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Rebuilding the top end on my '85 and was cleaning up some of the wiring. Should have left crap alone. Cut the sensor plug off thinking it was the leftover 9th injector clip. There are 2 wires coming off the sensor plug but the reason i cut it is it split off and was capped and only (1) wire went anywhere-i think. I only remember cutting the one wire but the where the heck does the other one go? i have a full shop manual but i am terrible at wiring diagrams. Any help would be beneficial.
Even better....i didn't notice until i had the top of my superam all bolted down.
check to see if its the wire that goes to the fitting in the front of the inlet manifold, the one that has brown bakerlite on it. It has 2 blades in it.
this sensor activates the 9th injector in the 85.
if you have de-activated your 9th injector it shouldnt matter.
Here is a closeup of the sensor. i guess it would make "sense" it controlling the cold start injector. I have read elsewhere that the ECM uses it to control the air fuel ratio and if its not hooked up correctly the motor could lean out or run rich.
The connector for the cold start injector thermo switch looks like a fuel injector connector. It does not connect to the ECM in any way and only works while the engine is cranking.
The other 2 wire connector on the front of the intake manifold is the coolant temperature sensor for the ECM. The ECM uses it to determine injector pulse width and ignition timing, so it is VERY important and has a major impact on how well the engine runs.
The connector for the cold start injector thermo switch looks like a fuel injector connector. It does not connect to the ECM in any way and only works while the engine is cranking.
The other 2 wire connector on the front of the intake manifold is the coolant temperature sensor for the ECM. The ECM uses it to determine injector pulse width and ignition timing, so it is VERY important and has a major impact on how well the engine runs.
Do you know where the two wires from the front of the engine sensor go? I reconnected the one I cut but the other one was capped. Thanks
Do you know where the two wires from the front of the engine sensor go? I reconnected the one I cut but the other one was capped. Thanks
Both of them go to the ECM. One is for the sensor output and the other is a reference ground from the ECM. Using a reference ground makes the measurement more accurate.
They go into the engine harness and through the firewall via the bulkhead feedthrough behind the passenger side head.
01-28-2015, 10:22 PM
Coolant Temperature sensor-whoops
