Chevelle LS1 Swap Idle Issues

[LastCall]

Helping a buddy out with his ls1 swapped chevelle. I followed the idle tutorial and tips and tricks and it idles decent. Engine is a 99 ls1 with 4l60e and small cam.

The issue is this - when you first start the engine, it runs and idles fine. However, soon as you put it in gear. It either stalls or begins to stumble. If you give it a little gas when you go from park to drive, it is fine. And once in gear, it is fine. It is the initial park to drive/reverse, that either kills it or causes a stumble.

What should I be logging or what tables in the tune. I have attached a few logs and the tune that is in the car.

Any help would be greatly appreciated!!

[joecar]

Look at B4307 Desired Airflow -> In Gear


Also, you're logging too many pid channels, reduce the pid channel count to 24 or less (otherwise it misses some of the data frames, look at your TP signal for example).

[LastCall]

Look at B4307 Desired Airflow -> In Gear


Also, you're logging too many pid channels, reduce the pid channel count to 24 or less (otherwise it misses some of the data frames, look at your TP signal for example).

Thanks JoeCar!

I did RAFIG this afternoon, but the numbers seem off. Based on the numbers, it wanted me to remove air. I am a bit confused. So the idle is better, but still stumbles going from park to drive.

Logs and current tune below. Does anybody see anything?

[picnic_george]

Also, you're logging too many pid channels, reduce the pid channel count to 24 or less (otherwise it misses some of the data frames, look at your TP signal for example).

You need to put this in your SIG lolol


Never near my laptop when I'm on here to look at a tune or log. But assuming your desired airflow is correct, what's your idle rpm and timing in gear?

[LastCall]

You need to put this in your SIG lolol


Never near my laptop when I'm on here to look at a tune or log. But assuming your desired airflow is correct, what's your idle rpm and timing in gear?

I didn't realized some data takes more than 1 channel of data. Duh!!

I have most of the timing tables right between 24-28 degrees low rpm/low air flow in base spark in gear, base spark in park, and low/hi octane tables. The stalling is the worst going from park to drive. It stumbles and/or dies.

[LastCall]

I added some more air into the desired air flow table. It is better but is stills stumbling and/or dying when going from park to reverse/drive. I have attached a copy of the latest tune.

Does anyone know where else I should look?

[statesman]

Set your O2 switch points {B4105} to 450.

Your VE table looks kinda high... did you tune that table with wideband or narrowband?

[LastCall]

Set your O2 switch points {B4105} to 450.

Your VE table looks kinda high... did you tune that table with wideband or narrowband?

I'll switch the 02 points as you suggested.

I took 10% out of the VE below 1200 as a starting point from stock tune. I think I need to spend some time redoing it, at least in the 4,8, and 1200 rpm cells.

I created a MAP to look at grams per second vs ECT, and the values seem very high.

At 176 degrees - 19.29
At 198 degrees - 21.52

Something seems wrong with those numbers, especially since the desired air flow is around 8-9 at those temperatures.

[statesman]

Those numbers look a bit wild. Is everything swapped over from the same donor or is this a frankenbuild?

[LastCall]

Those numbers look a bit wild. Is everything swapped over from the same donor or is this a frankenbuild?

It's a been of a frankenbuild. Lol

Has a new psi harness... Started with an 02 truck tune. Maf scaling is stock 02 5.3. I did change the injector flow rates since the car has an ls6 manifold with the 28.5 injectors and corvette fuel filters. Copied 02 corvette flow rates since the injectors are not referenced to vacuum.