LQ9 Truck Norris cam lean off idle

[bennort199]

New to tuning, managed to get the truck to run and drive decent enough following some youtube videos and some data gathered off of the forums. Watching my ltfts seeing that they are getting on the lean side at about 1600rpm and higher. Short terms seem decent enough, have been adding into the maf freq tables to get more fueling. Wanted some input before I continue making changes blindly. Truck is an 05 silverado 1500 LQ9 with 317 heads, flex fuel injectors/rails from an 04 tahoe-p#12580426 (with fueling data copied over from a stock 04 tahoe flex tune) VE tables turned up from another post i saw on here for a similar cam. Cam Specs: 212/22X, .552/.552, 107 LSA INTAKE LOBE LIFT @ TDC: 0.05271. Stock truck intake and exhaust manifolds, still running converters with a flowmaster muffler. Stock air box/maf. 4.10 gears. Pulled spark timing back 5 degrees all around just to try and be safe for now? Let me know what im missing/have messed up. Did clear ltfts before this data log6.0 Idle Tune & ve altered.hptclinton drive 5.hpl

[blindsquirrel]

2005 Silverado LQ9 should be 'returnless' fuel system at 58psi, while 2004 Tahoe L59 should have been return/referenced at 51psi. Your fuel system should be the same as a 2005-up L59 so it should use injector data from 2005-up L59, it's very different from a 2004-down L59.

[bennort199]

Went back into the repository this morning and found I actually did use an 05 flex fuel tune. And yes I am using a "returnless" style fuel system, which is what was originally on the truck. Sorry for the false data. With this being the case what else should I look into to get fuel trims more balanced?

[gametech]

You need to actually tune it, not just paste in random stuff from the internet. It is obvious just by looking at it that the VE table you copied is garbage. That being said, the usual route is to disable the MAF and tune the VE, then reenable the MAF and tune it. However, you need to be logging dynamic cylinder air in order to see what your spark is doing. You have massive amounts of spark retard somewhere, but you are only logging rpm, so no way to tell at what load points it occurs. You should also log b1s1 and b2s1 o2 sensor voltages. There is a lot more, but that is a start.

[bennort199]

Okay, i was on vacation the past week and did not have a chance to do much, did disable maf and did some ve tuning. nothing crazy. went ahead and ordered a aem wideband. have it wired up to the pcm to run thru the egr, but being that i have mpvi3 the option is not available to me to turn the egr on. can someone turn in on in my file for me?6.0 Idle Tune & ve adjusted.hpt

[blindsquirrel]

https://forum.hptuners.com/showthrea...isible-P59-ECU

[bennort199]

Thanks!

[bennort199]

For anyone curious this is where my tune stands. Did maf and then ve, also have a wide band under EGR pid(AEM 30-0034). This log does not have a WO pull, will get one later today. Only notable issue is a surge at low speeds at about 1000 rpm, but assume this may be in the nature of the camshaft I have installed. 500 miles on build so far. Any input appreciated, was thinking about trying to add some timing today after I change my transmission fluid and filter this afternoon, not sure if I need to mess with PE as I have left it on this entire time already. Also wouldn't mind transmission shifting a bit nicer under WOT, hangs up for a bit if there is anything that could be done about that.
LQ9 TRUCK NORRIS WB VE MAF ACTIVE.hpt
6.0 T.N. WB MAF TUNED1.hpl

[blindsquirrel]

You might need to revisit the MAF since you did them out of order. Best to do VE first since depending on how fancy you got with your filters there could be some transient stuff that was affecting the MAF data collection.