I changed out my injectors for propane, special build to show later... anyway I threw the old rail out and cannot figure out the sequence. Does anyone have the harness labeled with which wire is which? Cyl1 cyl2..... sorry hope someone is smarter than I am😂
[This message has been edited by Napafiero (edited 12-03-2016).]
You'll have a lightgreen/black and pink/white set of wires. Those go to the injectors 2,4, and 6 in any order. The other set of wires should be lightblue/black and pink. Those go to the 1,3, and 5 in any order. They just have to be installed at the correct bank. 1,3 and 5 fires at the same time so order on that side does not matter and 2,4, and 6 fires at the same time so again, order does not matter.
[This message has been edited by IMSA GT (edited 12-03-2016).]
They really don't even need to be on the right bank. Each bank of three injectors are wired to the same port on the ECM. The ECM internally fires the two ports identically and both at the same time. So it really doesn't matter. Now if you lose the INJ1 or the INJ2 fuse, or you lose one of the ports out of the ECM, the engine would run rougher but again it hardly matters. I doubt you could stretch the wires across from one bank to the other.
Thanks! I guess it just doesn't make sense to open all injectors on a bank at once. But I guess im thinking direct injected vs this system, thanks again.
They really don't even need to be on the right bank. Each bank of three injectors are wired to the same port on the ECM. The ECM internally fires the two ports identically and both at the same time. So it really doesn't matter. Now if you lose the INJ1 or the INJ2 fuse, or you lose one of the ports out of the ECM, the engine would run rougher but again it hardly matters. I doubt you could stretch the wires across from one bank to the other.
The fuel injection system in the Fiero V6 is one of the earliest MPFI setups. From an electrical standpoint, it's basically a hacked TBI setup. The TBI setup (in other vehicles with the 2.8 V6) had a throttle body with 2 injectors in it. But in the Fiero, each of the TBI injectors has been replaced with 3 MPFI injectors, wired in parallel. It's a quick and dirty way to get MPFI without having to invent a completely new electronic setup. Since the injectors are wired in parallel, they can't be fired individually. Each bank of 3 injectors has to be fired simultaneously. So there is no "injector firing order" to mess up.
That makes total sense, funny how you have to think backwards to understand something😀
Exactly as above. Fieros use what is called "Batch Fire" fuel injection. It works but it is a crude system very inferior to sequential MPFI. When an injector is triggered, the fuel air charge just sits there until that cylinder is on the intake stroke.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
Fieros use what is called "Batch Fire" fuel injection. When an injector is triggered, the fuel air charge just sits there until that cylinder is on the intake stroke.
When I first discovered that years ago, I couldn't believe it. It seemed so mickey-mouse. It's amazing that it works as well as it does.
If you think this is weird then take a look at mechanical continuous injection systems like Bosch Jetronic stuff used on mostly Mercedes cars up until the early 90s.
Those injectors not only spray all at the same time, they spray ALL the time. No pulsing, just continuous fuel spray like from a garden hose.
If in good condition they run smooth as hell and not get too bad MPG
[This message has been edited by cebix (edited 12-06-2016).]
Exactly as above. Fieros use what is called "Batch Fire" fuel injection. It works but it is a crude system very inferior to sequential MPFI. When an injector is triggered, the fuel air charge just sits there until that cylinder is on the intake stroke.
That's not necessarily a bad thing. Sequential fuel injection can (on purpose) fire an injector at a closed intake valve.
The fuel then vaporises well because it hits a hot valve.
[This message has been edited by pmbrunelle (edited 12-06-2016).]
Sequentially injected engines revert to batch injection at higher RPM. The advantages of sequential injection exist only at lower RPM.
Carburetors aren't sequential and they work.
Throttle body injection is better than a carb. Multiport batch injection is better than throttle body Sequential multiport injection is better than batch multiport Direct (sequential) injection is better than multiport sequential injection
But all still function.
Many of the aftermarket fuel injection kits are only throttle body injection.
It seemed so mickey-mouse. It's amazing that it works as well as it does.
