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 MANUALSCHEVROLET1986CAPRICE WAGON V8-307 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBAROMETRIC PRESSURE SENSORTESTING AND INSPECTION
1986 Chevrolet Caprice Wagon V8-307 5.0L
Barometric Pressure Sensor: Testing and Inspection
1986 Chevrolet Caprice Wagon V8-307 5.0LSECTION Testing and Inspection
- Chart C-1D Map or Baro Output Check.:
- Wiring Diagram for Chart C-1D Map Output Check.:
CHART C-1D, MAP AND BARO CHECK
CHART DESCRIPTION
1. This checks the sensor voltage, which is highest when manifold pressure is highest. Output normally is in the middle range for specific altitudes.
Low voltage increases spark advance. High voltage decreases spark advance.
MAP and BARO sensors are essentially the same device. One measures pressure in the manifold and the other the pressure of the atmosphere.
2. This checks to see if the rate of change of the output vs. change in pressure is correct. Again,the normal change would be about the middle of the range listed. The voltage should change as soon as the vacuum is changed. If it doesn't, it could result in detonation or a sag on acceleration. It could also be caused by fuel or a restriction in the hose to the sensor.
RENDER: 1.0x
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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.