Sales2@Texas-speed

iTrader: (5)

That box uses the cam and crank sensor both to dictate the timing properly (assuming you're still firing coils and not running a distributor).

IHEARTLS1

iTrader: (1)

any proof of this? this dude runs his own car and is not dumb. just giving you facts here: my car starts and runs no probelm, and according to the computer, is giving me the timing that i have specified for it. in order to rearrange my schedule and put forth the time to change the cover, i need definetive proof that not using the cam sensor either ALTERS the timing, or produces false timing settings. as in 32 degrees is NOT true 32 degrees.

Sales2@Texas-speed

iTrader: (5)

Call MSD and ask how the box knows which cylinder to fire. The crank signal can give it RPM, but cannot tell it which stroke it is on...that is the cam sensor's job (same as on GM PCM comb's). That cam signal differentiates between that intake and exhaust stroke (every time one of these engines starts on GM PCM combos actually).

It'll give the right amount of timing, I have no doubt. But if it's firing the correct cylinder every time you start and run without the cam signal, MSD has clearly figured out something that GM never could/has.

IHEARTLS1

iTrader: (1)

msd gives me nothing but generic answers. i can see it assisting in quick starting, but if it does not know the exhaust stroke or intake stroke, tha twould cause it to either be 180 degrees out or not on each start attempt. but then after it is successfully started on the correct stroke, wouldnt it maintain that correct position as long as the engine is running? i'm going to have to change the cover, but if i can get away with it for now, it would be ideal.

Sales2@Texas-speed

iTrader: (5)

I've been looking through all their tech forum as well, and can't find any useful info either. Everything they have just says it requires the cam sensor. Maybe without it, it just assumed one or the other and kas kept it on that since then and doesn't readjust every start. If that was the case, you got lucky on the first start-up then I guess you're set as long as it never looses power?? Not really sure there. If it was firing on the incorrect stroke, you'd have a no start (or MAYBE a very hard start) condition.

And I'd like to apologize once again for misinforming you on that before. If I'd had your name or contact info when I figured that out yesterday, I would have hurried to call you and save a bit of time on your project! I felt terrible for giving you the wrong information, and that is never my/our intent!

IHEARTLS1

iTrader: (1)

it's no problem. i ordered an ls2 cover from a junkyard. won't be here until next week so for now i'm going to drive the car lightly to get the exhaust done, and start tuning the carburetor. i will change the cover but this is really cutting it close. may 13th we leave for pinks. still need to put a roll bar in.

3pedals

iTrader: (3)

I got mine from an 07 5.3 wreck. lots of em out there.

IHEARTLS1

iTrader: (1)

i changed to an ls2 style cover and my cam sensor failure issue went away. the only thing i notice is the car starts the first time every time now. normally before it took 1-3 times to get it to start. i don't notice any change in the way the car runs at all.

chevellepowered

iTrader: (37)

i need this thread thanks!!! i did same swap..thought i could use vvt cover.turns out its hard to start..but runs fine when running.... so i need to get ls2 cover..

djloc79

Very enlightening!! I'm trying to start up using the lingenfelter converter and couldn't figure out why is was backfiring. That picture posted by Jay_LT4 was exactly what I needed. Thanx alot!

jay_lt4

iTrader: (4)

no problem!

djloc79

In the above photos, you notice the differences in the assemblies behind the harmonic balancer? Would all of that have to be changed as well?

Jason Haines @ LPE

One image shows the oil pump still on the engine and the other doesn't. You can keep the L92/VVT oil pump although you may have high oil pressure at high rpm with that pump.

BTW - as I think has already been mentioned, the L92/L99 (VVT) camshaft sensors are the same as the LS2/LS3 sensors but the timing covers are different and the air gap between the sensor and the timing gear would be wrong (too big) if you put an LS2 or LS3 cam gear onto an engine with the L92/L99 front timing cover. You need to switch to the LS2/LS3 timing cover (GM part # 12600326). That cover doesn't come with the seals or gaskets (seal GM PN 12585673, gasket GM PN 12633904).