P1345

Help with code p1345. I just put a used engine into my 1997 Tahoe 5.7.
I have used a scanner to rest the code and it comes back shortly after start up.
I have checked to see if I have the dis. Set at TDC (hope I am not off one tooth)
If I were off a tooth would the truck run?
I looked on this and other forums and found some things to CK
Yes I am getting some play in the rotor (will a new gear fix the code?)
I have tried to move the Dis. And I can get the code to go away but the engine runs like crap. (Yes I know I can not change the timing this way.)
Also is there a way to test the cam sensor?
The scanner I am using dose not show me cam retard. So I tried to tune by ear.
Also the tach dose not seem to read. Some time it will lag behind or read lower then the scanner (this is not a new problem) with moving the Dis. the seems to be working.(but I get the P1345 code.)
The used engine I installed has 152K on it. The Dis. is from the first engine it had 184K on it.

Thank you for the help.

Diagnostic aids from a '98 C/K manual for P1345.

1. A loose CMP (cam position sensor) causing a variance in the sensor signal.

2. Excessive free play in the timing chain and gear assy.

3. Incorrectly installed distributor-1 tooth off in either advanced or retard positions.

4. A loose rotor on the distributor shaft.

5. A loose or missing dist hold down bolt.

There are countless threads on this code and how to correct it.

The scanner I am using dose not show me cam retard. So I tried to tune by ear

You have to use a scanner...DO A SEARCH!

Thanks for the help. I did do a search and talked to a tech at a dealer most likley I am one tooth off. thank for all the info.

Twice now on my 2003 trailblazer i have gotten the p1345 code. To repair the problem you must remove the cam speed sensor. the power steering pump must be removed. once the sensor is in your hand look at the end where there is an allen wrence hole. remove the end, and small spring and set aside. at this point the only thing left is to remove the shaft inside the sensor. clean the shaft and the inside of the sensor with alcohol, lube with clean oil and make sure that the shaft slides easily within the sensor. reinstall spring and end cap, tighten end cap until snug. reinstall, remove negative battery cable end for several minutes and start engine. this has worked for me twice..Growler521