Before anyone mentions the obvious, we’ve already replaced the fuel pressure regulator and injectors. We also tested the injection pulses with a beeper light. For some reason, this 5.3L engine is getting so much fuel that it’s hydrolocked on gasoline while cranking, twice. It barely ran once, but then hydrolocked again while running.
We inspected the engine today with a borescope: cylinders 2 and 8 had some weird spots, while cylinders 4 and 6 are perfectly clean. Cylinders 1, 3, and 5 are extremely oily, but cylinder 7 is clean. Does anyone have any ideas? I’m thinking it might be excessive blow-by due to bad rings, leading to oil consumption, misfiring, and then fuel flooding.
1 Like
The issue might be the fuel pressure regulator. It might be leaking fuel.
1 Like
I had a similar issue years ago where water was getting into one of the cylinders. Turned out to be a blown head gasket.
1 Like
It’s possible that you have a stuck injector or injectors. You can hook up a fuel pressure tester to check if you’re losing pressure with the key turned on.
1 Like
You might want to perform a leak-down test. However, we’ve already replaced all 8 injectors with new ones after testing the old ones, which did show leaks on the tester.
1 Like
That does sound like a potential head gasket issue. If you’re experiencing symptoms like coolant mixing with oil, white smoke from the exhaust, or a loss of coolant with no visible leaks, a blown head gasket could be the culprit. It’s important to get it checked out and repaired as soon as possible to avoid further engine damage.
1 Like