Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1985CONQUEST L4-2555CC 2.6L SOHC TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBAROMETRIC PRESSURE SENSORDESCRIPTION AND OPERATION
1985 Plymouth Conquest L4-2555cc 2.6L SOHC Turbo
Barometric Pressure Sensor: Description and Operation
1985 Plymouth Conquest L4-2555cc 2.6L SOHC TurboSECTION Description and Operation
The pressure sensor, installed on the firewall, senses ambient barometric pressure and absolute pressure in the intake manifold. Ambient barometric pressure is sensed by the sensor energizing the solenoid valve by the ECU for a pre-set time period immediately after engine starting and thereafter once every time period. Ambient pressure information is sent to the ECU for controlling fuel delivery time. During times when barometric pressure is not being sensed, the solenoid valve is de-energized and the sensor detects intake manifold pressure. This information is sent to the ECU for controlling fuel delivery time and idle speed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.