Tampa 928s

Plenty of spark!
Used the Bosch noid light and it did not flash also my trigger wire is going to ground with Lh disconnected. Roger sent me an Ezk still did not start. I assume there is a short in the harness "here we go again".
Any feed back before I remove the Inj rail again?

Tampa 928s

Pulled all inj and the LH pin 13 ground went away; ground stayed untill the last inj was removed.
I removed fuse 42 and Ox sensor connector but it was still showing a 90 Ohm reading on the power side of the Inj to ground unless I remove W off the wire loom. This should be an open circuit as far as I know!
I removed the Fuel pump relay xx and factory jumper XXII next to it and tried to start the car to monitor the inj pulse. No pulse and no voltage.

Tampa 928s

Is there a way to turn off the fuel pump while keeping all the relays in place?

Tampa 928s

Reconnected fuel rails with out Inj connectors I get voltage on power wire when crankning but no Inj pulse on noid.
Reconnected all but one Fuel Inj still no pulse.
I toned back the pulse wire to pin 13 of the LH with everything disconnected looks OK.

Tampa 928s

I just rechecked my power to the following:

LH: Pin 21 on all the time
Pin 17 on with key
Ground ok on pins 5, 11, 13, And 25

Ezf: Pin 25 power with key on
Pin 12 Ground Ok

Checked Temp II fine on both units.

12v to Inj when starting, noid does not indacate pulse.

I have a question should Pin 21 of the LH be on all the time, this goes to LH Relay xxv according to guide?

Fabio421

So you have power but no pulse. What controls the pulse? It wouldn't that famous green wire would it?

I have no idea but at the very least you are getting a friendly bump for your thread.

Tampa 928s

Been talking to myself for 2-days

Pin 13 on the Lh provides the pulse I sent back the loaner LH to Roger but I dont think thats it. From what I see the relay sends power to that pin and should not have power on it all the time, but maybe I'm wrong.

Tampa 928s

I just noticed that the XIV has a built in diode in it I replaced it with a standared 53.
The part numbers indacate on the relay charts call for the same style relay;
141.951.253.b: For Ing relay IV, EZF relay XVI and LH XIV am I missing something? The Skem shows a diode in the EZF relay Humm.

Alan

Mark,
The EZF relay may be shown with the LED (diode) which is part ofthe fuse tester only. The relay function isthe same as a ..53b type only witthe fuse tester grafed on. you can swap it with a 53b and can also use the fuse tester relay in any other 53b slot. Maybe you never had the fuse tester relay - trust me you would have noticed it was different...

Alan

Tampa 928s

Thanks

I'm at a loss at this point not sure where to go now the Inj are not firing and every thing looks good!

Tampa 928s

I need to ask again should I have voltage in pin 19 with the key off?

I have spark , fuel and I have 12 V on Inj while starting but on Inj pulse !

Could it be that the 12v needs to be removed from Pin 19 to reset the computer allowing it to restart ?

Tampa 928s

How do you open up the black wiring Ecm connector I don't want to force it and break the plastic. I want to look inside and see if any wires may be having an issue.

Tampa 928s

Anyone?

Alan

Pin 19 may well float high when not connected - its just a coding plug input for low octane - should not affect getting injector pulses. Others may know for sure - but I would ignore that for now...

The output stage driver for '86 is as you have deduced very simple - all your injectors fire together - no bank separation - they all have batt voltage applied continually with the ignition on & fuel pump active (e.g. during starting & run) the LH pulls the other connector of all all 8 injectors to ground via a drive transistor.

Are you sure your injector drive grounds are connected properly - you need good grounding at ground points: IX & VIII (LH pins 11 & 25) for the LH grounds for the final drive stage - since you did a whole injector service - maybe something got disturbed? These grounds are in the engine bay - to the crankcase grounds to the side members - one each side IX on the passenger side and VIII on the drivers side - they feed into the injector harness.

The final drive stage transistors when driven 'on' by the LH connect the injectors to these grounds - if they are not grounded it will appear nothing happened - even though they may be working correctly...?

Alan

Tampa 928s

I rigged up a 9 volt battery connecting one side to one Inj connector used a Noid lamp on one other Inj and provided power to Pin 13 of the Lh, lamp fires and I can hear Inj turning on. I also connected it to W-12 and it worked the same way. I am waiting for two new Inj connectors to arrive on the slight chance they were shorting. When I crimped the wires on these Connectors it looked marginal at best. I guess this shows wires are not shorted, grounds look fine but when all systems are go I read 6 amps are going through this harness. This sure acts as a short but I will know later this week once the new parts arrive and put everything back together.