Help with p1345 code

[Kmoody528]

I have a 97 k2500 suburban 7.4 vortec 136k miles getting a p1345 code saying crankshaft and camshaft position sensor.

I have no rough idle no stalling issues, only occasionally when I start maybe once per week the rpm’s fall to where it sputters and go back up after a second.

The distributor hasn’t been touched ever since I’ve had it at 118k miles and no issues until now.

I’m wondering if anyone has had a similar experience and what the solution was, I’ve read it could be either sensor, a distributor and rotor issue, or a timing chain issue.

I have an obd2 code reader but it won’t actively read engine data.

 

[docstoy]

Have you ck'd to see if this site may have the service information or diagnostic manual for your truck ? Never worked on many big blocks but driveability is driveability whether it's 20 cu. In. or 2000. I don't have that info so I'll have to refresh my memory before I could be of much help, but will get back to you

 

[Kmoody528]

yeah i have most of what i find is for 5.7s they seem to be similar architecture I'm not sure if there's something I'm missing. While the drivability is fine i need an emission test within the next 90 days. Ill probably go pick up a scan tool with live data today and see if i can check the cam retard it seems like the most common problem considering everything runs fine. I guess my question would be can the engine come out of time with wear and tear or maybe temperature fluctuation?

 

[docstoy]

yes, especially if only starting occasionally, reason being if engine sets then lubrication (oil) is going to follow gravity and return to oil pan so everytime you start engine , is like a dry start no lubrication for just a short period of time, which means wear on rotating or moving parts, which could eventually cause a problem or ses light to come on .

 

[docstoy]

So ,I think you need access to scanner, download and read chart for your application which will very likely be in service manual sticky and go from there. Hope this helps