I just got my MS3Pro installed. I'm using a 14point7 Spart 3 Lite V2 Wide band. I've also swapped to an NB Throttle Body. The car will crank and I can get it to run with a little throttle, but it wants to idle real low and dies. I noticed that the AFR is staying at 10.3 without any change, so I think it's the Wideband. There isn't a gauge with this controller, but the indicator light indicates that it's warming up and comes up to temp quickly. I wired the Wide-band into the factory O2 harness. Is there anything else in the configuration that needs to be changed?

I've recalibrated the TPS and updated the IACV settings to the NB settings. I verified the base timing at 10 degrees advanced before swapping the ECU. Am I missing something?

 

This is how I have the Spartan wired up.

 

Okay, so I think I've confirmed my Wideband wiring. I missed updating the AFR/EGO port to O2 in. Now the AFR seems to read correctly. It seems to run a bit better. However, it still idles very low and wants to die. I noticed that some of the "Idle Control" settings are greyed out for me. Not sure if that's the problem. I'm assuming they're greyed out due them not being used in my current configuration.

Anyone running an NB TB on a NA 1.8? Can you confirm your Idle Control settings?

 

Post your tune a log of it starting.

Loads of people run NB motors, and NB throttle bodies on NAs, it won't be difficult to tune. However we're only guessing what your issue could be without the tune a datalog. Most settings are probably greyed out because you're on open loop, again just guessing.

 

Thanks. Very much a noob here. See attached log.

 

And your tune?

 

Here's the tune. I discovered that one of the pins for the IACV hadn't locked in, and pulled partially out. The car now will run without giving it gas, but it still stumbles around idle. It will nearly die, and then catch itself.

 

Also, thanks so much for taking the time to look. I've still got lots to learn.

 

Try this. I didn't make any major changes since you fixed an issue with the idle valve and I don't have an updated log of how it runs now.

Here's the steps when asking for tune help:

1. describe issue
2. attach a log of the issue happening
3. attach the tune used during step 2's log
4. post

Once someone's helped:

1. load their tune
2. log the issue again
3. attach the log
4. post

repeat as necessary.

It's important to try and not make changes yourself in between these steps, as that will throw off whoever's helping you.

 

Curly,
Understand and thanks a lot!

I ran your tune. Idle is still rough. It bounces up to about 2000rpm and falls down to about 600rpm, but it doesn't die. I can see the MS triggering IACV.

See attached log with your latest tune. Nothing else has been changed.

 

Try this. It's all over the place so it's really hard to determine if it's fueling or idle valve making it go crazy. I've switched to open loop idle which will hopefully even it out so we can get an idea of what it's doing.

 

Running a little different. It falls off more slowly in open-loop, but sometimes it'll catch around 600rpm and bounce back up, and other's it will just die. I did notice that the base tune for the 99+ has the "Run Valve before Start" set to on and your tune did not. I have not tried changing that yet.

Here's the updated log.

 

I just noticed something. I can hear the IACV when it's activated. It's humming. I have a custom aluminum intake tube that is helping make it more audible. I bought this TB off ebay. I'm wondering if it's stuck or defective.

 

Right, the MS can calculate a setting for the idle valve even at 0rpm, but if you have "run before start" on, you'll hear it buzz. Good for idle valves that might take a little longer to get into position, but you don't have that problem, so you can keep it off and not hear the buzz.

You can try the attached, slightly different idle values, but when your RPM is oscillating a lot, so is your MAP. I'd expect a little but 85kpa seems like a lot. Wideband isn't working either, are you sure it's calibrated properly?

 

With regards to the wideband, all I've done is select the "o2 in" for the port in the AFR/EGO control and select the "14point7" for the EGO sensor under "Calibrate AFR Table". Is there anything else I need to do?

 

For MAP, I tapped into an unused vacuum port right behind the TB. I didn't use the supplied "T".

 

That should be all you do, yes. I'd stick a multimeter in 2N and verify you're seeing ~4.5v with the engine off (full lean), and ~2.5v when TS says ~14.8. Right now it's jumping between 14.8, 16.7, and 13.3. You sure you're not connected to the simulated narrowband, brown wire?

 

I just verified the wiring. I'm definitely using the green "wide-band" wire and my wiring matches the image I shared earlier. I'm assuming you mean 4N, as that's the factory O2 wire? I'll try and put a multimeter on it as soon as I get a chance.

 

One other thing I just noticed is that I did not change the "Idle RPM Timing Correction Curve" settings. Should these be based off the engine or TB/IACV?

 

When asking what changes were necessary to swap an nb throttlebody into na it sort of implied the car has been tuned already and is running fine.

Now you say it wasn't even running a wideband before?
I'm confused.