it is setting a richer mixture. I have been on the C7 forum even before I got my Z51 the 1st week in October 2013. I don't recall any posts discussing the yellow halo coming back after warm up. Perhaps there were some but it appears to me GM got some incorrect thermostats!
I also run about 190/195 min NOT 180. The Z51 was the same as my Grand Sport. As I showed in post #16 the Service Manual says the thermostat should start to open at 188 F and be fully open at 206 F.
Last edited by JerryU; Jan 27, 2019 at 07:15 PM.
Race Director
Joined: May 2001
Posts: 15,324
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From: Guelph, Ontario
