99 lesabre camshaft sensor wiring - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-27-2014, 04:12 PM   #21
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just got in the correct ignition module. again no firing from middle coil pack. swapped them around and no still firing from middle coil pack??? top and bottom coils always fire no matter which coilpack is on them
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Old 08-27-2014, 05:50 PM   #22
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have a friend few miles away with a 98. he let me swap entire icm and coils with his and it runs fine on his and not on mine. neither of the towers from middle coil fire. on my way to buy spark plug lite to jump to ground. hard to think i would have two plug wires bad at same time but who knows till you test them
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Old 08-27-2014, 06:57 PM   #23
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no spark on lite when between tower and spark plug wire. no spark when i put lite on tower and other end straight to ground. i have 12vdc on one spade terminal to ground. no 12vdc spade to spade. top coil spades read the same. do this module have three diff grounds that crankshaft sensor turns off-on. i noticed sensor has 4 wires which may be one to each coil??
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Old 08-27-2014, 08:12 PM   #24
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as i was troubleshooting today the engine would almost lock up and buck a little. thought it was weak battery as its been down a while. i was charging it. got tired of waiting and pulled truck over with jumper cables. still tried locking up and bucking. pulled off all coil wires and it spins free everytime. put them back on(double and triple checked their position) and back to locking and bucking except sometimes it fires up and runs except the middle coilpack has never fired. eems as though it does not know when to fire
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Old 08-28-2014, 06:01 AM   #25
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Ok let me make sure I am understanding what is going on, with the ICM and all coil packs from your friend you have spark to all 6 cylinders, and it runs fine?

But with your old, and the new ICM, when using your coil packs only the top and bottom coil packs are getting spark?
You did swap the coil packs from your top, or bottom to the middle right?
When doing so did actually swap them, or did you just remove the middle one, and put the top or bottom in place of it, without putting the possible bad coil pack in place of the one you moved to the middle?
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Old 08-28-2014, 09:07 AM   #26
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sorry. my icm and coil packs work fine on his car, neither my icm and coils or his icm and coils work on my car
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Old 08-28-2014, 09:12 AM   #27
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try trading the wires with the other car
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Old 08-28-2014, 09:58 AM   #28
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spark plug wires??? i verified no spark from post with test light to ground. if you mean wiring harness i dont think that would be feasable
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Old 08-28-2014, 10:36 AM   #29
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Hmmm, I'm not sure what could get damaged that would stop 2 of 6 cylinders from firing.
Your positive you wired the camshaft position sensor correctly according to the diagram?
Did you check to see if any other wires were hit by the belt, like the ones going to the crankshaft position sensor?

If all of that checks out I am not sure what could be causing that coil pack not to be commanded to fire.
Hopefully somebody else has some ideas, I'll try to do some research, and see what I can dig up, but I've not heard of any others having this problem after replacing a connector for a CMP, or CKP.
It is definitely not your ICM, coil packs, or plug wires, as you have ruled those out already.

You may end up needing to verify all the wires coming from the ICM, going to the CMP have no more breaks in them, can you use the diagrams, and a multimeter set to ohms to verify each wire does not have a break, from wire end to end you should see 0 ohms of resistance.
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Old 08-28-2014, 01:34 PM   #30
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i read somewhere of similar problem that an oscilliscope found by looking at waveforms. seems the fins on harmonic balancer that signal crankshaft sensor had been bent. when i was removing the shredded serpentine belt it was wrapped behind balancer. i will pull it and check them which will also give me access to crankshaft sensor and its wiring
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