weird issue...
I had a similar problem with my 98' LS1 harness and before ordering a new harness I sent my harness to Jesse(WAIT4MEPERFORMANCE.com) and they tested it and reworked it for cheaper than their normal asking price, there was some faulty wiring. It will be much cheaper than buying a new harness.
If it isn't doing anything with the starting fluid then the is no way you can be getting spark, unless all your intake valves are closed which I highly doubt. Lookin at the schematic for the ign system and the inj system they both use the same power source and the only thing that all of the coils have in common is the ground G114 on the back of the left head.
If it isn't doing anything with the starting fluid then the is no way you can be getting spark, unless all your intake valves are closed which I highly doubt. Lookin at the schematic for the ign system and the inj system they both use the same power source and the only thing that all of the coils have in common is the ground G114 on the back of the left head.
If you dont have a headlight and have concerns about a circuit resistance isnt a good test, you would be better off doing a "voltage drop" test. To test one of your PCM grounds Take your + lead of your DVOM and connect it to the ground wire at the PCM, place the - lead at the ground side of the battery (final destination) you shouldnt see more than .5v drop while operating the circtuit, in this case cranking. If you see a large drop start breaking the circuit into smaller pieces, leave your lead on the PCM and move your ground lead to the ground point on the engine, if that checks good, then you have a grounding issue of the engine to the body etc. I would guess that something along these lines is your issue with your complaint.
Your just checking to see how much voltage is being consumed by the circuit.
So you understand why this is a better test, say you had a wire that was frayed down to 2 strands, if you just checked resistance it would check fine, but if you voltage dropped the circuit, it would likely show a large voltage drop across the circuit.
HTH and good luck.
Your just checking to see how much voltage is being consumed by the circuit.
So you understand why this is a better test, say you had a wire that was frayed down to 2 strands, if you just checked resistance it would check fine, but if you voltage dropped the circuit, it would likely show a large voltage drop across the circuit.
HTH and good luck.
y order a new harness??? if indeed its some kind of harness trouble...i would perform continuity test on each wire to each pin on the pcm connector...that way you can verify short/open and continuity to proper pin...tideous but will save u money if trouble is not in ur harness...
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turns out....... my plugs were the issue. They would spark when grounded outside of the engine, but too fouled to spark under compression and fuel. Put 22 bucks worth of tr6s gapped at 32 thou and she exploded to life !!!! 
Winner Winner Chicken Dinner? It doesnt make sense if you have compression,fuel and spark it should at least be popping and farting, I know you said you checked the plugs but I have had a similar situation where the engine I was working on was in the same situation as you are in. A old mechanic friend suggested new plugs and I said the same thing the old ones have a spark that looks ok, and I was sure the plugs were not the problem, well for ***** and grins I installed new plugs and it fired right away, I dont know why but that did the trick I am still scratching my head to this day and give props to my old mechanic friend.
Glad to see you got it straightened out. I know the feeling when you have issues like this with a project vehicle, you find yourself losing sleep and not being able to concentrate on anything else.
Open Mind Glad you got it running, it's a great feeling when you hear it fire, I've been in that situation and sometimes we over engineer it and instantly start thinking it is something major, but it turns out to be something very simple which is always a releif. I've been told many times about the K.I.S.S. ( Keep it simple stupid) so now I keep an open mind on these types of problems especially the ones that just don't seem to make sense.
Am I ever excited!!!! hahah I took it for a spin tonight. I think my wastegates must have been stuck. They are unplugged with 8lb springs in them and I was seeing 15 and building until I pulled out. Thats minor, it sounds great and drives just like I parked it
