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. Link to comment Share on other sites More sharing options...
BEECHBM69 Posted July 7, 2017 Share Posted July 7, 2017 The one on the radiator is the fan thermo switch. I'm fairly certain the one near the thermostat is the temp gauge sender. Not sure about the third one you referenced with the single spade. Whereabouts is that located? Dan Link to comment Share on other sites More sharing options...
alexbuoy Posted July 7, 2017 Share Posted July 7, 2017 The single spade is for the temp sensor on the dash. The green connector is the one for the ecu. The green connector is the one that controls fuel, and with a bad temp sensor for the ecu it will be hard to start a warm engine. don't quote me on this i don't remember on the top of my head 2 Link to comment Share on other sites More sharing options...
pbilt Posted July 7, 2017 Share Posted July 7, 2017 Can you see the injector firing if you look down the thought of the tb? If you give it one shot of starting fluid at fist start it will run fine all day at all rpms or do you have to keep feeding it fluid to keep it ideling sounds to me like cam timing. But if its idleing and driving fine after a shot down the thought that rules that out Link to comment Share on other sites More sharing options...
Subaru Scott Posted July 7, 2017 Share Posted July 7, 2017 Sounds like a bad vacuum leak to me. Link to comment Share on other sites More sharing options...
DaveT Posted July 7, 2017 Share Posted July 7, 2017 The sensor with 2 wires, on the thermostat housing is the one that the ecu uses. The ohm readings were posted in a thread this year, and are in the fsm. Link to comment Share on other sites More sharing options...
czny Posted July 7, 2017 Share Posted July 7, 2017 (edited) Are you sure you didn't pinch the throttle body gasket, that is if you removed it to change the IAC? You might clean the temp sensor, IAC, engine harness(main harness connections below the coil) & ECM connectors. I had an intermittent CEL on my 87 GL recently that was caused by bad connections - the ECM connections under the dash had dust in them. Use contact cleaner. And yes, this did affect startup & cold idle. What made no sense was that it ran so well without any apparent errors until after a long trip to AZ & back. I kept getting temp sensor, IAC, crank angle sensor & speed sensor codes that would never clear, yet all sensors, etc. tested good. Edited July 7, 2017 by czny Link to comment Share on other sites More sharing options...
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