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Old 12-09-2017, 06:03 PM
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Default I'm stumped....

So im lost on this one. It is Charlie from kc turbos truck, something is broke in the motor, and it wont start. Cranks good. This apparently happened at same time, he shut it off when he heard evil noises, and tried restarting after, and its a crank no start.

Icp 1200-1500 cranking, rpm 180-200, drops as batteries start dying, ficm at 47v, l and v pwr at battery voltage. Sync was good, cmp fault was no, no ficm sync. Tried ficm off one of his other trucks, no change with ficm sync. Load tested communication wires from pcm to ficm, found 1 open. Replaced engine arness, no change. Unplugged injectors 1 at a time, none changexd. Unplugged both injector harness connectors at ficm to rule out ficm harness, no change. Shield ground is attached to intake as well. Swapped pcm from my truck that runs, they have thr same strategy, no change. Swapped ficm from my truck, no change. All pins at ficm, pcm, and inline connectors are not pushed out or broken or anything stupid like that. Swapped in new crank sensor for ****s and grins, now have cam fault, and obviously lost sync. Swapped in cam sensor that was planned anyway, still have cam fault and no sync. Swapped original crank sensor, as seemed to be what caused cam fault, even though reading rpm right, still cam fault. Swapped old am sensor back in, still cam fault. No buildup of chit on either cam or crank mounting bosses, but i will be taking emery cloth to them tommorow. Inspected crank tone wheel while cranking, didnt see any bends, doesnt mean its right, but its turning straight. Couldnt see too good thru cam hole, but thought i may have seen the cam button go by. I was just using a mirror and flashlight.

So in short new ficm, pcm, harness, cam and crank sensors, and no start. Any ideas?
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04 cclb IDP and TSD tunes, KC Stage 2 hi pressure, S476 atmosphere, Odawg Stage 2 ported intake, RCD Stage 1 cam, RCD lifters and pushrods, RCD 120# valve springs, ARP 625s, o ringed heads, Warren 7mm 250/100 hybrids, Strictly bowl dereete regulated return, Air Dog 2 4g, Snow stage 2 water/meth
  #2  
Old 12-09-2017, 06:27 PM
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Did the tone wheel move on the crank and it's not in time?
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Old 12-09-2017, 06:30 PM
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Didn't we come to conclusion when I fought this similar issue that the crank sensor in a way powers cam circuit?

Do you have a pico?
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  #4  
Old 12-09-2017, 07:07 PM
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I'm not sure on the tone wheel moving. I didnt bring stuff home to see if its tight or not. Plan was to get tje,motor running before pulling it so I don't pull my hair out after building it. And yes, the voltage from the,crank sensor powers the cam sensor. But I don't know what I got now. My dumb ads had such faith,in the harness fixing it I didn't bring my electrical **** home. Doing everything from ids readings right,now....
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04 cclb IDP and TSD tunes, KC Stage 2 hi pressure, S476 atmosphere, Odawg Stage 2 ported intake, RCD Stage 1 cam, RCD lifters and pushrods, RCD 120# valve springs, ARP 625s, o ringed heads, Warren 7mm 250/100 hybrids, Strictly bowl dereete regulated return, Air Dog 2 4g, Snow stage 2 water/meth
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Old 12-09-2017, 08:13 PM
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Remember I had RPM readings but the wheel was jacked up. I know you said it spin straight, doesn't mean it didn't move
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Old 12-09-2017, 09:25 PM
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Yeah, that was my first though. I brought home the stuff to do cam timing when i found the open wire. My dumb ass had forgotten my ids that night, so i figured i would rule out the harness before doing cam timing checking. Then, i for some dumb reason had so muchfaith in a harness fixing it, i didnt bring anything to further diagnose it home. .

It is popping like its got a broken rocker, Charlie said all rockers move good, he had checked that before calling me. Hes thinking valve seat, as it will come and go, and will occasionally have a tapping type knock with it that comes and goes.

Timing would cause it to pop as well i suppose, but it only sounds like its got one, maybe two cylinders popping though.
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04 cclb IDP and TSD tunes, KC Stage 2 hi pressure, S476 atmosphere, Odawg Stage 2 ported intake, RCD Stage 1 cam, RCD lifters and pushrods, RCD 120# valve springs, ARP 625s, o ringed heads, Warren 7mm 250/100 hybrids, Strictly bowl dereete regulated return, Air Dog 2 4g, Snow stage 2 water/meth
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Old 12-09-2017, 09:52 PM
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Might be a good idea to check the dowel on the camshaft that the cam sensor reads. Had a truck earlier this year come through that the cam gear was working itself off the camshaft and causing no start because the cam was sliding back and the cam sensor couldn’t read the dowel.


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  #8  
Old 12-10-2017, 04:02 PM
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Well, no longer stumped.... Figured we had ruled out all electrical issues, tore the motor out and apart today. He broke #8 rod, cam is damaged on one of the lobes where the rod had been hitting, it appears it held the cam a bit, and the gear twisted. The gear peg is crooked, dont know if it broke off or not, as i dont have a press at home. Crank tone wheel was good though .... It broke the block at the bottom of the cylinder, witb a crack starting to run up the cylinder, and it got a pretty good crack at the bed plate sealing surface. Basically its fukked beyond all repair...

Hes got the pictures, im sure he'll post them next time hes on.
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04 cclb IDP and TSD tunes, KC Stage 2 hi pressure, S476 atmosphere, Odawg Stage 2 ported intake, RCD Stage 1 cam, RCD lifters and pushrods, RCD 120# valve springs, ARP 625s, o ringed heads, Warren 7mm 250/100 hybrids, Strictly bowl dereete regulated return, Air Dog 2 4g, Snow stage 2 water/meth
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Old 12-10-2017, 04:51 PM
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Well ****.

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  #10  
Old 12-10-2017, 05:15 PM
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Yup, so much for makng sure it ran before pulling it apart...
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04 cclb IDP and TSD tunes, KC Stage 2 hi pressure, S476 atmosphere, Odawg Stage 2 ported intake, RCD Stage 1 cam, RCD lifters and pushrods, RCD 120# valve springs, ARP 625s, o ringed heads, Warren 7mm 250/100 hybrids, Strictly bowl dereete regulated return, Air Dog 2 4g, Snow stage 2 water/meth
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