Ls1 s10
The cam sensor is at the rear next to the oil pressure sensor, It reads the Camshaft itself. ( Reluctor built into the cam)
The crankshaft sensor is on the side of the block just above the starter.
The crankshaft sensor is on the side of the block just above the starter.
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One way or other your coils are out of sequence. Backfiring through the intake used to mean you got your spark wires wrong on the distributor or your distributor was on the wrong tooth. Only way that happens on an LS is between the wiring between the ECU and the coil pack. If I had my coil packs in front of me I would be able to tell you which wires go to which cylinders.
Thread Starter
Teching In
Joined: Sep 2018
Posts: 19
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I put my pcm out of my 99 Silverado has same service number has same senerio now when I unplug the injectors it stops acting like it's out of time and starts to hit I took cam sensor out it has a couple scrapes on it so I'm swapping this out.
Right here is what I misunderstood:
OK, that makes more sense. My first thought, and it was more of a snide comment, was "Well yeah, without fuel it can't backfire, so that makes sense", followed immediately by "but wait, how did it run then?"
The cam sensor on a 99 will only get you either on time or exactly 180 degrees out of time, which won't backfire. That's firing at the top of the exhaust stroke instead of the top of the power stroke. When it backfires, unless it's a massive air leak int he exhaust, the coils are more like 90 degrees out of time, which only happens when the coils or injectors think they're on a different cylinder.
A bit of a embarassing story, but maybe it will help you. I put aftermarket coils and and aftermarket coil harness on my TA, and fired it up. Wouldn't hold idle without throttle, tried to rev, fired through intake, smelled horrible, etc. And from the old SBC/BBC/ "anything with a distributor" days, I know this means the spark plug wires are on the wrong distributor posts, but there's no distributor, right? So, I traced the harness wires, figured out which color was supposed to go to which cylinder from the ECU to the connector. I then pulled out the stock coil pack, and sure enough, I had the driver side coils wired 7-5-3-1 front to back instead of 1-3-5-7. I had simply flipped the aftermarket coil pack sub-harness by mistake. Reconnected it in the correct order, and everything right as rain.
I've seen similar things occur when guys relocate their coils to the frame to make space. The harness gets flipped and the car won't run.
The cam sensor on a 99 will only get you either on time or exactly 180 degrees out of time, which won't backfire. That's firing at the top of the exhaust stroke instead of the top of the power stroke. When it backfires, unless it's a massive air leak int he exhaust, the coils are more like 90 degrees out of time, which only happens when the coils or injectors think they're on a different cylinder.
A bit of a embarassing story, but maybe it will help you. I put aftermarket coils and and aftermarket coil harness on my TA, and fired it up. Wouldn't hold idle without throttle, tried to rev, fired through intake, smelled horrible, etc. And from the old SBC/BBC/ "anything with a distributor" days, I know this means the spark plug wires are on the wrong distributor posts, but there's no distributor, right? So, I traced the harness wires, figured out which color was supposed to go to which cylinder from the ECU to the connector. I then pulled out the stock coil pack, and sure enough, I had the driver side coils wired 7-5-3-1 front to back instead of 1-3-5-7. I had simply flipped the aftermarket coil pack sub-harness by mistake. Reconnected it in the correct order, and everything right as rain.
I've seen similar things occur when guys relocate their coils to the frame to make space. The harness gets flipped and the car won't run.
Overall I believe the wiring is close enough it should run from 99-04. I believe there are a few grounds in different places, but it should run. Now my question, are you SURE it's a 04 24x ecm, and nothing 58x?
Thread Starter
Teching In
Joined: Sep 2018
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The pcm is out of a 99 Vette and I have thought more on this and if I get a response from cpw it could be the case of the wire switched from side to side for injectors and or coils..if the harness ships without loom.im thinking of all possibilities,
Did you request it without loom? Mine came in loom, everything marked. Not to say it was perfect. Normally if you have some time, call Jared while your in front of the truck. He will walk through what to check with you. He has always provided great customer service. That's the reason I used him. Well, that, and 8 years ago, he was the only guy who built plug and play harnesses for a s10.