P0343 after cam swap - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 09-05-2017, 08:56 PM
amrainier amrainier is offline
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2004 Buick Rainier
Cranberry Red Metallic 5.3L V8 AWD
Join Date: Sep 2017
Location: portsmouth va
Posts: 2
P0343 after cam swap

I recently swapped a ls6 cam P# 12574519 into my 04 rainier 5.3. ls6 cam, ls6 springs, and ls6 pushrods. I had 3 bad lifters and decided to do the cam swap since I had to remove the heads to get the lifters out and didnt want to chance it by having a damaged cam. after replacing and swapping everything it runs great. but ive got code p0343 ever since first start up. and starting sucks 50% of the time. Ive changed the cam position sensor 2 times and even installed a gm sensor but still get the code and hard start. I never removed or messed with the wiring to the sensor during the swap and never had a problem before swap aside from the bad lifters. Do I need to use a ls6 cam position sensor and not the 5.3 they look the same and are in the same spot but both have different part numbers. I know to look at the plug and test the 3 wires and look to see if the reluctor is damage. Im sure the cam isnt loose and non of the replaced sensors had any damage to them. like i said from first start up ive had this code and have cleared it a million times but comes back as soon as i clear it. Any other ideas?
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  #2  
Old 09-06-2017, 08:59 AM
amrainier amrainier is offline
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2004 Buick Rainier
Cranberry Red Metallic 5.3L V8 AWD
Join Date: Sep 2017
Location: portsmouth va
Posts: 2
Well looks like I found my problem the cam is a ls2 cam not a ls6. The ls2 has the luctor on the front cam gear and ls6 has it built into the rear of the cam it's self.
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