how hard are they to replace on these 03-07 5.3's?

where can i find them the cheapest?

 

its not very hard at all.. me and a buddy did mine in 45mins

 

Don't buy Autozone parts. I replaced the rear with Autozone part and front with O'rielly part. Autozone part crapped out already and throws code almost every day and stays on for two gas fills then goes away for a part of a gas fill duration. I just deal with it now.

 

well it has a knock sensor code and now it ticks a little nothing crazy but it makes me worry big time

 

Take off the intake and they are sitting on the valley cover.

 

Yeah dont buy auto zone..ill always delt with advance and there about 60 bucks a piece and if i were you i would replace both of them while you already have you intake off....Not hard at all...undo all your hoses and lines make sure you mark them. Make sure your motor is cool before you start taking fuel lines apart. take your intake off and there at your knock sensors unplug take them out witha socket and repeat reverse order. Hope it helps oh and if you happen to buy from Oriellys and your replace your intake gasket dont buy it from there cause it will be the wrong one....go advance auto and nothing else

 

https://www.performancetrucks.net/fo...d.php?t=473447

 

around $50 a piece at o'reilly's. be sure to silicone the caps on so they don't rust out again

 

did some yesterday it took longer to clean everything, and I went ahead and replaced the harness too. I paid close to $50 for harness from dealer and silicon the caps like someone else said. torque knock sensors to 15 lb ft and
lower intake manifold bolts on final pass to 89 inch lbs