83 c10 with 02 5.3 cammed

[jchristian24]

I've got a 02 avalanche 5.3 completely stock other than btr truck norris cam. Cant seem to get the tune dialed in. Runs ok driving idle isnt terrible but sometimes stalls when going from park to gear or a quick on off throttle situation like pulling out of neighborhood and a car comes last minute sometimes makes it stall. I think timing airflow and ve tables are good or close at least but have had some issues with disabling maf to tune where it doesnt want to hardly run. I'm no pro by any means so maybe someone with more experience can tell me what I'm missing.

c10 modded.hpt
c10 log.hpl
c10 stall.hpl

[Jakeallred]

pull a stock ve table off the tune repository for a 02 5.3. you will find that your current ve is dramatically smaller than the stock one!

[jchristian24]

Even with it smaller I?m still getting rich signals. I?ve noticed I?ve had to lower it drastically as well. I?ll try that and start fresh with it though.

[5FDP]

If you had to lower it that much, you have other problems you are trying to cover up.

First thing I noticed was your MAP sensor settings, there is no GM sensor that runs those settings. So put those back to stock if you are running a stock MAP from a 2002 truck.

Second thing is your stoich ratio. Standard pump gas is 14.68, E10 would be roughly 14.1. So pick one of those two for whichever fuel you are running.

Double check your fuel pressure too, if your pump is pushing past say 58psi, you will be chasing your tail.

[jchristian24]

I?ll check the fuel pressure in the morning. It?s an aftermarket pump but I don?t know much about it. If it?s over 58 then what? And I adjusted the map cause it kept coding out cause it was hitting higher map numbers than the factory settings. What would cause that? Should I get a factory tune from repository and start from scratch? If I do what would be the recommended starting points?

[reubone]

c10 Return to Stock.hpt

That is a return to stock file for the engine side that keeps everything else the same. After you have verified the fuel pressure, Set the idle speed up and start from here possibly.

[jchristian24]

I?ll try that thanks man

[edcmat-l1]

First off, you don't have it in speed density so you shouldn't be modifying the VE. Put that back to stock, fail the maf, set your P0101-103 codes to MIL on first error, copy and paste your high octane spark table into your low octane, zero out the MAF table THEN you can start monkeying with your VE.

[jchristian24]

First off, you don't have it in speed density so you shouldn't be modifying the VE. Put that back to stock, fail the maf, set your P0101-103 codes to MIL on first error, copy and paste your high octane spark table into your low octane, zero out the MAF table THEN you can start monkeying with your VE.

I will give it another shot but everytime i have tried to fail the maf the truck wont hardly let me touch the gas at all with sputtering and acting crazy. i havent made anymore adjustments since i reenabled the maf but i am definitely going to be putting everything back stock and trying to go step by step with the advice you guys have given so far and hopefully make some progress. thank yall for helping so far and hopefully ill have a better log to upload soon.

[jchristian24]

Loaded the stock tune and it does ok have to open the throttle a bit for it to start and needs some adjustments on how it returns to idle when coming off throttle to come to stop or when revved in park but for the most part it did well. Only thing i have done so far is disable stft dfco and cat overheat. When i fail the maf it wont run at all so need some pointers on what to do there. Im only able to tune ve using the narrowband currently so trying to use the ltft to do that but need to fail the maf first. Any pointers to get me headed in the right direction from where i am would be greatly appreciated.

c10 back stock.hpl

c10 Return to Stock2.hpt

[horsepowerguru427]

Loaded the stock tune and it does ok have to open the throttle a bit for it to start and needs some adjustments on how it returns to idle when coming off throttle to come to stop or when revved in park but for the most part it did well. Only thing i have done so far is disable stft dfco and cat overheat. When i fail the maf it wont run at all so need some pointers on what to do there. Im only able to tune ve using the narrowband currently so trying to use the ltft to do that but need to fail the maf first. Any pointers to get me headed in the right direction from where i am would be greatly appreciated.

c10 back stock.hpl

c10 Return to Stock2.hpt

Its not going to want to run because its not calibrated for the new setup yet. You probly need to lower the idle VE area some. Higher performance cams will lose efficiency down low. Go to your BRAF or idle RAF and multiply the whole table by 1.5 for now. take idle rpm up to at least 900 everywhere on the table. Get it to idle and take that info from the histogram and use it to alter the VE table. Cranking VE should match regular VE so once your idle VE is in the ballpark then copy the corresponding cells over to the cranking VE table and interpolate the missing info. Heres a link thatll walk you through SD setup and should get you further than where youre currently at.
https://forum.hptuners.com/showthrea...e-(w-pictures)

[jchristian24]

Its not going to want to run because its not calibrated for the new setup yet. You probly need to lower the idle VE area some. Higher performance cams will lose efficiency down low. Go to your BRAF or idle RAF and multiply the whole table by 1.5 for now. take idle rpm up to at least 900 everywhere on the table. Get it to idle and take that info from the histogram and use it to alter the VE table. Cranking VE should match regular VE so once your idle VE is in the ballpark then copy the corresponding cells over to the cranking VE table and interpolate the missing info. Heres a link thatll walk you through SD setup and should get you further than where youre currently at.
https://forum.hptuners.com/showthrea...e-(w-pictures)

I appreciate the pointers on that i got it to fail maf and run good enough to drive and ive adjusted the ve twice so far. Going for another drive shortly. Havent messed with any BRAF or timing as of yet so start up and coming to stops is a little rough for now but figured if i can get the ve table dialed in the rest will fall together pretty well. I will post my tune and log after the ve gets a little closer and see if any of you guys have advice on the next steps to get the idle dialed in and hopefully bring out that idle chop more than it is now. I really appreciate everyone that has helped thus far.

[horsepowerguru427]

I appreciate the pointers on that i got it to fail maf and run good enough to drive and ive adjusted the ve twice so far. Going for another drive shortly. Havent messed with any BRAF or timing as of yet so start up and coming to stops is a little rough for now but figured if i can get the ve table dialed in the rest will fall together pretty well. I will post my tune and log after the ve gets a little closer and see if any of you guys have advice on the next steps to get the idle dialed in and hopefully bring out that idle chop more than it is now. I really appreciate everyone that has helped thus far.

This might help you when you get to idle tuning. https://www.performancetrucks.net/fo...tricks-373848/

You can also loose up your adaptive idle timing. Proportional can go from "25" to "50" or "60" or something in between and Integral can be dropped from "10" to "5". Might allow it to chop a little more at idle.