PLEASE HELP with P0342 code, Tach drops to zero
12-03-2012, 05:32 PM
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PLEASE HELP with P0342 code, Tach drops to zero So I recently pulled my old LQ4 and put in a new one now Im throwing P0342 which is a cam positioning sensor low voltage code. The things that have changed, cam, I went from 226/234 .598 .612 to 234/242 .605 .615, ls6 crank, and longer connecting rods(6.3). It starts up fine, runs fine, doesn't seem to loose power at all but when i reach 3200rpm the tach drops to zero then throws the code. I can rev it fast from idle and it will work fine, when I rev it slow it drops to zero every time and after a few seconds the tach starts working again. Here is what ive gone through so far. Replaced cam sensor, crank sensor, battery, pcm, checked the wiring harness from the pcm to the cam sensor then made a new harness to replace it and still nothing. I haven't tried a crank relearn yet, but that's next on the list. Could this be something that can be corrected in the tune? Would the bigger cam, ls6 crank or longer rods effect this? Any help would be greatly appreciated this is starting to drive me crazy!
Last edited by Stover_SS; 12-03-2012 at 06:34 PM.
12-03-2012, 06:04 PM
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OH yeah I forgot to mention I also checked the grounds and checked the timing chain to see if it was loose when I pulled the intake and it seemed to be tight, but I haven't pulled the front cover yet to really get a good look at the cam bolts, but like I said this is a new motor and I know I tightened them to spec and used lock tight.
