Tampa 928s

Does anyone know a way to see the pulses from to the Injectors with out taking apart my 86?

Tampa 928s

Stupid ? I pulled a plug grounded the plug via a battery jumper cable to ground the spark seems weak is there another way to test this?

Fabio421

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• Simply press the 7” long probe tip against the injector body and the bright LED strobe will flash with each time it opens.
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Bill Ball

I have one of the tools Fabio notes, but in a pinch you can improvise with a mechanics stethoscope or any solid rod held against the bone next to your ear. Oh, and just for clarity, this is not a noid light - that hooks to the injector plug and shows whether it is getting the electrical signal to fire. That would be handy to diagnose why the injectors are not firing. I know the rails are different on an 85-6, but can't you get to the injector bodies for the solenoid vibration test and to the plugs for the electrical test w/o removing the rails? When the injectors fail to fire, often it is a short in any one of the injector plugs. A short in one lead, they all go down. Peel back the plug rubber boot and check the wires. Often these boots are so brittle they won't peel back without cutting them off and often the wires are a mess underneath. Handling them on an intake refurb job can finish them off. The boots are available as well as new plugs with pigtails form a variety of sources.

Alan

Mark,

I don't know how hard it is access & pull the injector connectors off an 86 - but you only need the electrical connector - then one way is to connect a noid light instead of the injector and you can see if it getting firing pulses. If you can test physically and hear the solenoid opening - thats probably good enough. Bill is right they are all in parallel per bank - one bad wire will take the bank down and may cause a no start... You'd still smell some exhaust fuel from the other bank maybe. If you pull a plug each bank - are they both wet?

The spark test is OK but you will need to check all the wires individually - don't pull a plug and leave it open when testing though... too much fuel supply...

Alan

Tampa 928s

I did get the rear inj connector off the Pass rear. I put a lamp power indacator probe on it and it flashes while turning over. This is the type with a bulb that connects to ground. I do have a scope would this be a better way to to test it?
I'm running out of things to test.

Alan

Can you do the same on the driver side bank somewhere?

Yes a scope would also be good - you will need the lamp in circuit too (or some Rx load) - verify against the ~waveform in the doc I sent. It will be a bit messed up by the bulb characteristics - but you should see the pulse and be able to verify its ~width)

Were you able to verify you are getting spark on all cylinders?

Alan

Tampa 928s

I HAVE COME DOWN WITH SOMETHING AND FEEL LIKE CRAP SO BEEN GOING OUT AND DOING A LITTLE AT A TIME!
I took an old Inj and connected to the last bank and turned over the car and no fuel is being sprayed. The test probe did indacate voltage and some type of flicker, pin 18 firing Inf mode in the Lh is not shorted to ground.

Imo000

What is the "last bank"? You mean the last injector on one of the banks and did you connect this injector to the fuel rail?

JHowell37

Unless the injector was plugged into the fuel rail it won't spray fuel because it has no source of fuel.

Tampa 928s

86
Do to may advanced condition of sickness I was looking for the fuel spray with it being disconnected Well that was smart. I had my 9 year old turn it over and did not feel if the Inj is moving. the book says you should have 12 v when key is on, my voltage comes on when cranking only. My scope on the Inj connector does not indacate a wave signal so I assume I may have a short in the harness or a bad EZK ?

Bill Ball

Hey, Alan, my reading of wiring diagrams is suspect, but I came up with all 8 injectors sharing a common ground signal from the LH, firing once per crank revolution as a batch. Even though 89+ has the ignition monitoring system and can shut down half the injectors by interrupting the power supply, the ground for routine firing is shared by all 8. So, a single short and all 8 go out. Please correct me if I am wrong.

Tampa 928s

Bill
Your right my 86 has one common ground switched by thr LH pin 18!
I replaced all the connectors and Injectors I may have a short but cant see why I guess I'll dig into the harness this weekend!

Tampa 928s

JUST PICKED UP MY NOID TEST SET:
High energy spark tester, 26 led lamp and a good cigar I'm ready now !

Alan

Good luck!