kungfubratt

I can get the car(86,n/a,5spd) to run temporaily by spraying starter fluid in the afm
I checked the main relay's,solenoid resistor,main egi relay,fuse's, fuel pump. I am not getting any power to the injectors. any sugestions? thankz

Syonyk

What's the history of this? I spent a few months trying (not very hard, mind you) to get a FC started. Turns out all 4 injectors were totally gummed up and not firing at all.

If you turn the ignition on and spin the crank angle sensor (either pull it, which is a pain due to having to retime the engine when you put it back in, or use your spare one), you should hear the fuel injectors clicking. It's a pretty loud snap as they cycle.

-=Russ=-

kungfubratt

I put a test ligt on the connector and cranked the motor over, no current. is this the wrong method to check for power?

Syonyk

... what connector?

There should be +12v on on side of the injector connection, the other side is a switched ground at the ECU used to drive the injectors.

-=Russ=-

matts86fc3s

yeah it wont work like that. it sends power in very very fast pulses to the injectors a test light cannot light up and off quick enough to pick it up... and l.e.d. light maybe... i dunno. just turn the ignition on (dont start the car) and you should hear the injectors clicking

HAILERS

ON a 86 you have a thing called a Solenoid Resistor Package. It is located about a foot below the afm/air filter, It has a aluminum cover on it. It has one large electrical plug. It has five wires in it. The wire in the middle feeds the injectors. It is black/yellow in color. It gets fed from the main relay by the same wire that feeds your WORKING coils.

You NEED a digital meter, even a twenty buck one from RS. Check for 12vdc on the black/yellow wire I described above. The other possibility is that you have disconnected one of the plugs that interfaces the Front harness with the Emissions harness. If you have not been playing with the harnesses, then forget that idea.

And Matt86..........the injectors done operate unless the key is to ON and the engine is turning over. No turn over of the engine.......no injector action. Injectors and spark, work off the signal from the CAS to the ECU. If you have spark, and he does because the engine fires with starter fluid, then you should have injector action.

If you hear clicking action with the key to just ON, it is the bac making that noise, not fuel injectors.

n/a-luvr

There is a little square black condensor bolted underneath the trailing coil pack - unplug it's single connector and try to start. ~rich

HAILERS

Do as you please, but............that makes NO sense. Think about it, please. He said the car starts with starter fluid. That means the coils work just fine and the condenser isn't pulling down the voltage to the coils or the fuel injectors. 'The fuel injectors operate when the ECU gets the signal from the CAS to operate them. It, the ECU , pulses a ground to the injectors from the ECU.

n/a-luvr

It sounds like he has what happened to me and it must make sense cause that's what fixed my problem. Look on the wiring diagram, f43 is the only thing between the the ignitors and the fuel injectors on that circuit. So either he has broken power wires to the fuel injectors, or the condensor is bleeding to ground thereby allowing the ignitors to have power but not the injectors.

Besides, it's not gonna hurt the engine if he does. Take him 5 secs to do. ~rich

HAILERS

********* or the condensor is bleeding to ground thereby allowing the ignitors to have power but not the injectors.************

Sorry, but IMHO life does not work like that. I'll just let it go at that.

kungfubratt

nothing from blk/y wire. when I put power to this wire lots of clicking started. Harnesses were messed with by previous owner.

kungfubratt

used a spare crank angle sensor, no injector sounds only clicking from the main fuse box under the hood.

HAILERS

OK. You said you had fire from the spark plugs.....I think.

The black/yellow wire that leaves the Main Relay in the Front harness, feeds the coils (got pwr there since you have spark) and it goes to a plug that interfaces with the Emission harness inside the car. That plug has a reference designator of either X-15 or X-16.

The power continues on a black/yellow wire in the emissions harness and ends up at the Solenoid REsistor Package. That's from memory for a low resistance, 1986 car.

So, I think you said you had no 12vdc at the soleniod resitor plug. That to me means that the plug X-15 or X-16 is disconnected or????? You need to find that plug. Odd you had no power there but got clicking when you put 12vdc to that wire. Odd. Real odd.

That plug is on the passenger side. Way above his right foot and to the far right and forward. Seems it's a large plug of about 14 or so pins. I've no book in front of me right now.

HAILERS

Just where did you put power to the black/yellow wire?????????

Go to this thread and look at the second page. I put two jps of schematics for the fuel injector plugs there. https://www.rx7club.com/forum/showth...black%2Fyellow

https://www.rx7club.com/forum/attach...hmentid=142633

https://www.rx7club.com/forum/attach...hmentid=142634

Find the B/Y wire at the Main Relay. Follow it. It will go to the second jpg down at the bottom of that jpg, and feed the Solenoid REsistor.

https://www.rx7club.com/forum/attach...hmentid=142635 the center pin should have 12vdc on this plug. The Harness side of the plug that is.

https://www.rx7club.com/forum/attach...hmentid=142628

And by looking at the first jpg I see the plug is the one called X-16.

The plug looks SIMILAR to this plug: https://www.rx7club.com/forum/attach...hmentid=132796

X-16 is a fourteen pin connector. See here: https://www.rx7club.com/forum/attach...hmentid=142663

kungfubratt

I have no power going to any of the wires(harness side) of the solenoid resistor. I found a relay near the ecu under the dash ,pass. compartment kick panel.It has 5 wires going to it of which the blk/wht is one of. The problem that I see w/this relay is that one of the wires ,brn, is NOT going to another prong. I have,not yet found what this relay is. There is also a connector ,same area, that looks like the one you have that says "the plug looks SIMILAR to this plug" I can not find the hook up for this plug.lots of green wires. I might junk the whole injection thing and go with the holley set up from racing beat and be done with this nightmare, what do you think? car is clean and worth keeping and smog is not an issue. Thankz P.S. Do you know if the racing beat header is a bolt on system?