Q about computer advanced timing

[PKRWUD]

That's a tough question to answer. If the spout is plugged in, and the system is in closed loop, the timing mark should be at 10 degrees. That's the ECM's job. As you accelerate the engine, timing will advance according to demand, but there isn't much demand when the car is sitting in your garage, with no load. Odds are that you will see it start to advance, but promptly return to 10 degrees, or at least close to that. The ECM bases it's decision to advance the timing on more than just the signal from the TPS. All that signal tells it is that the driver wants to go faster. If it's BAP or MAP tell it that there is no load, why should it advance the timing?

Hope this helps.

Take care
~Chris

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Retired Moderator
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