Jaguar XKR P0300 P1316 Random Misfire— Bore Scopes Compression Testing (Episode 7)

The diagnostic deep dive goes even deeper.

In the last episode, we systematically hunted for vacuum leaks using a smoke test to address that stubborn Bank 1 misfire. While we’re narrowing down the external culprits, it’s time to face the question every owner of a high-performance V8 fears: is the issue mechanical?

In this episode, we move from the intake and sensors to the literal heart of the engine. To rule out catastrophic failure or internal wear, we’re getting eyes inside the cylinders and pressure-testing the health of the V8.

This is where we find out if we’re fixing a misfire or rebuilding an engine.

We explore:

Borescope Inspection: We’re dropping the camera into the combustion chambers to hunt for carbon buildup, piston damage, and any signs of scoring on the cylinder walls.

Compression Testing: The ultimate health check. We’re looking for consistency across both banks to ensure the rings and valves are still doing their job.

Reading the Data: What the relationship between physical cylinder health and our Bank 1 misfire codes actually tells us.

The "What Next": Determining if our diagnostic path stays on fueling and ignition, or if the Jaguar is headed for a much more serious teardown.

This isn't about throwing parts at a problem; it’s about verifying the foundation. If the compression isn't there, the best injectors in the world won't save us. It’s time to see what’s really happening inside this V8.

Bore Scope https://www.amazon.co.uk/dp/B0DMK6P7V5

🔧 Subscribe and follow along as we continue the methodical pursuit of bringing this XKR back to its former glory.

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