Injector Firing

[Andrew F. Gunnesch]

On Dec 23,  4:59pm, bruce plecan wrote:
> Subject: Re: Injector Firing
> On a GM ECM, like what is used on the 87-89 camaros (TPI) they have the
> injectors wired into two groups of four.  Would that mean they alternate
> firing each group every 90 degrees?,  180 degrees?  360?.
>
> On the TBI's they fire in synch with the cylinders only at low fuel demand
> periods, right?.
>
> Do they do the same thing with the batch fired TPI's?.

I believe that they wire them to fire every 90 degrees since the injectors
are fused per bank... you lose one bank, you can still limp home with the
engine firing every 180 degrees.