20-06-13, 07:21 PM
The ignitor controls the code setting.
TPS is used to fine tune the ignition timing. The ignitor controls the ignition timing and uses the engine speed to set it and TPS to fine tune it.
As the engine speed rises the timing is advanced to allow the fuel air mixture time to burn to ensure peak combustion pressure.
In the older engines the advance was controled mechanical weights and springs using centrigufal force, but spring tension weakened as the engine aged thus giving the incorrect advance.
The engine speed and TPS via the ignitor give better control of the timing for given throttle opening and engine speed and does not have the wear issue of the older system.
That is the short version of why
TPS is used to fine tune the ignition timing. The ignitor controls the ignition timing and uses the engine speed to set it and TPS to fine tune it.
As the engine speed rises the timing is advanced to allow the fuel air mixture time to burn to ensure peak combustion pressure.
In the older engines the advance was controled mechanical weights and springs using centrigufal force, but spring tension weakened as the engine aged thus giving the incorrect advance.
The engine speed and TPS via the ignitor give better control of the timing for given throttle opening and engine speed and does not have the wear issue of the older system.
That is the short version of why