Where is the EGR vacuum on camaro z28 1994?

The 1994 Camaro Z28's EGR vacuum source isn't a single, easily identifiable point like a dedicated port. Instead, it's controlled by the EGR valve itself and the computer (PCM). The vacuum signal is routed *through* the EGR valve, and the PCM manages it based on engine conditions. You won't find a labeled "EGR vacuum" port.

To diagnose EGR vacuum issues, you'll need to:

1. Check the EGR valve itself: Look for vacuum lines connected to it. There will likely be a vacuum line going to the EGR valve from the intake manifold (often a small port or nipple near the throttle body) and possibly another line from the EGR valve to another component within the intake system or vacuum tree. Inspect these lines for cracks, leaks, or disconnections.

2. Inspect the vacuum system: A faulty vacuum source in the overall system could also impact the EGR function. This includes checking vacuum lines connected to the EGR valve and the rest of the vacuum system on the engine.

3. Diagnose using a vacuum gauge: Measuring the vacuum signal at the EGR valve during operation will help determine if the correct vacuum is being applied and if there is any loss.

4. Use a scan tool: A scan tool capable of reading OBD-II data can show whether the PCM is commanding the EGR valve to open or close, helping isolate if the problem is a vacuum leak, the EGR valve itself, or the PCM.

In short, there isn't a single "EGR vacuum" location; you need to trace the lines connected to the EGR valve itself. A shop manual specific to a 1994 Camaro Z28 will be extremely helpful for this diagnosis.