* Exhaust Gas Temperature (EGT) Sensor: This is *not* always present, especially on passenger vehicles. It's more common on trucks and larger vehicles. If present, it measures the temperature of the exhaust gases leaving the cylinder head.
* Intake Air Temperature (IAT) Sensor: While often found in the intake manifold, some variations placed it on the cylinder head near the intake. This sensor measures the temperature of the air entering the engine.
* Oxygen Sensor(s) (O2 Sensor): Although usually located in the exhaust manifold *after* the cylinder heads, sometimes the pre-cat O2 sensor could be very close, giving the appearance of being on the head.
It's impossible to say definitively which sensor(s) *are* on your specific 1994 5.7L 350 cylinder head without:
* Visual inspection: The best way is to look at the cylinder heads themselves.
* Checking the engine wiring diagram: Your owner's manual or a repair manual specific to your vehicle year and engine will have a diagram showing sensor locations.
* Checking the parts diagrams: Online auto parts stores (like AutoZone, Advance Auto Parts, etc.) allow you to select your vehicle and view parts diagrams.
Therefore, providing a picture of the cylinder head or finding the relevant documentation is crucial to accurately identify any sensors located there.
