New cam - rich idle??

[Tomcat]

Hi guys!!

I just get installed new big cam to my LS6 and it works just fine...but the idle!!!

I think the big cam/overlap make the problem?? Engine can get air passing right though the cylinder into the exhaust making the WB say it lean when its really not....right??

There is lot of topics of the same problem but wich is the correct way to make idle right

[Bruce Melton]

Add air via b4307 and timing to ~24* across the 600-1200 table.
You also need to supply more info on your application.

[Tomcat]

Thanks Bruce!!

Here is some specs...

63 Corvette / LS6 2003 engine / T56 / Dana44 3.75 ( weight 2750lbs )

Engine

- Lightly ported stock heads
- Cam 228/230 .571/.573 112lsa
- Springs/retainers
- Mangnum pushrods
- Compression 10.8:1
- Thertmostat 180f
- Redline 6900rpm

Others

Efi-Live
Fuel reg ( 59psi )
Long tube headers
2 x 2.5" Exhaust / Borla mufflers ( No Cat )
C6 Vette intake / K&N panels

[Tomcat]

Add air via b4307 and timing to ~24* across the 600-1200 table.
You also need to supply more info on your application.

b4307 tuning helps a lot, but looks like PCM turn it back to rich after while...
How can I void that??

[Tomcat]

Now the AFR is OK, but I still have problem with idle...

Do I find the medic from Throtle cracker or Throtle flower table??

PLEASE HELP ME!!!!

[joecar]

Tomcat, welcome...

Someone who knows idle will chime in...

In the meantime, have you read this: showthread.php?t=4661

[Tomcat]

Tomcat, welcome...

Someone who knows idle will chime in...

In the meantime, have you read this: showthread.php?t=4661

WOW!!! Thanks joecar!!!

[SSpdDmon]

Yeah, you're going to need to tackle the fueling along with the pointers in that thread. Post up a copy of the tune and we'll get ya a starter file.

[Tomcat]

Yeah, you're going to need to tackle the fueling along with the pointers in that thread. Post up a copy of the tune and we'll get ya a starter file.

Thanks SSpdDmon!!! Here is link to my "base file"

http://www.saunalahti.fi/boiv/Z06%20gallery/ and there is BaseTomi Efilive file.

That file is used before new cam...and car works perfectly with that file.

[SSpdDmon]

Funny - it looks like you're running an '03 LS6 off of an '01 f-body file. Is there a reason for this? Are you running a cable between the throttle body and gas pedal (non-ETC setup)?