idle surging/stalling 6.0 LS

[6.0jayy]

I have a sloppy stage 2 cam in my 2006 Silverado. After installing a 2800-3000 stall torque converter, the truck has had problems returning to idle when going slow and occasionally stalling. I raised the timing up in all 4 tables and its not stalling as much but it still does once and awhile and it still doesn't idle correctly. I noticed the idle advance is kicking in when the truck is idling causing it to idle between 14-29 degrees of timing rather than the demanded 22 degrees, and idea what is causing this? Cam specs are 228/230, 585"/.585" 112 LSA.

2006 chevy sioverado 2500 truck tune 1-24.hpt
2006 chevy silverado 2500 2-15 spark tables adjusted.hpl

[tana99ss]

i see youre in maf mod but you are not logging MAF Freq.

I would leave spark table alone for now and report back with a log.

Your Braf table looks on point for the most part, maybe small adjustment can be made.

[SiriusC1024]

Too much torque basically. Here are my suggestions. Adaptive idle threshold, rolling idle, spark tables.

[Alvin]

I have a sloppy stage 2 cam in my 2006 Silverado. After installing a 2800-3000 stall torque converter, the truck has had problems returning to idle when going slow and occasionally stalling. I raised the timing up in all 4 tables and its not stalling as much but it still does once and awhile and it still doesn't idle correctly. I noticed the idle advance is kicking in when the truck is idling causing it to idle between 14-29 degrees of timing rather than the demanded 22 degrees, and idea what is causing this? Cam specs are 228/230, 585"/.585" 112 LSA.

2006 chevy sioverado 2500 truck tune 1-24.hpt
2006 chevy silverado 2500 2-15 spark tables adjusted.hpl

You are on the right track.

There are idle spark compensation tables which will pull/add to your commanded spark.

I would set it up for 18 degrees then you can add up to 28-30 degrees (total) to save an idle dip and pull back to 5 or even lower to lower a flared idle.

In your base idle timing tables. I"d make the columns the same number all the way down. As the idle dips it will get into the .4 + g/cyl territory and beyond which has very low timing. Less timing on a dip is going to make the dip worse. It's ok having say 18 degress for the entire column in the base idle spark table because it is only used at idle.

[6.0jayy]

You are on the right track.

There are idle spark compensation tables which will pull/add to your commanded spark.

I would set it up for 18 degrees then you can add up to 28-30 degrees (total) to save an idle dip and pull back to 5 or even lower to lower a flared idle.

In your base idle timing tables. I"d make the columns the same number all the way down. As the idle dips it will get into the .4 + g/cyl territory and beyond which has very low timing. Less timing on a dip is going to make the dip worse. It's ok having say 18 degress for the entire column in the base idle spark table because it is only used at idle.

I understand what your saying in the last paragraph with pulling timing when the cyl/ airmass is dropping, but you confused me on the third paragraph you have, what table are u refering to add 18 degrees to and back down to 5?

[6.0jayy]

Too much torque basically. Here are my suggestions. Adaptive idle threshold, rolling idle, spark tables.

wrote this tune to the truck and it actually made it much worse as youll see in the log it stalled multiple times in a quick 5 minute drive.forum tune.hpl

[edcmat-l1]

wrote this tune to the truck and it actually made it much worse as youll see in the log it stalled multiple times in a quick 5 minute drive.forum tune.hpl

Post the tune file that goes with that data log.

[6.0jayy]

Post the tune file that goes with that data log.

https://forum.hptuners.com/attachmen...8&d=1708433454

[edcmat-l1]

Yeah I would not have made some of those changes.

[6.0jayy]

Yeah I would not have made some of those changes.

what do u suggest?

[SiriusC1024]

Hold on. It did what I wanted it to do. Idle doesn't hang anymore, and idle airflow corrections aren't fighting with spark as much.

Now it should be idling ok, but it isn't. Next is to address TCC. TCC DC min set to stock. Bluecat for shift points and lockup settings.

At least this is how I perceive the problem. In lieu of input from others maybe give this a shot. Might have to go up in idle spark, but not just yet.

[6.0jayy]

Hold on. It did what I wanted it to do. Idle doesn't hang anymore, and idle airflow corrections aren't fighting with spark as much.

Now it should be idling ok, but it isn't. Next is to address TCC. TCC DC min set to stock. Bluecat for shift points and lockup settings.

At least this is how I perceive the problem. In lieu of input from others maybe give this a shot. Might have to go up in idle spark, but not just yet.

Truck was still dying out when coming to a stop as youll see in the log in the first half, after the highway pull, it seemed to do it but much less. Transmission tune is much better shifts are more firm and much faster. In the first pull it goes into open loop and pulls a bunch of timing, any idea why? Thanks for all your help already, heres the log

forum tune log pt 2.hpl

[SiriusC1024]

Sometimes it returns to idle fine:
good tcc.png

Sometimes it doesnt:
bad tcc.png

Watch TCC Slip. How sure are you that the converter is good?

[6.0jayy]

Sometimes it returns to idle fine:
good tcc.png

Sometimes it doesnt:
bad tcc.png

Watch TCC Slip. How sure are you that the converter is good?

Not sure never a guarantee, i installed it along with the transmission myself always a chance i made a mistake.

[SiriusC1024]

It seems like the TCC is dragging RPM's down. A higher stall converter should be looser than stock. Not much you can do wrong as far as the TCC. If it's bad then it was a manufacturing defect. When this return to idle problem happens does the truck start bucking, or do you have to give more brake than normal?

What ATF?

4:10 gear ratio and 32.74" tire diameter correct?

[6.0jayy]

It seems like the TCC is dragging RPM's down. A higher stall converter should be looser than stock. Not much you can do wrong as far as the TCC. If it's bad then it was a manufacturing defect. When this return to idle problem happens does the truck start bucking, or do you have to give more brake than normal?

What ATF?

4:10 gear ratio and 32.74" tire diameter correct?

when this probelm occurs, if i give it gas while braking or "slip" the torque converter it keeps it alive. Im running dextron vi i believe and the tire size is correct, the truck came with a 4:10 lsd but i know the rear has been changed out im unsure of the ratio.

[SiriusC1024]

Well see what happens with more spark.

[SiriusC1024]

I think the clutch in the torque converter is dragging.

[6.0jayy]

I think the clutch in the torque converter is dragging.

would this be a bad torque converter basically?

[6.0jayy]

I think the clutch in the torque converter is dragging.

do u think low transmission fluid could cause this? I noticed there's a leak and the fluid was low yesterday