my 75 toyota

Has anyone ever veiw the wiring schematic for a 1988 Toyota pickup with a 22RE engine. It basically shows injectors have a 12+ ignition power wire that splits off pair the injectors #1 and 3 in one group and #2 and 4 in the other coming off of a resister. So the injectors are ground triggered ok now # 1 and 3 share the white wire back to the ECM and the #2 and 4 share the white/red wire to ECM. Now i find a jumper wire from the white wire to the white/ red wire. So if this is correct then all 4 injectors are linked together and run all the time. So would that not cause power and fuel economy loss. what would happen if the jumper was cut to seperate them i wonder. Any ideals on this and yes it came straight from the Toyota repair manual like that.

skypilot

iTrader: (1)

88 is a transition model year. I have two, the injectors are unique to the model year.

my 75 toyota

So ok i did seperate the 2 injector bank wires and the car runs just fine gonna take on a test drive now

sb5walker

Both the 22REs and 3VZEs for all years up to 95 all fire all the injectors simultaneously. Strange, but that's the way they're designed. I think it works out to each injector firing twice for one intake stroke of that injector's cylinder. I don't know why they built it that way; maybe someone around here does(?)

http://www.autoshop101.com/forms/h22.pdf

my 75 toyota

Ok nice find very informative. How ever if you notice the jumper wire connecting no 10 and no 20 on ecu. By doing this it fires all injectors at all times even on a exhaust storke which will ruin a cat convertor would it not.

skypilot

iTrader: (1)

No it would not; Fuel will simply pool at the intake valve, and if that leaks there is pressure on the other side forming a crude EGR function. No raw fuel enters the exhaust stream.

sb5walker

Yeah, the injectors are all in the intake manifold. The extra firing would just create clouds of fuel mist in the manifold, waiting for an intake valve to open and a piston to descend in an intake stroke to suck fuel-air mist into the cylinder, to be compressed, burned, and expelled.

I'm pretty sure the ecu grounds both terminals 10 and 20 at the same time, so cutting the jump wire probably wouldn't change the behavior of any of the injectors. But since the engineers must have had a reason to put the jump wire there, I would leave it.

Buck87

I have been curious about this subject ever since my mechanic discovered that I had one injector not firing so; he piggybacked a wire from another injector to make it work. Tell me more.

sb5walker
thanks for the cool link.

sb5walker

Um. You have nice eyes?

Buck87

Happy Bithday USA