from the looks of the table i think he did. if it didnt get better with tuning i would imagine you have another problem and the cracked intake could be a good cause of it.

 

Anyone else with HPTuners who can read that file and see if anything looks wrong.

 

thats the file that came to me...the only thing i did with the throttle cracker was set it back to stock...again this is the file fran put together.

 

The car I tuned Saturday was actinfg like this and the
little smoothing I did on the throttle cracker airflow has,
I'm told, fixed the stalling / RPM diving entirely. You may
want to substitute this table just for something to try:

0.40039 0.50000 0.20020 0.59961 0.79980 0.79980 0.79980 0.79980 0.79980 0.79980 0.79980 0.79980
0.40039 0.50000 0.59961 0.79980 1.00000 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.40039 0.50000 0.65039 0.90039 1.00000 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.40039 0.50000 0.70020 0.90039 1.00000 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.40039 0.50000 0.70020 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.40039 0.50000 0.79980 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.50000 0.54980 0.79980 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.50000 0.59961 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.59961 0.65039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.65039 0.65039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.75000 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.75000 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.75000 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.75000 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.90039 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.90039 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961
0.90039 0.90039 0.90039 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961



Or this one, which is after multiple smoothing passes:

0.40039 0.50000 0.59766 0.68555 0.75098 0.78516 0.79688 0.79980 0.79980 0.79980 0.79980 0.79980
0.40039 0.51563 0.63965 0.76270 0.86230 0.92383 0.95117 0.95996 0.96094 0.96191 0.96191 0.96191
0.40039 0.53027 0.67285 0.81934 0.93750 1.01074 1.04395 1.05469 1.05762 1.05762 1.05762 1.05762
0.40332 0.54492 0.70215 0.85742 0.97852 1.04980 1.08008 1.08984 1.09082 1.09082 1.09082 1.09082
0.41211 0.56445 0.73340 0.89355 1.00879 1.06934 1.09180 1.09766 1.09863 1.09863 1.09863 1.09863
0.43750 0.59570 0.77051 0.93164 1.03516 1.08203 1.09668 1.09961 1.09961 1.09961 1.09961 1.09961
0.47852 0.63574 0.80957 0.96191 1.05371 1.08984 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.53027 0.67871 0.84180 0.98340 1.06445 1.09277 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.59180 0.72559 0.87109 0.99707 1.06836 1.09375 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.65527 0.77246 0.89844 1.00879 1.07129 1.09375 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.70801 0.81445 0.92383 1.01855 1.07422 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.74023 0.84180 0.93945 1.02441 1.07520 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.76563 0.85840 0.94824 1.02637 1.07617 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.80176 0.87695 0.95410 1.02832 1.07617 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.84863 0.89941 0.96191 1.02930 1.07617 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.88281 0.91602 0.96777 1.03027 1.07617 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961
0.90039 0.92383 0.96973 1.03027 1.07617 1.09473 1.09863 1.09961 1.09961 1.09961 1.09961 1.09961

 

Bump bump bump

 

one more shot

 

I had this same problem with my cam...I ended up putting the stock tuning in, and then making small changes and it idles just fine now...

The Idle Air in Gear, the scaling of VE by 70/80/90, etc.

 

What tuner did you use?

 

I used LS1Edit.

I also have been tuning my idle quite a bit tonight. I went back to the stock VE table, then scaled the 400/800/1200 columns by 85% and this nailed the A/F ratio...for the first 10 seconds...then it slowly climbs up. Not sure what I need to change for that.

 

Yeah look at the RAF/Desired airflow table, you might need more air at some points.
You might also be able to check out Idle Underspeed Error timing table to correct it before it goes too far out. The underspeed is a patch though, you are better to correct the actual error.
Do some idle tuning with RAF.

 

What would make the RPMs dip downn to 500 while coming to complete stops though?

 

Step 1: go back to the stock tune.
Step 2: set your absolute parameters:

• speed limiter
• gear/tire height changes
• turn off COT
• set your fan turn on temps, A/C stuff, etc
• turn off CAGS, or Torque Management (if M6 or A4)
• and so on

Save this tune so you can go back to it if needed.

Now do these steps *1 at a time* - this way you will learn what each of the tables affects...otherwise it will remain a mystery. After each change, fire the car up, drive it around the street/parking lot.

Step 3:
target A/F 15.1-1 for a smooth idle
For my heads/225 cam/exhaust car, that is scaling the VE table by 85% for the 400/800/1200 columns. Taking out too much VE seemed to make my car stumble. You have a *little* less overlap than me...so you might want to try scaling by ~87% first.

Also my stock VE for WOT was *really* close to ideal (my car ran 11:1 stock @ wot). I actually leaned it out 3% in the upper rpms.

Step 4: Idle Limiters --> IAC Park Position: Raise all points from 40C and up to 21
This sets the IAC base position. It is something that has to be matched to your car - but 21 is a high starting point.

Step 5: Idle Limiters --> Idle Air In Gear: All points 60C and up to 8.6

Take the car for a drive and check your idle. If the car goes on cruise control reduce the Idle Air in Gear Table .2 (further if necessary).

If the idle holds at 2000 RPM for extended periods of time reduce the P/N Airflow Decay table for all points above 10 MPH by 5% (multiply by 95) until this stops. Be very careful on this table.

This should get you pretty close.

-Aaron

 

Thanks!

 

i'm pretty much having the same issues but mine only does it when it is up to temp which is in the mid 180s.sometimes it will idle around 1500 rpms for around 5 seconds then go down to 900 rpms and sometimes when you stop it will go down to 500 rpms and sometimes dies.do i need to raise the iac count up also ?

 

Mine does it while warming up also, twice during initial warmup

 

In that file the throttle cracker enable/disable MPH
displays 200/199, so no cracker action for you. May
want to get it back in play and make more of a
linear taper to it, not the big "ridge" to stumble over.

Your idle/drive spark table is a whole lot lower advance
than your main spark table, for the 800RPM and 1200RPM
columns. I think making this table more like the main HO
would make your idle "tighter" and more able to tolerate
whatever blip is precipitating the problem.

As far as what that blip might be, my first suspect (say
it with me now) is sleepy O2 sensors that periodically
crash out, your fueling drifts off into the weeds, lather,
rince, repeat. To test this try just suppressing closed
loop and see how the idle stability is, then (presuming
your open loop fuel tune at idle is fairly close to stoich).

 

[QUOTE=jimmyblue]In that file the throttle cracker enable/disable MPH
displays 200/199, so no cracker action for you. May
want to get it back in play and make more of a
linear taper to it, not the big "ridge" to stumble over.

[QUOTE]




when it was set to normal it would stay at 2000 rpm while driving like u were on cruise control.... and setting it to that fixed it

 

I think there is probably a better compromise in there
somewhere.

 

Like what kinda compromise, everyday I'm ready to drive this thing into a wall.

 

one new thing I noticed today guys is that when the temps hit 100 degrees and the AIR pump turns off the idle dips EVERYTIME. AIR was removed along with EGR and blocked off at 3 points, 2 on pass. header, 1 on drivers side eader. Are there more blockoff sthen that for the AIR? Anything in the back? It seems weird that when the AIR pump goes off the idle dips, and it is consistent