no prim. injector signal
03-08-05, 03:03 PM
#1
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no prim. injector signal
I'm having a injector problem. I took out the primary injectors and tested them, they clicked everytime I tried them. I put a little bit of gas into the engine while they were out and it started in literally 1 second of cranking then died when it ran out of gas (about 8secs). I took out my vert ecu and replaced it with my friends 87 TII one and no go. I checked the injector clips before I rewired them and they were not getting any power at all, not even when cranking it. The TII harness I have had extra injector clips spliced into primary clips. I took those off and rewired the original clips to the right wires by crimping them and still no go. The first time I tried starting it with used plugs it would not fire, just flood. Now I have new plugs and it fires but I'm not getting any gas. I crank it over for a couple seconds each time and the plugs don't smell like gas at all. I thinking about just rewiring each injector clip from the ecu clips and hoping this fix's my problem. I hooked up all the grounds that were originally on my car, along with the o-ring ground on the top of the rear housing. Any ideas?
03-08-05, 03:38 PM
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Are you turboing your convertible?
You need to give a little more info in your post.
If you are turboing your Vert, what year engine and harness are you using?
If your using an early 87 engine and harnees then make sure that your injector resistor pack is plugged in. If you are using a later engine then you don't have a resistor pack.
Before rewiring, check for continuity between the injectors clips and the ecu plug using an ohm meter. If there's no continuity then check the resistor pack or look for breaks in the harness.
Rewiring directly from the ecu to the injectors could damage your ecu if you have low impedance injectors since they would need to run through the resistor pack before going to the ecu.
Hope this helps.
You need to give a little more info in your post.
If you are turboing your Vert, what year engine and harness are you using?
If your using an early 87 engine and harnees then make sure that your injector resistor pack is plugged in. If you are using a later engine then you don't have a resistor pack.
Before rewiring, check for continuity between the injectors clips and the ecu plug using an ohm meter. If there's no continuity then check the resistor pack or look for breaks in the harness.
Rewiring directly from the ecu to the injectors could damage your ecu if you have low impedance injectors since they would need to run through the resistor pack before going to the ecu.
Hope this helps.
03-08-05, 03:39 PM
#3
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Did ANY of the injector plugs have battery voltage on one of the two pins on each?
If not, then take a look at the solenoid resistor package under the afm IF you have the early 87turboII. Of the five wires going in the solenoid resistor package, one has 12v. It's a black/yellow wire if I remember right.
If a later 87turboii, you will not have a solenoid resistor package. In that case one pin of each injector plug should have battery voltage on it.
If you don't have battery voltage at each plug, you've got me why you don't. The same black/yellow wire feeds the ignition coils from the MAIN RELAY. So if you have coil voltage (YOU said the car will start), there would have to be a break in the wiring from the main relay to the solenoid resistor IF your car came with one, OR if it did not have a solenoid resistor, then the wire that feeds the four injectors is busted somewhere after feeding the coils. Got me where.
I bet you have battery voltage on one pin of each injector plug.
You know the injectors operate by having 12v on one pin of each injector and the ECU pulses a ground to each injector momemtarily to operate them. Yes.
Is the two wire ring terminal intact on the rear rotor housing. It's about two inches left of bl on the rear rotor housing. Manifold off to see it. That two black wire ring terminal is the ground for the ECU.
Free fsm WITH wiring diagrams, is free for a download from a url on this site. Mazdatrix sells fsm's.
If not, then take a look at the solenoid resistor package under the afm IF you have the early 87turboII. Of the five wires going in the solenoid resistor package, one has 12v. It's a black/yellow wire if I remember right.
If a later 87turboii, you will not have a solenoid resistor package. In that case one pin of each injector plug should have battery voltage on it.
If you don't have battery voltage at each plug, you've got me why you don't. The same black/yellow wire feeds the ignition coils from the MAIN RELAY. So if you have coil voltage (YOU said the car will start), there would have to be a break in the wiring from the main relay to the solenoid resistor IF your car came with one, OR if it did not have a solenoid resistor, then the wire that feeds the four injectors is busted somewhere after feeding the coils. Got me where.
I bet you have battery voltage on one pin of each injector plug.
You know the injectors operate by having 12v on one pin of each injector and the ECU pulses a ground to each injector momemtarily to operate them. Yes.
Is the two wire ring terminal intact on the rear rotor housing. It's about two inches left of bl on the rear rotor housing. Manifold off to see it. That two black wire ring terminal is the ground for the ECU.
Free fsm WITH wiring diagrams, is free for a download from a url on this site. Mazdatrix sells fsm's.
03-08-05, 04:11 PM
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wtf's a piston
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sorry sorry, it's an 8813bt engine (high imp.) and an 88' turbo harness (offset notch on clip, no plug for sylinoid resistor). There is no voltage at the injector plugs. whats weird is that it flooded before, now I unflooded it and will start in a second IF I put the gas in the engine myself. The harness was brittle when I bought it, and the extra "african engineered" plugs attached to the primary plugs did worry me some. Maybe between moving around the harness when unflooding it might have broke a wire. I guess I should just re-pinn the harness with some new injector wires. Thanks for the link, but it did not work.
03-08-05, 04:24 PM
#6
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Is the main relay clicking when the key is turned on?
If it is, and you have no voltage on either of the two injector pins at the connector (to ground), then the wiring is AFU between the main relay and the injector connectors.
If you DO have voltage at one pin of each connector, then the problem lies in the wiring TO the ECU (from the injector connector), the ECU itself, or the ground run to the rear rotor housing from the ECU...
If it is, and you have no voltage on either of the two injector pins at the connector (to ground), then the wiring is AFU between the main relay and the injector connectors.
If you DO have voltage at one pin of each connector, then the problem lies in the wiring TO the ECU (from the injector connector), the ECU itself, or the ground run to the rear rotor housing from the ECU...
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