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  • #

    Injector firing order

4

8

I N J E C T O R _ F I R I N G _ O R D E R

1

3

7

2

6

5

EXHAUST PULSE DELAY # in Engine Revolutions This is the amount of time in engine revolutions that it takes the exhaust charge to reach the oxygen sensor after ignition. Increase this value to improve idle on cars with long tube headers. _ _

Here is a more specific definition contributed from a someone in the EEC-EFI mailing list: “EXHAUST_PULSE_DELAY is the time between when the injector

pulse width is calculated in the EEC (*not* when the injector is fired), to when that pulse ends up reliably sensed at the HEGO sensor. This is used to predict when the O2 signal will cross so it can get the correct amplitude and bias results.”

Load (VE)

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From an EEC Tuner user point of view, longer headers mean larger values in the table. Conceivably, changing the injector timing table could also have any effect here (I would presume only a negligible one though < 1).

RPM

HEGO_AMPLITUDE

Description taken from an EEC-EFI mailing list contributor:

“ HEGO_AMPLITUDE is the desired amplitude of the O2 dither signal. This is modified primarily for emissions - it is set up to optimize the catalytic converter performance. A certain minimum is required to maintain the system in a limit cycle oscillation.”

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