The throttle position switch IS the idle signal. The afr and also the timing are a function of it. That's why you disconnect it when setting the timing.
Sup, have you set the timing with the TPS disconnected?
crowbar wrote: The throttle position switch IS the idle signal. The afr and also the timing are a function of it. That's why you disconnect it when setting the timing.
Sup, have you set the timing with the TPS disconnected?
Really, on what years all of them? We set the timing with everything hooked up...
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crowbar wrote: The throttle position switch IS the idle signal. The afr and also the timing are a function of it. That's why you disconnect it when setting the timing.
Sup, have you set the timing with the TPS disconnected?
please take your bad info to nissanforums or zcar or some other site where you wont waste our time. there are about 20 variables that affect AFR at any given engine speed.
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Well 'we' are not discussing 'any given engine speed'. We are discussing idle. And the AFR at idle to be specific.
The idle switch condition is THE signal that tells the car it is at idle, and what AFR and timing to use.
The technician only looks for O2 signals (mode 1) with the TPS attached. The field shop manual DOES differentiate between the AFR test at idle because it instructs that technician to disconnect the TPS before checking mode 2 afr. This is called out in the Mixture Ratio Feedback System Inspection in the EFEC chapter.
In other words, the car when at idle, uses a different afr than when it is not at idle.
I also believe when adjusting the MAF, the TPS is disconnected also.
As far as the timing, many aftermarket manuals call out disconnecting the TPS. This may be incorrect. The FSM calls out disconnecting the idle up solenoid only before setting the timing (vg30e). If this actually moves the timing would be the issue.
I would think that the leaner you could go, the better... as long as it idles how you want it to.
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I dont know. Hell, that reminds me I ought to reset it considering my cas went bad the other day. Its late and my car is too loud to be goofin around with right now. I dont want to bother the neighbors.
Go tinker with yours.
crowbar wrote: Well 'we' are not discussing 'any given engine speed'. We are discussing idle. And the AFR at idle to be specific.
The idle switch condition is THE signal that tells the car it is at idle, and what AFR and timing to use.
The technician only looks for O2 signals (mode 1) with the TPS attached. The field shop manual DOES differentiate between the AFR test at idle because it instructs that technician to disconnect the TPS before checking mode 2 afr. This is called out in the Mixture Ratio Feedback System Inspection in the EFEC chapter.
In other words, the car when at idle, uses a different afr than when it is not at idle.
I also believe when adjusting the MAF, the TPS is disconnected also.
As far as the timing, many aftermarket manuals call out disconnecting the TPS. This may be incorrect. The FSM calls out disconnecting the idle up solenoid only before setting the timing (vg30e). If this actually moves the timing would be the issue.
are you saying that you will see the same afr with 38psi of fuel pressure that you will with 100psi?
same afr if injectors are sticking?
same afr with 300 duration cam lobes?
i could go on...
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