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 MANUALSFORD1987TEMPO FWD L4-140 2.3L HSCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBAROMETRIC PRESSURE SWITCHDESCRIPTION AND OPERATION
1987 Ford Tempo FWD L4-140 2.3L HSC
Barometric Pressure Switch: Description and Operation
1987 Ford Tempo FWD L4-140 2.3L HSCSECTION Description and Operation
Fig. 15 Ignition barometric pressure switch:
This switch, Fig. 15, controls spark timing and/or other electrical devices according to altitude. Calibration resistors in the switch assembly cause the ignition module to vary the spark timing. Spark timing is advanced for vehicle operation above a predetermined altitude and retarded for vehicle operation below a predetermined altitude. Some switch assemblies control both spark timing and another device while other switch assemblies control only one or the other.
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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.