Inferno451

So i'm wanting to do something about my injectors in my 87' 4runner. As I understand it, the way the early injectors up until mid 88' were low impedance injectors with a "solenoid resistor" (the silver box with fins in the engine compartment) wired in line before the injectors to lower the voltage. The later ones from mid 88' on are high impedance injectors with no resistor inline. I'm wanting to buy the "Flamethrower" 4 hole injectors that people on here have seemed to like. The 88+ injectors are $100 for a set of 4, and the 83-87 ones are twice the price. Seems like the later model injectors can be used if the solenoid resistor is simply bypassed. In fact, there's a vendor that sells a mini harness to do exactly that. Does anyone see a problem with doing this?

Here's a link to the Ebay listing, he also sells high impedance injectors along with this harness.

http://www.ebay.com/itm/Toyota-4runner-Pickup-Celica-22RE-22RTE-Fuel-Injector-Resistor-Box-Delete-Plug-/201027372640?pt=Motors_Car_Truck_Parts_Accessories&hash=item2ece2a4660&vxp=mtr

Terrys87

iTrader: (1)

If you are wanting to intentionally put in the different injectors, they will not interchange as they have fool proff tabs on them. I have the Flamethrowers and they are some great injectors.

If you purchase injectors from him for an 88 model, he will supply an adapter for them. I have always wondered where the resistance difference is at. I know the injectors have a different resistance value but wonder how the computer sees the difference.

As far as I know, the resistor that you are speaking of on the inner fender has the same values on all models that I am aware of. (85-89)

Inferno451

That's odd, I had read the later models didn't even have the resistor. I'll have to email the seller and see if I can get some clarification. I'll measure the resistance on mine when I get home and do some calculating.

Terrys87

iTrader: (1)

In your signature I see you have an 87 Runner so that is what I am assuming. I may be wrong on the 90 and newer model as I have not worked on them in a while. Below is the different styles of injectors. The red ones look the same but the tabs are above or below the injector pins. I forget which is which but a resistance check will let you know which style you have. From looking at different harnesses and such, I am guessing the computer is designed to operate with the different resistance.

In theory the tabs should keep you from getting the two styles of red injectors into the wrong harness.

I have read in the past where someone has done the injector upgrade and if I recall right, they changed to the 89 and up. The clips on 87 and older is a poor design and get brittle. The newer connectors just use a squeeze tab. The newer injectors would be more available as well, but my luck I would try and ruin my computer. Never was brave enough to try something like that.

Copied...
Here are the 3 types of injectors. The white one is 85- 87, the 88 looks just like the 89 and up but the fool proof tabs are different. I dont remember which one is which but 85-87 is 1.5-3.0 Ohms, 88 is 1.0-2.5 Ohms, and the 89 and newer are 13.4-14.2 Ohms. Do a resistance check to see which ones you have.

Inferno451

That's correct, this is for my 87'. Speaking hypothetically here, would the computer even know the difference? As long as the resistance ends up being the same, shouldn't the injector drivers work exactly the same for both? The early models seem to have the high resistance solenoid resistor and then smaller resistance on the injectors themselves, whereas the later ones just have all the resistance on the injectors. Should be the same thing, right? Seems like i could just swap the connectors, bypass the solenoid injector and be G2G.

celica22rte

I've ran 7mgte 420cc injectors on my setup without any problems, all i did was change the injector plugs. I never had problems, I also ran RX7 84-87 650cc injectors. I was running a 22rte computer. I also tried an HKS f-con piggyback, it has 10 adjsutments for duty cycles, never really got that to work right.

Terrys87

iTrader: (1)

I am not sure if it would mess up the computer. It would be nice to know as the 89 and newer would be a better connector and easier to find as there was more years available. Maybe someone can chime in that knows more about electric and what would happen.

RustBucket

iTrader: (1)

I have an 88 and can confirm that I do indeed have an injector resistor (solenoid resistor) and it's the same resistance as one from an 87. I borrowed the 87 one once during a troubleshooting binge.

Inferno451

From what I've read it seems like some 88s were low impedance and some were high impedance like the later ones, but they used a different connector.

wilk913

So for my 87 runner I should get low impedance injectors, will I need plugs as well? Also when should injectors typically be replaced, and how do I tell if they are going bad or dirty etc.?