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We have heard of the broken wire over the drivers side wiring harness over the valve cover. We ohm it out and all looks good but still have the issue, Some get lucky and pull on the wires and the insulation stretches revealing the break or not. Then after replacing the harness all issues go away. Wouldn't it be nice to fix that old harness and find the break?
I had a real PITA wiring issue many years ago on an old car I was working on. It would idle rough and stalls out in gear. On fast idle it was fine.
new points, cond, coil, resistor, cap , rotor, plugs, HT wires, distributor and still the same.
Dad took a look one night and said he thought it might be a broken wire. Everything Ohm'd out fine for me even with wire shaking.
That is when dad grabbed a 10 amp fuse, wire and a twin beam head light.
WARNING: This can cause a fire with the wires and sparks are bound to happen.
We took every wire off and connected them in series one by one to the head light fused to the battery and watched the lamp glow until one wire burned up in a spot in the middle.
Grabbed a butt splice to test, no more rough idle after.
let me clarify my question----if I pull a n injector selnoid off bring it to a bench -- I belive it is some kind of electro magnet can I give it power some how to see if it is still working before I have to buy $ four
Sounds like you have a bank shorted out. The drivers side harness will chafe at the valve cover and cause this at times.
you can ohm out each injector while its unplugged to see if you have one shorted
Good advice.
I would first look at the harness on the driver's side where it runs past the valve cover as suggested above. This is a well documented harness weak spot.
Disconnect the battery and unwrap the harness checking every wire carefully. Even if you find nothing wrong after examination, it's well spent time to reinforce the harness anyway.
The wire insulation gets brittle, cracks form and gradually causes intermittent shorts (electrical arcs - DC arcs are hot). This eventually destroys the wire insulation and the conductor too.
Use decent quality replacement insulation tape and get some weather proof automotive fiber tape to pad between the wires as a friction buffer. Use this tape to re-wrap the harness. I put a spit plastic spiral friction sleave over mine after wrapping it.
Good luck.
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IDM wiring load test
