supercatxr7

iTrader: (5)

Can anyone confirm if the cam sensor is only utilized for start up in LS motors? Here's the issue:

Car is an 2006 Monte Carlo SS 5.3v8 LS4 E40 PCM with a 2007 5.3v8 LS4 in it. When I put the 07 motor in the car would not start. In 07 GM changed the CAM and Crank reluctor wheel to 58x just like other LS motors. So this caused the no start issue.

I ended up buying the Lingenfelter TRG-001A and this allowed the car to start and run. Only issue is I do not get a cam sensor signal out, and get a PO340 code. Car seems to run fine without the cam sensor connected. May take two tries to start, but it eventrually starts and runs fine, no other issues.

Is the cam sensor only used for start up? I've gotten into it a little and no misses or issues otherwise. Just don't want to chance it and would like to know for sure. Thanks!

deadhorse66

iTrader: (2)

No, your car uses CKP reference for startup, CMP for timing of spark and injector pulsing. If you want, I can copy the description and operation from the GM service manual for you...

deadhorse66

iTrader: (2)

(Copied directly from the manuals)

Engine Control Module (ECM)
The engine control module (ECM) controls all ignition system functions, and constantly corrects the basic spark timing. The ECM monitors information from various sensor inputs that include the following:

• The throttle position (TP) sensor

• The engine coolant temperature (ECT) sensor

• The mass air flow (MAF) sensor

• The intake air temperature (IAT) sensor

• The vehicle speed sensor (VSS)

• The transmission gear position or range information sensors

• The engine knock sensors (KS)

Modes of Operation
There is one normal mode of operation, with the spark under engine control module (ECM) control. If the crankshaft position (CKP) pulses are lost the engine will not run. The loss of a camshaft position (CMP) signal may result in a longer crank time since the ECM cannot determine which stroke the pistons are on. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.

deadhorse66

iTrader: (2)

I also found a P.I. document for your car in reference to that particular DTC. You might want to go to your local dealer and have them print you a copy of it.

supercatxr7

iTrader: (5)

Thanks, I appreciate you taking the time to post the info.

Doubledip

did you use the extended abcle that comes with the Lingenfelter module... on the E40's you need to fit the extension as the wires are crossed

supercatxr7

iTrader: (5)

Yes, I did use it. Also bought another sensor too just in case it was bad, but no luck with Cam signal and still PO340.

Doubledip

ok and you are plugging directly into the cam sensor or into a little half moon adaptor harness around the balancer?

supercatxr7

iTrader: (5)

Yes, that's where I'm plugging in.

Doubledip

into where?

supercatxr7

iTrader: (5)

plugging into the cam sensor itself.