Idle Problem Help Please

[Duramax 6.6L]

I am in the middle of a project that I just got stuck with.

The vehicle is a 2000 Camaro with a built engine. The engine has ported heads with a comp cams thumper cam I believe 109 separation with 282/303 duration and 227/241 at .050, aftermarket intake, headers.

This engine will not idle at all, if started engine just dies. If I hold throttle open I can get the car to stay running but must be held above 1000 rpm. I can not get the car to idle to perform the the logs.

I have attached the file from the car. Any help to get to idle and tuned would be greatly appreciated.

Thank you for your help in advance.

[joecar]

Idle tuning has many aspects, there's a lot of reading:



Idle Tuning
showthread.php?4661-Idle-Tuning-Helpful-Info-Inside (http://forum.efilive.com/showthread.php?4661-Idle-Tuning-Helpful-Info-Inside)
showthread.php?14439-Idle-Tips-amp-Tricks (http://forum.efilive.com/showthread.php?14439-Idle-Tips-amp-Tricks)
showthread.php?5866-Auto-VE-questions (http://forum.efilive.com/showthread.php?5866-Auto-VE-questions)
showthread.php?14153-scan-tool-wont-log-rafig-or-rafpn (http://forum.efilive.com/showthread.php?14153-scan-tool-wont-log-rafig-or-rafpn)
showthread.php?14435-Need-help-Can-Start-Car-but-dies-when-I-give-it-any-throttle-before-going-to-CL (http://forum.efilive.com/showthread.php?14435-Need-help-Can-Start-Car-but-dies-when-I-give-it-any-throttle-before-going-to-CL&p=129519&viewfull=1#post129519)
showthread.php?7011-ETC-cars-and-IAC-parameters (http://forum.efilive.com/showthread.php?7011-ETC-cars-and-IAC-parameters&p=61455&viewfull=1#post61455)
showthread.php?14544-Working-on-my-idle-tune (http://forum.efilive.com/showthread.php?14544-Working-on-my-idle-tune)
showthread.php?14794-Help-with-open-loop-%28cold-start%29-tuning (http://forum.efilive.com/showthread.php?14794-Help-with-open-loop-%28cold-start%29-tuning&p=133446#post133446)
showthread.php?149-Idle-%28Transition%29-Tuning (http://forum.efilive.com/showthread.php?149-Idle-%28Transition%29-Tuning)
Stumble-3-seconds-after-cold-start&p=178921#post178921 (http://forum.efilive.com/showthread.php?14144-Stumble-3-seconds-after-cold-start&p=178921#post178921)
Idle-Tips-amp-Tricks:post#46 (http://forum.efilive.com/showthread.php?14439-Idle-Tips-amp-Tricks&p=193144&viewfull=1#post193144)

More Idle Tuning
showthread.php?t=149 (http://forum.efilive.com/showthread.php?t=149)
showthread.php?t=5866 (http://forum.efilive.com/showthread.php?t=5866&highlight=RAFIG)
showthread.php?p=86553 (http://forum.efilive.com/showthread.php?p=86553) post #17
showthread.php?t=2630 (http://forum.efilive.com/showthread.php?t=2630)
showthread.php?t=473 (http://forum.efilive.com/showthread.php?t=473)

Throttle Cracker/Follower
showthread.php?t=3568 (http://forum.efilive.com/showthread.php?t=3568)
showthread.php?t=4081 (http://forum.efilive.com/showthread.php?t=4081)
showthread.php?t=5406 (http://forum.efilive.com/showthread.php?t=5406)
showthread.php?t=5940 (http://forum.efilive.com/showthread.php?t=5940)

[Duramax 6.6L]

Thank you for your help

I have been reading all these

Post #17 says to set to these values

{B4322} Idle Learn P/N Limit High 8
{B4323} Idle Learn P/N Limit Low - 8
{B4331} Idle Learn P/N A/C On Limit High 8
{B4330} Idle Learn P/N A/C On Limit Low -8
{B4324} Idle Learn Drive Limit High 8
{B4325} Idle Learn Drive Limit Low -8
{B4329} Idle Learn Drive A/C On Limit High 8
{B4328} Idle Learn Drive A/C On Limit Low -8

EFI Live will only let set to 4.23 or -4.23

Any ideas on this

[macca_779]

I leave those parameters standard. Learning is only needed if the base values are way off

[turbo_bu]

As you have probably been reading, the main thing will be to try and get the airflow value half way close. If your still running a MAF, you can at least see about how much airflow you need for "idle" by holding the throttle and keeping it running at 1000 RPM. The actual amount of air for a lower idle speed will be a little lower, but it could serve as a starting point. If your running SD (no MAF), you can still find amount how air is necessary, but just need to record a few more PIDs (IAT, MAP, RPM) to calculate that value. The formula for calculating airflow for a SD setup are in those tutorials.

[macca_779]

As you have probably been reading, the main thing will be to try and get the airflow value half way close. If your still running a MAF, you can at least see about how much airflow you need for "idle" by holding the throttle and keeping it running at 1000 RPM. The actual amount of air for a lower idle speed will be a little lower, but it could serve as a starting point. If your running SD (no MAF), you can still find amount how air is necessary, but just need to record a few more PIDs (IAT, MAP, RPM) to calculate that value. The formula for calculating airflow for a SD setup are in those tutorials.

Or log RAFIG and apply the logged error to desired air

[ddnspider]

Like others on this site have already found, logging RAGIF may product airflow values too low. Get the MAF or VE dialed in and then do a histogram of the airflow and copy that into the desired airflow tables.

[statesman]

I am in the middle of a project that I just got stuck with.

The vehicle is a 2000 Camaro with a built engine. The engine has ported heads with a comp cams thumper cam I believe 109 separation with 282/303 duration and 227/241 at .050, aftermarket intake, headers.

This engine will not idle at all, if started engine just dies. If I hold throttle open I can get the car to stay running but must be held above 1000 rpm. I can not get the car to idle to perform the the logs.

I have attached the file from the car. Any help to get to idle and tuned would be greatly appreciated.

Thank you for your help in advance.

I just had a quick look at your tune file and your Desired Airflow and Desired Idle Speeds tables look stock. You're going to need more idle airflow and a higher idle speed with that cam. Your IAC effective area table also looks stock. Have you drilled or cracked your throttle blade?