bandit383

iTrader: (8)

All right guys I’ve got a LSX tall deck in a 2001 trans am with LS2 conversion kit. the cars kicks out DTC P0343. I have Ohms CK the harness from extension harness to PCM all good. The ignition wire to sensor has 12v with the key on. Now when the cars runs the hi and lo don’t record any values on HPtunners (see attched data log). I am at a loss as to what is wrong... Also the tach in the car is inop but will read through the PCM..

S10xGN

iTrader: (11)

There was a thread here a few months back about someone who had done the LS-2 conversion and due to a mismatch of parts, his cam sensor was too far away from the cam gear to read correctly. He either had the wrong front cover or sensor, cannot recall which it was...

ND400

Got the right cam sprocket?

bandit383

iTrader: (8)

Fixed.. Swapped outer wires on cam sensor extension harness.

Sales2@Texas-speed

iTrader: (5)

That is always my first suggestion on this issue! Hard start, tach bouncing or inoperable, and cam sensor high/low voltage codes (in a swap such as this) is almost always those wires needing to be switched!

Big Black SS

iTrader: (3)

im getting same code and rpm tach dont work .....wich wires do i need to swap ? its a 5.3 with a big cam in it ...any pics of the wire? i really dont want to take it back to the shop if its something easy i can do ... thanks

Sales2@Texas-speed

iTrader: (5)

It is easy to do! Find the cam sensor, it has three wires going to it. A-B-C are the wires, just swap A and C in the pigtail.

Big Black SS

iTrader: (3)

oh ok that is easy !!!!!! and the reason its throwing the code (p0343) is because i went from the ls1 to the 5.3 correct ? ( has ls6 intake, bigger injectors,big cam,and stock exhaust for now) .........i dont think the shop got a extention harness ,ill check but if they didint do i still switch the A and C wires ?

Sales2@Texas-speed

iTrader: (5)

It is typically throw when you go from a rear-mounted cam sensor (LS1) to a front mounted cam sensor (such as the late model 5.3's) with that extension harness from Caspers.

Big Black SS

iTrader: (3)

my 5.3 is a 2002 so its still in the back ? do i swap the A and C wires still ? i dont want to remove the intake if i dont have to

Sales2@Texas-speed

iTrader: (5)

Might check that you have a good connection there and to the PCM then. If you didn't extend the wires then you shouldn't need to swap those. Ensure good connection at the sensor, no pinched wires (between the transmission and block particularly), and good connection at the PCM on both banks of wires.

Big Black SS

iTrader: (3)

so the intake needs to come out to check rite ? ......ok thanks so much

02blackbeauty19

iTrader: (22)

Matt, I just did a LS2 swap in my C5 corvette and I have this code. I heard the occasional backfire yesterday as I drove it for the first time.

I have the Casper's harness. Just to be clear, where do I need to swap the wires? The pigtail where it plugs into the sensor itself OR where the Casper's harness plugs into the sensor pigtail?

Big Black SS

iTrader: (3)

here was my problem , wires were kinked and one was compleatly cut in half. now everything is normal