I rebuilt my 5.3l in my 2002 Silverado. I will attach my last scan, my last edit and my Cam card. I need help. Truck runs good sometimes, other times it idles rough. Had some backfires on his last scan. Basically installed new cam, bored the cylinders .40 over and enlarged my intake valves to 2.11in. Everything else on the motor is stock.02 Silverado Idle.hpt11282022 1300.hpl
Your cylinder volume is all wrong. You didn't make the engine that large. Boring a 5.3 .40 over doesn't make it a damn near 6.5L engine size.
Correct that number for sure.
It's going to want a little more base running airflow. Put the VE table back to stock, there should be no reason to pull that much fuel away from the VE.
28 degrees of idle timing is way too high, this isn't a small block 350. Aim for more around 20-22 degrees.
I can't view the logs but you will require a wideband oxygen sensor for tuning and I suggest getting larger fuel injectors because you will likely run out of headroom above 5,000-5,400rpm when doing full throttle tuning.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
I took the stock measurements and added the bore, putting the numbers in a volume calculator and that's what I got. I'm putting wideband on this weekend. Glowshift air/fuel. I make the suggested adjustments and rescan after. Thank you
I looked at my notes and I never adjust the VE. it's like that in the base scan I did.
Find a stock 2002 Silverado VE table and paste that in there, that will give you a better starting point.
Cylinder volume should be around .67xxx if I'm just doing it in my head. A 5.7's is .70XXX and a 6.0's is .74594 or something similar to that.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
Cylinder volume should be .68007L for a .040 over 5.3L. Thats 3.820" bore x 3.622 Stroke
What camshaft?
My stock cylinder volume is 0.66594l. Stock 5.3 liters of fuel capacity with a stroke of about 3.6 inches and a bore of 3.8 inches. So if the stock bore is 3.8 and mine is bored .40 over, wouldn't the bore then be 4.2 inches? using this volume calculator https://www.omnicalculator.com/math/cylindervolume i get .82l for the volume. The Cam is a SUM-8720 from Summit Racing. Numbers in my VE are from the original stock scan.
3.78" bored .040" is 3.820 x Stroke 3.622" = 5.442L / 8 (cylinders) = 0.68025L per cylinder
I appreciate it Dan, that will help
Just installed the wideband o2 sensor and this is my latest scan. 22-12-02 11-13-30.hpl
22-12-02 13-48-13.hpl
Lastest Scan while driving. please be specific with advice cause I'm a rookie.
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