Tuning for Mild Cam, Headers, etc....

[EagleMark]

Back in these old TBI trucks Ca had air pumps too and fed did not. I've also found WAY more Ca bin files superseded then feds. Guess they were never happy and always pushed...

Ca was always pushing vehicle manufacturers, funny how the state best known for hot rods... killed cars... well they killed themselves too!

[Davis_1377]

That looks pretty good! After I come up and stop it still stays at about 1200rpm and no way to get it back down unless I shut it off and start it back. I tried adjusting the screw again to get my IAC lower but it seems to not want to go under 39 steps.

[Fast355]

That looks pretty good! After I come up and stop it still stays at about 1200rpm and no way to get it back down unless I shut it off and start it back. I tried adjusting the screw again to get my IAC lower but it seems to not want to go under 39 steps.

I have had the high idle issue myself. I am trying to remember how I corrected it. IIRC it had something to do with the IAC logic and having to change some faulty values.

[gregs78cam]

That looks pretty good! After I come up and stop it still stays at about 1200rpm and no way to get it back down unless I shut it off and start it back. I tried adjusting the screw again to get my IAC lower but it seems to not want to go under 39 steps.

That's funny, I had the same problem with my '7427 in the camaro.....start up, idles good, put in gear and back to P/N and IAC/idle won't come back down, i think mine wouldn't go below 27 steps. I ended up switching to a Big Block bin to start, and all that went away, along with having a better spark map for my application.

[EagleMark]

That's funny, I had the same problem with my '7427 in the camaro.....start up, idles good, put in gear and back to P/N and IAC/idle won't come back down, i think mine wouldn't go below 27 steps. I ended up switching to a Big Block bin to start, and all that went away, along with having a better spark map for my application.

A lot of times that is do to "IAC - Position vs Temp" I cut them in half is usually enough.

[EagleMark]

That looks pretty good! After I come up and stop it still stays at about 1200rpm and no way to get it back down unless I shut it off and start it back. I tried adjusting the screw again to get my IAC lower but it seems to not want to go under 39 steps.

Everytime you adjust the screw you have to have the key off for...? 10 seconds, then turn back on and ECM will calculate 0% TPS position, this is not based on TPS voltage, this is always an issue if someone has foot on gas when starting too. If you change TPS% at throttle closed to other then 0% nothing works right.

I did make the IAC adjustments for this? What is your elevation? It may be do to Baro adjustment...

Also could be a faulty IAC, I've done a couple in last year my self that had IAC counts but pintle was not moving. It's a gear drive that wears out/stripped. See if your IAC drives all the way closed by shorting A and B on ALDL port, turn key on, no start, walk around to IAC and unplug it. Start motor and should idle much lower, while not running you can look down IAC port from top of TBI and see pintle seated. Should be no air going through this port with pintle seated.

[Davis_1377]

Yea i always leave the key off for awhile, I even leave it on for a little before starting it. I had the high idle after going to park problem with other bins too, the only time I didn't have it is when my spark wasn't advanced far, don't kno if that would lead to figuring it out. What do you use to make your spark tables they look nice and smooth. Anyway I can have the cammed lopey sounding idle with this tune also? I aint had much time to do the data tracing and stuff much yet. Im thinking about getting the Ostrich so I can do things more quicker and easier.

[EagleMark]

I saw the high idle in your other logs as well. Pretty sure it's not the bin, it's the same thing that drove me nuts on a vehicle, even after testing IAC and IAC wiring it still was happening. Replaced the IAC and it went away... month later same thing, different truck, replaced IAC and it went away. This time I tore apart the IAC to find it stripped in middle... Hope that's your issue.

There's a smooth tool in TunerPro, takes a little practice but works well, way easier to dial in issues and fuel VE tables when smooth.

You can get a lope with TBI at idle, have to run Open Loop Idle, then some playing with Idle RPM, fuel, spark idle bias etc... rev engine to dry out wet intake, test drive and see how it does when come to idle again. Have to keep the RPM up for cold starts, if you don't get it right it will load up after a couple minutes. Really a lot of work to make an EFI system run wrong and still run right off idle...

[Davis_1377]

Yea ive heard the IAC are bad about getting stopped up atleast on some vehicles. being stripped would make since why it wouldnt go past 39 steps, with A and B jumped over I could hear it buzzing constantly like it wasnt moving in either direction. When comparing the 2 bins, I see several "Item Not Defined" could I be using the wrong version of XDF? Im using $42-1227747-V5.1

I will be running your bin as it does really good.

[EagleMark]

I will be running your bin as it does really good.

Did you have doubt?

That is just a starter chip. If you read the thread we linked to earlier you'll find all the changes mentioned on how to start a chip for a built or big cam engine.

Yea ive heard the IAC are bad about getting stopped up atleast on some vehicles. being stripped would make since why it wouldnt go past 39 steps, with A and B jumped over I could hear it buzzing constantly like it wasnt moving in either direction.

Your supposed to hear the buzzing when it seats all the ay and is still being forced there. The one's I had did seat! But still got stuck/stripped in middle?

When comparing the 2 bins, I see several "Item Not Defined" could I be using the wrong version of XDF? Im using $42-1227747-V5.1

When you see that it means there are changes to hex and that hex does not have a Parameter for it. In this case it is the ESC Done and Lean Cruise patch applied. ESC Done stops the forced knock test. DO NOT enable Lean Cruise until you have a near perfect tune!