338michael Posted January 7, 2017 Share Posted January 7, 2017 Have 88 DL Wagon, mileage not as it should be. Wondering if the Temp Sensor in the Radiator for electric fan has any Fuel/Air control thru the ECU, or is it for fan control ONLY??? Quote Link to comment Share on other sites More sharing options...
DaveT Posted January 7, 2017 Share Posted January 7, 2017 That is just a thermo switch for the fan. The ECU uses a sensor, CTS mounted on the housing just below the thermostat on the intake manifold. It has 2 wires. The single wire one is only for the temp gauge. If the CTS is flaky, the idle speed.is usually messed up, as in high idle when up to temp, or no high idle when cold. Quote Link to comment Share on other sites More sharing options...
scoobiedubie Posted January 8, 2017 Share Posted January 8, 2017 Change the O2 sensor on the exhaust system. That affects fuel/air ratios and gas mileage. It is cheap and fast fix and you have nothing to lose because you will have to change it sooner or later anyways. Quote Link to comment Share on other sites More sharing options...
338michael Posted January 13, 2017 Author Share Posted January 13, 2017 Does there NEED to be any Back Pressure for the O2 sensor to operate properly? Clean Cat and Straight Piped! Quote Link to comment Share on other sites More sharing options...
DaveT Posted January 13, 2017 Share Posted January 13, 2017 Back pressure not requited. All the O2 does is adjust the fuel mixture, once the engine is up to normal operating temperature. Quote Link to comment Share on other sites More sharing options...
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