Cascade Crew

BluFbdy · Posted: Mon Oct 15, 2012 1:56 pm Post subject:

True but I'm switchingto speed density anyway lol once its all good I'm gonna go for the ebl p4

Twilightoptics · Posted: Mon Oct 15, 2012 3:00 pm Post subject:

Tbi. IS. Speed density.

BluFbdy · Posted: Thu Oct 18, 2012 8:08 pm Post subject:

True. Lost in translation I refer to tbi as toilet bowl injection, 8(?)-89 tpi as MAF and the 90-92 tpi as speed density, that's a personal thing.

In any case I got a good tps sensor today, adjustable one at that, and it didn't help at all. I'm really confused at this point, i would replace the cts but its on point according to the datalog, for no apparent reason I metered the IAC green wires and both were at 13.xx volts Idk what the next trouble shooting step would be here. Any thoughts?

MrMike98 · Member Joined: 18 May 2010 Posts: 231 Location: Bremerton

Is there a "Minimum Idle air Adjust"?
on my TPI SD i can adjust min. idle air to achieve IAC counts of around 20 at idle..
this puts IAC valve in the middle of its control range---

just a random thought....

BluFbdy · Posted: Fri Oct 19, 2012 12:10 pm Post subject:

I've set minimum air so many times its not even funny at this point

Twilightoptics · Posted: Fri Oct 19, 2012 4:34 pm Post subject:

Something is telling the ECM information that the ECM determines it needs the IAC open for.

Is the AC flag checked?
What does the RPM say when it's idling high on the datalog? Does it match the tach?

I would try closing the throttle blades more. IIRC TBI takes a TPS reading from key on each time and sets that as (zero)

BluFbdy · Posted: Fri Oct 19, 2012 5:22 pm Post subject:

Rpm is 1125 when tach is reading 1500, 1550 when the tach reads 2000.

By ac flag you mean the ecm sees the ac is on? I have no ac I just use the switch to kick my fan on and its been like that since I bought the car.

Now that I look at it the iac is showing the steps at 34, ill reset minimum air and see what I find

BluFbdy · Posted: Fri Oct 19, 2012 5:37 pm Post subject:

Well that was a fluke. I ran a datalog right after the minimum air setting at it was at 725, shut the car off and started it right back up to 1250 Mad

this is seriously getting under my skin its not making a damn bit of sense to me.

aaron_sK · Posted: Fri Oct 19, 2012 9:44 pm Post subject:

Are you adjusting the minimum air while watching the IAC steps to get it in the right spot?

BluFbdy · Posted: Fri Oct 19, 2012 10:06 pm Post subject:

I have to jump the aldl to adjust minimum air, so I couldn't plug the cable in at the same time without possibly causing some adverse effects, unless tunerpro has a ground button I missed lol and my minimum air has always been based off of rpm not off of iac steps, that part just took over automatically before

aaron_sK · Posted: Fri Oct 19, 2012 10:12 pm Post subject:

You can set it with the car running. Just adjust the stop until the IAC count comes into line and then shut it off and readjust the TPS.

BluFbdy · Posted: Sat Oct 20, 2012 5:30 am Post subject:

I thought you had to have the aldl grounded to make any changes to iac like the est wire works for timing, if that's grounded with a jumper then I can't stick the cable into the port.

Quick question does a cts reading show up on the line graph in tunerpro? Mine is only showing a number not creating a visual line like all the other sensors

aaron_sK · Posted: Sat Oct 20, 2012 8:57 am Post subject:

You ground the ALDL to force the IAC to close and then you unplug it so you can set the blades.

That is the sort of quick and dirty way to get minimum air set for TGO yahoos who can't datalog and would sooner do a carb swap. Wink

If you leave everything hooked up you can set it while watching the IAC counts on your computer.

BluFbdy · Posted: Sat Oct 20, 2012 9:27 am Post subject:

Ok i grounded the aldl last night, ran the iac closed unplugged it, turned the key off, removed the jumper, plugged in my laptop, turned the key on and watched it as I set it I think what you're describing is exactly what I did lol

Twilightoptics · Posted: Sat Oct 20, 2012 9:47 am Post subject:

With the USC unplugged, there is nothing to watch. You're just getting the idle down while the iac is closed and disabled.

aaron_sK · Posted: Sat Oct 20, 2012 10:06 am Post subject:

You can unplug it and adjust the minimum idle down or you can leave it plugged in and adjust the idle until you hit the proper IAC counts. You cannot do both at the same time.

If you don't mind the drive feel free to bring it out here. I will be around all day. Cool

BluFbdy · Posted: Sat Oct 20, 2012 4:53 pm Post subject:

You can adjust the iac without grounding the aldl? I never knew that

BluFbdy · Posted: Sat Oct 20, 2012 5:09 pm Post subject:

So just to be clear, start the car and just turn the idle screw until the proper steps are obtained? What step count should I be at during idle?

Twilightoptics · Posted: Sat Oct 20, 2012 9:02 pm Post subject:

Basically yeah. You'd have to do some digging to find what typical stock idle iac counts are.

When you're tuning a modded motor, you shoot for about 20 counts. What that does is make the idle air go mostly through the throttle blades, which makes the computer (compensate) less and you get a more stable idle with larger-lopey cams.

All minimum air is, is setting the air that runs through the throttle body. So your 450rpm is through the throttle body, plug the IAC in and that extra idle bump is all from the IAC.

You could even try opening the throttle blades and see if the iac tries to close any, or just close the blades altogether to see if the iac opens more.

BluFbdy · Posted: Sat Oct 20, 2012 9:13 pm Post subject:

When I open the throttle blades it steps out like it should, I just can't get it closed all the way because the exhaust pissed off my neighbors lol I had no idea about this, doing some digging on a warm stock ish motor I need to be 10-15 ish so ill do that tomorrow. I feel slightly retarded now because I've done all the work to this in the last5 years and never heard of this lol all my problems have been because of some quirk I've been totally oblivious to