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Stesso

Diagnosing Engine Timing and Fuel Delivery Issues

3:44
25:38
47.4K views

At 3:44 in

Turbo LS Horsepower Test! E85 Ethanol vs Pump 93 Octane (What's The REAL WORLD HP Difference?)

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What happens here

Following the disappointing initial dyno run, the tuner (John) pulls the car off the dynamometer to investigate the misfire. He suspects the engine is pulling a lot of timing. Upon inspection with a flashlight, it's discovered that the knock sensor connector, which relays important engine timing data, is unplugged. This explains why the engine was prematurely retarding timing, leading to a significant loss of power. The connector is re-attached, and the tuner also suspects the factory fuel pressure regulator might be struggling to keep up with the increased fuel demand of E85.

Goal: Identify and correct the cause of power loss and inconsistent performance.

Tools and materials

  • Factory Fuel Pressure Regulator — Controlling fuel pressure (suspected of being inadequate)
  • Flashlight — Inspecting engine connections
  • Knock Sensor — Engine timing input (was unplugged)

What they say

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about to take bobby the soccer practice what was that about to take reese bobby yeah john says tanner looks at home in there tanner's daughter's name is reese and you know i started calling her rhys bobby reese bobby's him you know she just wants to go fast he's gonna laugh i don't know what's going on right now momentary break oh man what did it do it sounded like a full pull that time what is it why is this what did we do it's smoking but how much power did it make 455. okay now we figure out why it's making smoke oh is it the oil from the oil that ashton missed yeah yeah see that's why i wanted a damn funnel i didn't spill it though until you started talking about chinese

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