TPS goes to 14% after start-up

[LaTechGTO]

No matter if I max out the start-up and the minimum airflow table, the TPS goes to 14% and eventually kills the engine. I've never ran across this before and am quite baffled. You can see the spark keeps increasing to reach target idle, but that's not enough.

2007 Suburban (e38/t42)
5.3/4L80E
SD
FIC 1000cc Injectors
Flex
On3 76mm

V2.4 SA_RAF.hpt
21-08-04 20-00-13.hpl

Edit: I can feather the throttle to keep it running. Once it's warm, the idle is good, and it drives great.

[Lakegoat]

Is your injector off time supposed to be 0 ?
IVT Terms (AFR Term) needs to be halved for the double stoich.
Base running airflow looks high to me unless you have a donkey cam.
Normally if doesn't run well in open loop and it runs good in closed loop, you need to adjust the VE table.

[LaTechGTO]

Is your injector off time supposed to be 0 ?
IVT Terms (AFR Term) needs to be halved for the double stoich.
Base running airflow looks high to me unless you have a donkey cam.
Normally if doesn't run well in open loop and it runs good in closed loop, you need to adjust the VE table.

Never touched that table. Maybe the previous tuner??

At any rate the TB closing to 14% no matter the RAF or SU Air does not make sense to me. I made a note to verify the MAF is failing correctly bc when I was brainstorming earlier, I do not recall seeing a CEL.

Cam is similar to a SS2.

Just stating OL vs CL Diff - the adaptive idle TB portion seems to work in CL and not in OL for some reason.

This is a VERY base tune to get it going. So far, I have only adjusted idle and adjacent cruising cells to get the fueling correct.

[LaTechGTO]

Another evening of troubleshooting. No matter what I do, the TB goes to 14% directly after it fires up, causing the RPMs to drop and kills the engine. It's almost like there's a ceiling on the max TB opening during idle despite making huge swings in the minimum running airflow table as well as the multipliers. Any advice?

[kevin87turbot]

Another evening of troubleshooting. No matter what I do, the TB goes to 14% directly after it fires up, causing the RPMs to drop and kills the engine. It's almost like there's a ceiling on the max TB opening during idle despite making huge swings in the minimum running airflow table as well as the multipliers. Any advice?

Go to the Engine Tab>Idle>Airflow and increase the Max Fail Effective area to 8191.
Go to the Engine Diagnostics Tab>Airflow and 0 the Test ERT Min and the Test Enable Delay.
That will ensure that it fails the MAF right away.

[LaTechGTO]

Go to the Engine Tab>Idle>Airflow and increase the Max Fail Effective area to 8191.
Go to the Engine Diagnostics Tab>Airflow and 0 the Test ERT Min and the Test Enable Delay.
That will ensure that it fails the MAF right away.

Thanks! Just adjusted the tune. I?ll it that in the morning while my neighbors are waking up. 3.5? dump right off the turbo should sound pretty good?

[LaTechGTO]

Go to the Engine Tab>Idle>Airflow and increase the Max Fail Effective area to 8191.
Go to the Engine Diagnostics Tab>Airflow and 0 the Test ERT Min and the Test Enable Delay.
That will ensure that it fails the MAF right away.

The Max Fail change did it! Thanks again!

Also, I should learn to read table descriptions. Says it right there - if you fail the MAF, the value is the Max area?

[kevin87turbot]

Good deal. Thanks for the update!