ls2 bait

iTrader: (11)

on initial start up the car is basicly imobile for 10-15 seconds until the pcm fails the maf sensor. car is sd tuned with stock map sensor. 99 fbody. car was tuned previously by another tuner (with diff program) on old motor combo in sd and i didnt have this issue. i could hop in and drive. now i cant even turn the a/c on until the maf fails or it will stall. also its running damn good now driveability wise but has stalled a couple times. if i fire it right back up it gets bitchy and wants to stall again. if anyone has any ideas on these help a brother out

foff667

iTrader: (2)

The maf should fail instantly as long as the dtc's & maf fail freq tables are setup correctly.

ls2 bait

iTrader: (11)

any tips on what to look for? must be missing something.

405HP_Z06

iTrader: (11)

Post your tune, please.

ls2 bait

iTrader: (11)

ill try and get it posted up later. its not on my cpu as im not the one whos strokin the keys

edcmat-l1

iTrader: (10)

And a run log too would be helpful. From start up.

TAQuickness

iTrader: (28)

From the Scan or Tune tool, click Help -> Tutorials -> AutoVE. Run thru the section that has you set up the tune. Likely culprit is the MAF fail count.

ls2 bait

iTrader: (11)

here you go let me know if this works.

ls2 bait

iTrader: (11)

bump. did the attachment work?

Haans249

iTrader: (24)

Modification summary: 12:00:15 pm, Wednesday Jun 04, 2008

Engine Calibration.Spark.General
{B5914} Spark Low-Octane Table, modified.
{B5932} Base Spark in Gear, modified. (pasted w/ labels the spark table here, improves driveability)
{B5933} Base Spark in Park/Neutral, modified. (pasted w/ labels the spark table here, improves driveability)

Engine Diagnostics
{C6002} Engine DTC MIL Enablers, modified. (disabled)

Engine Diagnostics.MAF
{C2902} MAF High Frequency Fail 2, changed from "14000" to "1".
{C2903} MAF High Frequency Fail Limit, changed from "6.0" to "1.0".

These modifications should set you off. Also, on a side note, this tune is still setup under the assumption that you're running a 5.7L motor...the
cylinder volume {B0104} is still at the stock setting. Also, whenever you change the Spark Tables, you need to copy w/labels your High-Octane table (where
you make changes) and paste w/lables into your Spark Low-Octane Table and your Base Spark Tables. When in SD your tune will revert to the Low-Octane Table. Let us know how it works. Do you have a wideband O2 hooked up?

Best Regards,
Adrian

ls2 bait

iTrader: (11)

i dont keep one in the car but their is one in when it is being tuned.

gojo

iTrader: (12)

This should fail the MAF.

Engine Calibration.Fuel.Mixture
{B3618} PE Modifier Based on RPM, modified 14.63.
Engine Calibration.Fuel.Trim
{B3801} Long Term Fuel Trim Correction, changed from "Enable" to "Disable".
Engine Calibration.Fuel.Trim
{B4108} STFT Idle Enable, changed from "Enable" to "Disable".
Engine Calibration.Fuel.DFCO
{B3313} DFCO Temp Enable, changed from "30.0" to "122.0".
Engine Calibration.Fuel.O2
{B4205} Closed Loop Temp Enable, modified 122C.
Engine Diagnostics. Processing enablers
{C6002} Engine DTC MIL Enablers, modified P0101, 0102, 0103, no mil.
Engine Diagnostics.MAF
{C2901} MAF High Frequency Fail 1, changed from "13500" to "1".
{C2903} MAF High Frequency Fail Limit, changed from "18.000000" to "1.000000".
Cat Converter.
{B0701} Catalytic Converter Protection, changed from "Enable" to "Disable".

Haans249

iTrader: (24)

Alright cool, go ahead and try that tune, it should work fine for you.

gojo: His tune indeed didn't have the PE modifier set to 14.63, but since he's been running with it the way it was, I just left it, only thing I changed for him was the base spark tables, and the MAF fails, so he will be go to go.

let us know how it works!
Adrian

ls2 bait

iTrader: (11)

will try and give it a shot this weekend, thank you. ill post back results or anything else we come up with

Haans249

iTrader: (24)

How did it work?

ls2 bait

iTrader: (11)

didnt get to try it. got tied up. going to try it on weds hopefully. also while i have your attention my previous tuner seems to have disabled my ability to track misfires somehow. i cant even see them on a tech 2. what could they have done to do that? and how the hell would i fix it?

Haans249

iTrader: (24)

When you have a cammed motor, it normal to disable the cylinder misfire detection because most cammed vehicles misfire at idle, hence a "lopey" cam etc... Only reason to disable it is so you don't have that annoying flashing service engine soon light. I've got mine disabled as well, with not a single problem. If you really want to re-enable it, I can step you though it, its really simple.

Haans249

iTrader: (24)

Also, i see you have your idle set at 1000 rpms...I have a 427 LS7 hefty cammed motor running an even 750 rpms at hot idle. Once we get your idle squared away, I can step you through the process of effectively bringing your idle back down to sanity. Care to share cam specs with me? You can shoot me a PM, some cams will be more difficult to idle down then others. Lastly, do you have a breather hole in your throttle plate? If you could do a start up log from cold to hot and shoot it my way with the following PIDs that would be sweet! I'm assuming you're running an LC1? Just load this PID file in EFILive Scan. Just change the .zip to .pid

Goldfinger911

iTrader: (24)

I noticed he is running a 90mm TB and the IAC Effective Area is set up for a 78mm TB. This will hurt idle, especially on a cammed LS. After this is changed, he needs to redo RAFIG to get desired airflow at idle.

2002_Z28_Six_Speed

iTrader: (19)

I would say the min spark table is not helping him.
He needs more in the spark timing while cranking table.