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

[EagleMark]

Considering Jet sucks and it's a Ca bin, that's out... ACSF was superseded twice to AMUR which is a good one, So I'll do my favorite... ADSU!

EDIT: I wanted to see what you were doing so I can help?

[EagleMark]

Give this a shot and get a data log.

EDIT: Stock for compare.

[Fast355]

Considering Jet sucks and it's a Ca bin, that's out... ACSF was superseded twice to AMUR which is a good one, So I'll do my favorite... ADSU!

EDIT: I wanted to see what you were doing so I can help?

I have compared Federal and CA binary files before and generally CA has a richer O2 target voltage, slightly retarded ignition timing (especially during warmup)and delayed torque converter lockup. Baically looks like they were trying to warmup the cat quicker and reduce NOx emissions. To clean up the extra hydrocarbons they blew air into the manifolds in open loop warmup to help preheat the cat and then diverted it into the cat with a warm engine.

[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 I've also found WAY more Ca bin files superseded then feds.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...