R.O.D

iTrader: (3)

anyone got pics on how to do this
or tell me what wire goes to what, engine swap is almost running, think this is the last piece
need an elec. engineer, someone told me about a guy halier... or something.....
its an 86 with an 88 jdm tii engine

somone told me that the inj. from the 88 are high impedance
and that the 86 resistor is for low impedance

i think the reason me car isnt running now that i've worked out EVERY SINGLE BUG
is the the 88 highIMP inj. arnt getting enough volage because of the lowIMP regulator..... makes since right

any helpwould be awesome
thanks

HAILERS

Depends which EM harness you used on the engine.

IF you used the stock 86 EM harness, then you would have the 12vdc on one wire of each injector, if the solenod resistor was connected to the harness.

IF you used the 88 turbo EM harness on the engine.....................................

Tell you what. Just write back and say which harness is on the engine. Is it a JDM harness that came with the engine? Or the stock non turbo 86 harness? Or did you buy a USA 88 turbo harness for the engine?


The power for the injectors comes from one of the EGI fuses in the engine bay fuse box. Make sure they are both good. Then the 12vdc leaves the EGI fuse and goes to the MAIN RELAY. Then on to the injectors.

The MAIN RELAY won't pull in unless the ENGINE fuse in the interior fuse box is good.

The fuse box covers are shown in the FAQ thread at the beginning of this 2nd gen site.

Oh. If you put high impedence injectors in a low impedence car, say a 86 na, they will still work. But at some much later date the *drivers* in the ECU will probably burn out. Much later and only under heavy load. imho.

One way to check the voltage out for the injectors, without tearing the engine up, is to go to the ECU.

R.O.D

iTrader: (3)

the wiring harness is 86 na

the engine is 88Tii jdm with red top injectors(high imp, right?)

R.O.D

iTrader: (3)

by the way my frien mark in tx told me bout u been lookin for u all over the net!! lol

HAILERS

Do you know where the solenoid resistor package is??? It's a foot below the afm/filter assy. It's rectangular in shape and has an aluminum cover on it. It has one elect plug that is round in shape. Is that still on the harness?????

R.O.D

iTrader: (3)

ya it's still conected i was gonna do my own trial and error jumper but i figured i'd try somemore to find u, then u found me ahhhahahhahah

HAILERS

The car should have started with or without that change to the resistor package. Are you getting spark? Fuel? Noises like it's starting?


IF you have a meter, you could pull that big yellow plug off the resistor package, and with the key to ON, check for 12vdc on ONE wire. I forget which one. I'm pretty sure it's in the middle. No 12v means a fuse is blown somewhere or one of the plugs on the EM harness is off. Either at the ECU or one of the large ORANGE looking plugs just the passengers side of the firewall.

R.O.D

iTrader: (3)

ya it starts and runs for a couple sec, then dies

... dont have a volt meter right now, but i can get one tonight

HAILERS

IF you go to the following thread, and go down the page, you will see a jpg of a solenoid resistor and how to make it compatible with the high impedence injectors.

You pull the package off the EM harness. You cut the wires on it in half. You set the package in the closet or doghouse. You keep only the plug so you can reattach it to the harness. You splice all five wires you cut, together and your through. Either solder all five together or if you have a real good set of wire crimpers, you could crimp all five togeher in a butt splice.

https://www.rx7club.com/forum/showthr...oid+resisto r

When you finish, you plug the part in the jpg that is colored in RED, to the harness and your though.
https://www.rx7club.com/forum/attachm...1&d=1173581265

OOPS. I accidently posted this on a ancient thread. Ooops.

R.O.D

iTrader: (3)

this is why ur a f-16 system spec.!!!

thanks!!!!!!!!

HAILERS

Well, you probably do need , at sometime, do that splice job on the resistor package. But right now it sounds like you have fuel because it sputters. So I'd say you have voltage at the injectors for sure. The voltage is at the injectors all the time. The ECU pulsing a ground on the injectors causes them to pulse/open/shut.

One thing to know about RX-7. The afm is not used for STARTING the engine. Fuel delivery is done by a map inside the ECU for STARTING.

After the ECU sees the engine get above 500rpm, THEN the afm is used for fuel delivery.

If the afm plug is left off, and engine will start for a few moments, but won't keep running. So make SURE the AFM's plug is on.

A large air leak would keep it from running. Like the brake booster vacuum line is on the back of the throttle body. If there is no hose going to it, then that would keep it from running.

Or the BAC has a hose from it to the turbo outlet duct. Small in length. Gotta have that on or plugged.

On the back of the turbo inlet duct, there is one large nipple with a BOV (air bypass valve) and that can't be open. Plus there's a silver check valve going in the back of that duct that has to be there or the hole for it covered.

R.O.D

iTrader: (3)

the afm, is good if i put a diffrent one on there ( the one from napa,{DO NOT BUY FC PARTS FROM THEM}) it doesnt try to run at all, while the car is running in that small amount of time, i sprayed starter fluid all over the place for Vac leaks, no leaks

HAILERS

OH. Did you know the JDM engines have the fuel lines backwards vs USA engines????

Pull your return line off the engine. Have someone crank the engine over for a moment. Fuel should come out of the return line on the engine. If not, swap the return line and the feed lines at the engine and try again. That's bitten more than one person in the butt before.