Question about 1993 Subaru Impreza
I don't know how to turn up the fuel flow rate by using the coolant temperature sensor. Are there any answers for this question?
This is my thoughts on the matter .. A cooler engine requires more fuel . So If your running a cooler thermostat or keeping the engine running cooler its going to call for some more fuel than an engine that is running at a higher temp.. Does your car have an adjustable fan or are you saying it has an adjustable temperature sensor ? thanks and holler if you need any more Jerry
Posted on Apr 22, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Inspect vacuum hoses for splits, kinks, and proper connections, as shown on Vehicle Emission Control Information label. Inspect thoroughly for any type of leak or restriction.
Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking, especially between the mass air flow (MAF) sensor and the throttle body.
Inspect for air leaks at throttle body mounting area, mass air flow (MAF) sensor and intake manifold sealing surfaces.
Inspect the wiring harness for poor connections, pinches, cuts, or other damage.
Inspect for loose, damaged, or missing sensors and/or components.
Really need to check sensor PID'S with a scan tool, An maybe a scope too ! PID'S are parameter identification . All the sensors operate within a set voltage parameter , like the coolant temp. sensor an if it's off it can affect fuel delivery !
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The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.
The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.
The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.
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