88subaru Posted July 7, 2017 Share Posted July 7, 2017 I have a 1988 Subaru gl. There appears to be 3 coolant temperature sensors on here. There is one in the radiator- 2 wires. One on the thermostat housing that is two wires, and one that is a single wire connector with a little spade on it. What do all three of these do separately and which one would control my fuel? Also, what are the ohms supposed to be on all three sensors while unplugged with the engine off? I'm having issues with it running rough. It won't idle but for 2 seconds on start up, then it stalls. If I start it and rev up the throttle, it'll go up to 4,000 rpm, but as soon as I let off the throttle it'll lower rpm quick then die. If I spray starting fluid in the tb, it'll run perfectly all day long. The fuel injector seems to not be spraying the right amount of fuel. What sensors control the fuel injection on an spfi ea82 motor? I have excellent fuel pressure, that's not the issue! I've got a clean throttle body. I have replaced the following- Fuel tank, fuel pump, fuel filter, fuel injector, vacuum and egr solenoids, egr valve, iac valve, spark plugs, fuel pressure regulator, fuel pressure dampers... Any help/input is appreciated. Quote Link to comment Share on other sites More sharing options...
Gloyale Posted July 7, 2017 Share Posted July 7, 2017 2 wire in the Radiator is a Switch, not sensor. Turns on the Rad fan when it gets hot (closes switch) 1 wire in the thermostat area is the one for the gauge. No connection to fuel 2 wire in the Thermostat area is the true sensor for the ECU fuel mixture. Resistance value drops from high to lower as temp rises. Resistance should be 2000-3000 Ohms when cold (68 deg) and around 250 ohms when hot. (190 deg) 2 Quote Link to comment Share on other sites More sharing options...
scoobiedubie Posted July 13, 2017 Share Posted July 13, 2017 O2 sensor on the exhaust catalytic converter also has an effect on how smoothly the engine runs when cold. They are cheap to replace. Quote Link to comment Share on other sites More sharing options...
88subaru Posted July 13, 2017 Author Share Posted July 13, 2017 Scoobiedubie, when I start the car, it’ll run high rpm then stall. If the O2 sensor is faulty, could it cause it to hesitate when trying to accelerate? Quote Link to comment Share on other sites More sharing options...
DaveT Posted July 13, 2017 Share Posted July 13, 2017 The O2 sensor is not used until the engine is up to normal operating temperature, and the ecu goes into closed loop mode. The CTS can cause all kinds of odd running / drivability issues when it is failing, and it doesn't always cause a code to set the CEL. Quote Link to comment Share on other sites More sharing options...
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