Where is the knock sensor on a 1987 Chevy Suburban 5.7 engine?

The 1987 Chevy Suburban 5.7L (350 cubic inch) engine's knock sensor location isn't standardized across all production runs. There's a possibility it might not even have one, as knock sensors weren't universally fitted to all vehicles of that year and engine type. GM's approach to knock detection varied.

To find out if yours has one, and where it is if it does:

1. Consult your repair manual: A factory service manual for your specific year and engine will be the most accurate source of information. This will show diagrams and precise locations.

2. Check the engine block: The most common location for a knock sensor on a small-block Chevy of that era is on the driver's side (left side as you're facing the engine) of the engine block, somewhere near the front. It's typically a small, cylindrical sensor with a single wire. Look for a sensor that looks noticeably out of place and isn't readily identifiable as something else.

3. Look for wiring: Follow the wiring harness. The knock sensor will have a single wire leading to a connection point somewhere in the engine compartment wiring. Tracing this wire *backwards* can lead you to the sensor itself.

4. Online forums: Search online forums specific to 1987 Chevy Suburbans or small-block Chevy engines. You might find pictures or discussions from other owners who have located their knock sensor.

Important Note: If you cannot find it, it likely wasn't installed on your particular vehicle. The lack of a knock sensor won't necessarily mean anything is wrong with your engine. It just means the engine's computer relied on other methods to prevent detonation.