Timing Chain Slack and Code P0343
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From: Naperville, IL
Timing Chain Slack and Code P0343 I have a LS2 402 block, L92 heads, mild 230/236 600 lift cam. The block has about 11k miles on it and originally I had the wrong cam gear (vendor sent me the wrong one and I had no clue until I started having problems) so I was getting P0343 codes and some backfiring upon start up, but that was fixed within the first 200 miles. Since then the engine has run fine. I just recently swapped over to a L92 set up and started getting intermittent P0343 codes (along with the occasional P0341 and P0342).
I replaced the cam position sensor and it did not make any difference. I also checked the wiring as much as I could and it all seems to be in order.
I then uspected that the cam gear might be working its way loose so I pulled the front cover and low and behold it is tight as can be, same for the retainer plate - the Locktite was doing its job just fine.
I did notice that the timing chain (a stock Ls2 that I bought with the block) seems to have a lot of slack in it - I can move the loose side about 1/2" inward at the mid point. I looked for specs on allowable slack but could not find anything.
Does anybody know the spec for timing chain slack?
Does anybody think that the slack could be the cause of the intermittent codes?
Thanks.
I replaced the cam position sensor and it did not make any difference. I also checked the wiring as much as I could and it all seems to be in order.
I then uspected that the cam gear might be working its way loose so I pulled the front cover and low and behold it is tight as can be, same for the retainer plate - the Locktite was doing its job just fine.
I did notice that the timing chain (a stock Ls2 that I bought with the block) seems to have a lot of slack in it - I can move the loose side about 1/2" inward at the mid point. I looked for specs on allowable slack but could not find anything.
Does anybody know the spec for timing chain slack?
Does anybody think that the slack could be the cause of the intermittent codes?
Thanks.
