02 5.3 turbo rich idle

[silverustoturbo]

Hello all I am very new to tuning and I don't know really anything about it so thats why i paid someone! unfortunately, he was unable to finish the tune so here I am with a half-done tune that runs and drives but AFR drops down to 11.9 at idle when stopped, does the same with very light throttle inputs, and when letting off the throttle. I'm experienced with the mechanical portion but a total newb when it comes to tuning or most Hp tuners related things. I have noticed the average injector pulse width does not drop below 1.8ms?? I have tried adding SD AEM AFR/ EQ on the channels, but it never sticks, below are details of the truck.
02 silverado with 5.3 with gen4 internals, manual trans swapped,
Stage 1 btr cam (specs below),
deatschwerks 95lb injectors (PN:17U-05-0095-8) with flow report,
vs racing 7875 .96ar t4,
walbro 450 FP.

cam specs.png
rich driving.hpl
rebuilt5.3 (DO NOT EDIT).hpt
rebuilt5.3 trying to fix rich idle problem.hpt
injector data.png
1000cc injectors.png
rich even earlier with throttle.hpl

[04silverado6.0]

I think your ve looks a little high in the low speed area. You will probably find a point to where you reduce the ve but the wideband stays rich. Them large injectors can only go so low on pw before they quit firing. Make sure you input complete injector data.

[rabbs88]

Sorry to be the bearer of bad news but that tune needs a ton of work. Like you would be better to start from scratch. You might want to consider finding another tuner that's a bit more reputable. I hope you have your stock tune because the one you posted is a custom OS

[blindsquirrel]

Returnless/non-referenced fuel system in a 2002? What's the fuel pressure?

[edcmat-l1]

450 pump in a returnless system, the pressure is probably through the roof.

Min pulse width looks too high for that big of an injector.

Transient min fuel mg is too high.

VE is too high.

[Alvin]

Hello all I am very new to tuning and I don't know really anything about it so thats why i paid someone! unfortunately, he was unable to finish the tune so here I am with a half-done tune that runs and drives but AFR drops down to 11.9 at idle when stopped, does the same with very light throttle inputs, and when letting off the throttle. I'm experienced with the mechanical portion but a total newb when it comes to tuning or most Hp tuners related things. I have noticed the average injector pulse width does not drop below 1.8ms?? I have tried adding SD AEM AFR/ EQ on the channels, but it never sticks, below are details of the truck.
02 silverado with 5.3 with gen4 internals, manual trans swapped,
Stage 1 btr cam (specs below),
deatschwerks 95lb injectors (PN:17U-05-0095-8) with flow report,
vs racing 7875 .96ar t4,
walbro 450 FP.

cam specs.png
rich driving.hpl
rebuilt5.3 (DO NOT EDIT).hpt
rebuilt5.3 trying to fix rich idle problem.hpt
injector data.png
1000cc injectors.png
rich even earlier with throttle.hpl

This is the second time this week I've caught this for someone..

In GEN 3's there is two min PW settings that MUST BE changed when doing large injectors. Some people preach to modify this.. I've never had a issue zeroing them out completely.

Try this.. It will change your low load fueling by a lot.. so you'll have to go back and retune this but at least you'll get under that 1.8ms pulse width cap.


rebuilt5.3 trying to fix rich idle problem - ALVIN.hpt

[Alvin]

Also the map sensors settings you are using do not match anything I have references too.. Which PN sensor are you using.

https://www.pcmofnc.com/2020/03/12/g...r-2-bar-3-bar/

[silverustoturbo]

Thanks all for the quick responses. Hopefully this tune isnt a total waste of time seeing how i paid to have it done and ive put alot of time and $$ this turd! For the fuel system it's a walbro in place of the stock pump and other than the injectors everything else is stock in the fuel system including rails and regulator. Alvin ill give it a shot! The map sensor is from EFI source its a "truck style" ls3 3 bar with linear of 305 and offset of 10.33.

[blindsquirrel]

If your fuel rails/regulator came from a 2002 truck, and those rails have a feed line from tank to rail and a return line from rail to tank, and there is a little vacuum hose going to the top of the pressure regulator, then your injector data is wrong. You have data for a returnless/non-referenced system.

[silverustoturbo]

blindsquirrel please elaborate tune wise.... i know i have a fuel return on the truck itsself but whats going on with the tune??

[silverustoturbo]

2002 stock.hpt this was what was used to create my tune after engine rebuild. long story short a lot of things have happened with this truck and the stock tune was lost when the original ecu took a dump.

[blindsquirrel]

returnless.png referenced.png

rebuilt5.3 trying to fix rich idle problem - referenced injector data.hpt

[silverustoturbo]

soooo a flow rate vs kpa that isnt the same across indicates the tune was set up for a returnless fuel system?? anybody got some videos i could watch or articles i could read to gain a better understanding of this wizardry? Should i give that tune a shot without the inputs alvin gave or should i try them together? Remember i am a complete novice for tuning lol but i understand mechanical.

[blindsquirrel]

Use the file with the correct injector data. Open Alvin's file using 'Compare'. Do 'Copy Selected Differences' for anything he changed that ISN'T under 'Injector Control'.

Or do the opposite, open Alvin's file, do the same stuff, but copy over ONLY the stuff in 'Injector Control' (should be only 3 items).

[blindsquirrel]

https://injectordynamics.com/article...ure-explained/

[Alvin]

I'd be wary of aftermarket map sensors. There is a turbo company that sells one. I've had several come by the shop and all of them were bad.

[edcmat-l1]

Agreed ^^^ No reason to use anything but AC Delco or GM OEM.

[silverustoturbo]

alvin i have had great luck with it so far i had it on pre-engine rebuild/new injectors combo for about two years. what would be a good map that i could put in the stock spot and would i have to do a whole new tune? So heres the results of the Alvin/blindsquirrel combo and overall great improvement. It still gets very rich (9.9-11.0 rich) when rolling idle (in neutral/ foot on the clutch) and it also goes up to 1100-1200 rpms? when first stopped it will get very rich and slowly come back up. For some reason its somewhat rich (12.50-13.0) until you crawl forward in first then it will correct itself.... most of the time.postalvinandblindsquirrel.hpl

[Alvin]

After the changes I recommenced you would need to go back over the tune.

Again I'd be wary of any map sensor that wasn't an OEM GM part.

[silverustoturbo]

I still have the same problem of rich when you let off the throttle if anyone else has more input or has had the similar issues.