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Well, that's it. Giving the car back to the customer this afternoon.

The issue/bug with the Idle Air Follower locking the ECU out of going into idle mode was... interesting. But with that solved...

I have made a major discovery.

The Idle Air Follower (IAF) proportionally matches the Throttle Position Sensor (TPS) as long as the TPS is greater than 0%.

In the specific circumstance where...

@kevin87turbot, that's one of the first things I tried with the car and it both made the stalling worse and, when the RPM was high enough, it wouldn't drop back down. The minimum air screw is...

Another note for future readers:

In the Engine, Idle, Airflow settings, under Adaptive Idle Airflow is the short term idle trim and long term idle trim. These have maximum learned values and on...

Good observation and shows why I need to add more values to the charts.

The parameter "Desired IAC Area Max" actually seems to be the minimum, not the maximum. The IAC never goes below that value....

@reubone, I'll give that a shot a bit later (after a try some other settings and the car's warmed up). That's an excellent strategy. I need to hang out on the forums more often so I can learn shit...

I think the approach for that would be proper VE tables but this engine is so far from stock I'm not even confident a stock LQ9 VE table would be better than the Corvette VE table (I assume) in this...

I'll give the stall saver a shot. I hadn't actually tried it yet because my intuition figured it would just raise target RPM, but at this point it's worth a shot.

And yeah, when I got the car and...

Solid advice. I already made that suggestion to the guy and his outlook on it is "it just needs to be good enough, do what you can."

I knew it would be a mess to begin with... but I am charging...

TL;DR: The only airflow/fueling sensor this car has is MAP. No IAT. No MAF. No O2s. It won't idle properly (go figure). It's a straight piped 6.0 LQ9 with very low restriction intake and a cable...

I don't understand. On one of my computers, I can edit files just fine. On the other, it's telling me I have to license the vehicle the tune came from in order to save the file.

Not flash it to...

Just to double check, you can read the ECU binaries right?

I had a customer with an A4 and HPT reported they had specific ECU but their ECU (stock) wasn't actually supported. I couldn't read the...

I can help out if you like, although I'm most easily reachable on Discord. My Discord tag is in my signature.

I thought HPT would already have everything mapped out, but it makes a bit more sense now.

The general and system menus should be populated a lot more. There should be modern vehicles that are...

If you have Discord, add me. My info is in my signature at the bottom of this comment.

I'd be willing to help you there as it's an instant messaging service. If you don't want my help though,...

Is the new voltage too high or low?

For example, if the vehicle expects a FLA battery but you installed an AGM, it may think the voltage is too high.

Otherwise, I'm curious why it would have an...

It's hard to understand exactly what you mean because of the broken English.

You may need to go through the flashing process again. Make sure the vehicle's battery is charged and/or put a battery...

I've been reading the googles and reading the forums. It seems like SIMOS 18.1, 18.6, and 18.10 are supported, yet 18.2/5 are not due to some technical limitations.

However, I found a github...

Have you guys had any luck with the 'vag 06l 907 425' ECUs?

2017 Audi A4, SIMOS 18.4.

Apparently HPT can't read it. Looking for a solution or alternative software.

Are US models always SIMOS instead of MED?

I'm having that issue on a 2017 Audi A4. HPT says it should be a MED17.1.1 ECU. I ripped it out and it's a SIMOS 18.4. Somehow, HPT doesn't support SIMOS...

I need to tune SIMOS 18.4 for a 2017 Audi A4. Surprised it isn't already supported... what company did you end up going with?

Did you guys figure anything out for the SIMOS 18.4?

It seems like VCM Editor has a config for 18.1 through 18.6, yet it doesn't work.

2017 Audi A4, 2.0L 4cyl, hit "Read Vehicle":

"Unknown controllers detected. Specify or read again."

I specify the exact model (MED17.1.1):

"Failed To Retrieve Flash Data"

I specify a...

What the hell did I just read?

To be safe, hook up a 20A battery maintainer while doing ECU stuff.