Car Jerking when Accelerating

[Monkman33]

Originally Posted by powerhouse

Lets get the monkey on the right banana tree.
1. Run out of gas, NO detonation.
2. Run on lean gas, "Kaboom"

Run out of gas at low RPM . a possible sputter before you stall.
Run out of gas at high RPM. burrrrrrrrrrrrrr if you know what i mean.

Problem with your "run out of gas" issue:
You never go from full pressure and proper AFR's to zero fuel within a millisecond. you get air in the lines as the pump runs out of fuel to pressurize the system. As the pressure drops, your injector pulse-widths stay the same. Thus injecting a leaner mixture, which can cause detonation if it gets too lean. Then as the pressure keeps dropping or fluctuating depending on where the remaining fuel in the tank is being moved to (based on the movement of the vehicle) the car will run worse and worse. Again, not enough pressure means less fuel, means leaner AFR's, means higher chance of detonation.

That is the problem with fuel starvation... you never JUST run out.