rotaryaddiction

Hello rx7club.com i am finishing up the s4 13b swap into my 84 gs.
Right now I have spark coming from the 2nd gen coils. i have installed the 2nd gen pump in my tank, I have good fuel pressure, The ECU is an n327 (if that helps)
and the ecu has power and gets signal from the cas (Of course to have spark)
My problem is Iam not getting any power to the bronze terminal of the afm connector. I know there was power there when it was in my 86 gxl.
There is no power goint to the right side harness of the car.
If i pour fuel in the Throttle body it will start idle and die.
I have noticed I only have spark when i hook the start wire from the ecu i think it is r/y. should the b/r i think its either shift up light wire or goes to the circuit openeing relay from the fuel pump be connected ?? it wasnt covered in my fsm or i overlooked it but now iam stumped ohh i also do have an n326 ecu is there any diff.

THanks rotary addiction pm me please

CRXtoRX7

I have the same problem, sortof. I have to pour fuel in my throttle body for the car to start (s5 TII). The problem is in the afm. The afm activates the fuel system when you start the car. On mine, someone has to push in the AFM while I crank in order for it to start.

HAILERS

If you have spark it ALMOST follows that you should have injector pulsing.

While you say you have fuel pressue, is it possible that you have the fuel feed and fuel return lines on backwards? It takes but moments to swap the two lines. The fuel lines on a JSPEC engine are opposite of the USA version if that helps.

So, you have the emissions harness from a series four car going to the afm or???????????

You say you have fuel pressure. How much pressure? If the lines are on right the pressue will be in the 40psi range. IF the lines are on backwards I'd suspect the pressure will be in the 80psi range because there will be no continuous flow of fuel through the rails.

ironpanther

Hey ahilers I have spark and pressure and the fuel lines are properly attached but I have no power to my injectors. I have read through alot of what you have posted and was wondering what would cause all four of my injectors to not have power. I tested from the injector plug to ground with the key on.

HAILERS

No power to the injectors? If you pull the smallest plug off the ECU, and look at the injector pins in the PLUG , NOT THE ECU'S JACK, do you have 12v on them or not. I'm not interested in the clips on the injectors, just the power at the smallest plug on the ECU. The wire colors should be as shown in the attached jpg (I hope it arrives).

One wire is light green....another light green/white.......another light green/red .....and the last light green/black. Pins are called out on the dwg.

Key has to be to ON. No cranking required. They should all have batt voltage. If you don't have batt voltage there, uhhhhhhh, errrrrr, aahhh, write back and we'll have some hoops for you to jump through.

You KNOW the voltage originates NOT at the ECU but the Main Relay, goes thru the injectors and the ECU puts the ground on them to pulse them. YES. I'm having a problem figuring what harness your using. It matters. Year of harness also. Got a solenoid resistor??????????????????

N1XRR

Hailers,
I am also having this exact problem in a TII in a N/A swap that I'm doing. No +12v to any of the injectors, but I suspect I have a problem with my wiring harness. The harness does not have the plug for the resistor pack, yet came from an '87 TII. Also, the injector clips have the polarization plug in the center, not offset like the '88 cars. The harness did come from an '87, as did the ECU, but I was not able to get the injectors from the previous owner of the car. The ECU is a N332, which came with the parts car. Like I said, there is no plug for a resistor pack, and I am using high-impedence injectors (with the polarization plug filed down to fit in the injector plugs.)

I am also getting spark. I can turn the CAS by hand and I get nice sparks from the plugs. I have a factory service manual sitting in front of me, but its for an '87 w/resistor pack.

ironpanther

the only plug pin that has voltage is 3A which has 12v. nothing else.

ironpanther

the car is a 88 NA s4.

HAILERS

Both ya alls cars seem to be high impedence versions without the solenoid resistor outfit. We know that the 12v to the injectors comes off the Main Relay. This laptop I'm writhing on does not have access to the 88fsm wiring diagrams so I'll take a look later at the wiring diagrams on the other computer.

I'm also at a disadvantage here because I've never touched a high impedence car and don't personally know what they did in place of the solnenoid resistor package on those later cars. Maybe later or someone else with personal experiece can pipe in.
There should be a black/yellow wire out there looking for an injector. Just don't know right now where in the harness it is.

ironpanther

the black/yellow is supposed to be the wire from the main relay to the injectors.

HAILERS

Ok. I am attaching a bunch of high impedence wiring diagrams. One shows how the injectors get fed from a Black/Yellow wire from connector FEM=02.

There is another jpg showing where FEM-02 is in the car.

Another jpg shows what the plug should look like and the wire colors in each hole. B/Y is what your interested in.

I looked at the low impedence diagram and on those cars the same plug feeds the injectors but passes thru the solenoid resistor package first. Something you guys don't have. I attached a jpg of what that plug should look like and the wire colors in each pin. Black/Yellow are the ones your looking for.

Remember, the EMISSIONS HARNESS is the harness that goes to the injectors, solenoids etc. The FRONT harness is what the EMISSION HARNESS connects to under the dash area where the passengers feet are (above the feet and fwd).

And you know that next to the plugs in the jpg, you see EM next to one half of the plugs and F next to the other half. You know what EM and F stand for. So take that into account.

And you notice the last jpg is of a low impedence plug. Notice how some of the colors in the pins differ from the high impedence FEM-02?

BOTTOM LINE: THE BLACK/YELLOW wires in the FEM-02 PLUG FEED THE INJECTORS. The 12v comes in on the F harness and passes on to the EM harness. Black/Yellow wires in each plug, F and EM.

ironpanther

I already tested the black yellow comign in and out of fem 02 and there is 12v there but not at the injectors. Also checked continuity between injector plugs on the b/y side and there was none.

HAILERS

Ironpanther....you know up from down, so I'm not helping much. You've 12v on the black/yellow coming from the main relay, but on the emissions side of the harness the black/yellow won't even ohm out to the injectors.

Since it's a 86harness, I can't help but think somehow you forgot to connect the solenoid resistor package to the emissions harness. That's the only explanation that makes sense. Solenoid resistor package was that aluminum shield covered device that was about a foot below the original afm. It has one very large plug on it. I'll jpg a picture later.

If its in place, then I'd pull its plug off and see if there's 12v on its black/yellow wire.

HAILERS

Do the injector plugs each have a black/yellow wire on them? Meaning it's a high impedence harness and the post just before this one isn't valid because then there won't be a solenoid resistor. But if it were a high impedence harness, then it just does not make sense that you can't ohm b/t one injectors black/yellow and another injectors black/yellow. Which is the reason I wrote the post above thinking it must be a low impedence harness with a solenoid resistor missing.

This emissions harness came out of the 86 car?

HAILERS

You need to find that plug we're calling FEM-02 and disconnect it from the emissions harness. Find the black/yellow wires in the front harness side of that plug and see if there is 12v when the key is to ON. That plug FEM-02 is in the passengers side of the car, up and toward where the harness goes thru the engine bulkhead.

That black/yellow wire is the same one that is feeding your coils. Your coils are firing from what you wrote so I assume the main relay is good and working.

HAILERS

[QUOTE=ironpanther]the only plug pin that has voltage is 3A which has 12v. nothing else.[/QUOTE\\

Wait a moment. 3A is a ground wire and you have 12v?

Just in case, you count the sockets/pins by looking at the side of the plug that has the wires, and you count from the far right to the left in a up/down method

ironpanther

If I'm looking at the plug side of the connector that plugs into the ecu(as compared with the wire input side) then the top right port is 3a if I am reading the plug diagram correctly. This port would correspond to the top row farthes left hand pin on the ecu if you were looking at the ecu pins pointing at you.

ironpanther

the car is an 88 and the 88 diagrams show a high impedence setup. I am going to chase the wires back from the injector jacks to look for cold solder joints or line breaks some where between fem 02 and the plugs.

For anybody trying to figure out which jack FEM 02 is in an 88 it is the yellow thirteen port jack on the passenger side door side kick panel. There are three jacks on a bundle and they are held recessed into the side of the vehicle with a ten mm nut that you have to remove in order to pull the jack out to a point where you can more easily work with it. The two wires you are most concerned about will be the second row of pins if you are counting near to far from the passenger compartment to the outside of the car with the jack in it's normal position. Those should both exhibit battery voltage.

HAILERS

If you are looking straight at the ECU's jacks with no plug attached..........the FAR RIGHT TOP is pin 3A. The one below is pin 3B. You count from Right to Left. What you wrote is...backwards. That explains why you saw voltage on pin *3A*(of the plug).

I probably read what you wrote wrong, and if I did, just ignore what I just wrote. What I did write is the way things are though. No ifs ands or buts.

All the plugs are read and shown as if you are looking into the WIRE side of that plug. The lowest number wire will be to your far right/top.

It's really, really, really weird that you can't read black/yellow from that interior plug to each injectors black/yellow.

HAILERS

Attached is a jpg of that plug and where the two black/yellow come together in the EMISSIONS side of that connection. I've no idea where that wire splits off into four. Probably in the area of the harness where the old solenoid resistor was on earlier cars.

Maybe the Little Jimmy ******** that owned tha car prior to you just pulled on that harness without disconnecting it? Probably. That might have broken that splice or some wires.

ironpanther

yeah the fsm doesn't do a great job of explaining the orientation of the diagrams. Anyways I will post up what I find in a little while.

cezonetheillest

i remeber that i had the same problem with my tII swap and all it turned out to be was the 15 amp engine fuse on the driverside kick panel. just my 2 cents. i just read through the thread quick but i don't remeber seeing anyone asking about fuses.

HAILERS

A good thought. I didn't say anything becaue I think he said he had 12 on the black/yellow wire at the FEM02 front harness connector meaning the MAIN RELAY was pulled in, which normally requires the ENGINE FUSE to be installed and good. Also he would not have spark if that fuse was bad.

ironpanther

yeah no mention has been made about the fuses because that was one of the simple checks I did first.

ironpanther

So I finally chased down the power lines from the injectors back and found that all four run to a connector that the black yellow from FEM-02 comes into. Only problem is they are all wired into the same side of the connector and I can't seem to find the other side. Is this where that resistor pack you mentioned earlier would reside Hailer? It is no where in the wiring schematic.