Thanks for the great explanation mattsooty!. On a system with both narrowband primary and secondary O2 sensors as on the earlier models the secondary O2 is strictly for converter efficiency, monitoring the converters ability to store oxygen. It has no role in fuel trim adjustment, no?
I am familiar with injector dead time compensation. Do you know if its normal for PCM to stop controlling the alternator and solely depend on battery voltage during high loads, is this a generic method on all FI systems or does it depend on manufacturer?
I have been noticing that on some fuel injected vehicles the voltage drops to battery voltage 12.x-12.6 volts during wot operation. Does the pcm stop fielding the regulator during wot? Maybe you know something I don't?
The reason the 02 signal cycles up and down is because of fuel trim in closed loop operation. When the input signal is high (rich) to the pcm, the injector on time is decreased therefore the 02 signal falls back down and this ongoing cycle continues. The fuel trim is indirectly controlling the...
During Clear Flood operation injectors are turned off when a high a TP signal is detected by the pcm in ignition on engine off state. My question is how long are the injectors turned off for? or are they off until a threshold of xxx engine RPM is reached?
I don't feel like taking the rail off...
On another forum I regularly visit I came across an interesting thread, when replacing the catalyst for a less restrictive hollow test pipe will increase or reduce mpg?. So which one is it, I am curious to hear your answers. Thanks
