I was looking at the fuel injection schematics of my early 90’s Toyota Corolla with electronic fuel injection, and it appears all 4 of the injectors are controlled by the same electrical signal. I would have guessed the injectors would time their injection with the valves, but it appears they si…

If this is a multi port system, they should fire independently. Not all at once, unless it’s a throttle body set up (but usually they only have two injectors). You must be reading it wrong??

There’s definitely four separate injectors, an injector situated in the head near each intake valve.

Well, Bosch had CIS (continuous injection system) that injected a modulated stream of gas continuously, maybe this is something like that. The amount of fuel injected was proportional to the total air flow, with no on/off.

Each injector has a common power supply like a string of Christmas tree lights. The computer has what are drivers for each injector. The drivers in the computer grounds each injector at the appropriate time to fire them individually. Tester

I had a 1994 Saturn SL-2 that had multi-port fuel injection, and the injectors all fired simultaneously. The next year they went to a sequential fuel injection as part of an engine quieting revamp. I suspect port fuel injection without the sequential firing may have been somewhat common in 1990 wh…

During this period, car makers were doing everything they could to avoid paying Bosch licensing fees. Bosch held the patents on most of the injection designs…GM was pretty proud of their TBI system which did not infringe on Bosch patents and worked well from a cost and emissions standpoint…Honda got…

A quick look at some schematics (keeping in mind I’m no Toyota wiring expert and there may be something missing in the diagrams) shows several different methods of injector wiring up through '95. They all have a common power source and ground is made through the ECM either with one lead or a pair of…

Here’s the schematic. What do you think? Do all 4 injectors fire simultaneously?

Yes. That’s not unusual for a car of that era. Most V6 engines of that time fired all the left injectors simultaneously and all the right injectors simultaneously. The old Ford 4.9 inline 6 fired the front 3 and the back three. Some Ford V8s fired 2 left and 2 right simultaneously. Technology for pr…

Do all 4 fuel injectors inject fuel simultaneously?

Maintenance/Repairs

FoDaddy July 8, 2012, 7:15am 9

Multiport fuel injection isn’t necessarily the same a sequential fuel injection. It’s entirely possible to have an engine with individual fuel injectors that fire one entire bank at a time; it’s called batch fire IIRC. I know some Fords had it in the late mid-late 80’s. As for your specific car, I couldn’t tell you.

Topic		Replies	Views
Part identification Maintenance/Repairs	6	817	November 21, 2021
When did F.I. start Maintenance/Repairs dodge , ram , 2500	12	1175	February 12, 2010
Only half the injectors are working on a 8 cylinder ford E350 Maintenance/Repairs ford , f350	2	9636	September 28, 2010
Injector problem? Maintenance/Repairs	9	1528	December 30, 2015
Major injector/ECU/fuel problems Power/Fuel oldsmobile , cutlass	50	27798	September 1, 2016

Do all 4 fuel injectors inject fuel simultaneously?

Related topics