I thought the car was running rich, as I was in back of the car while it was running and the exhaust made my eyes water, so I hooked up the car to the computer and looking at freescan, I saw the water temp was 84 degrees, when it was 99 degrees outside and my temp gauge was at 180 ish. My iat temp was at 52 degrees. All other parameters looked good in freescan. I checked the wires to both the iat and coolant sensor on the water pump, as I lengthened them when I did my ls1 lid modification. To lengthen the wires I used the wiring from another harness I had that went to the same sensors, so all the wiring is the same gauge and color code. I also did NOT solder the wires, just twisted them together and used heat shrink tubing. All 4 wires looked good (2 for the iat and 2 for the coolant sensor), so then I thought that it may be a bad ground with these two sensors. I made a different ground to both the iat and coolant sensors, cut the existing ground wires to both sensors and grounded both wires to the engine block. Warmed the car up, but still had the same results. When I first start the engine, the iat is at 33 degrees and the coolant temp is at 40 degrees. The sensors are working as the do increase. So looking for any ideas or suggestions as to what to try next, so please let me know.

tia

andy schuck

 

it could be that the sensors themselves have gone bad. you should probably try testing them

 

Shoebox has the info you need:

http://shbox.com/1/4th_gen_tech2.html#ect