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Ouch. I'm pretty sure mkreibs used to work there and do the tuning.

I'm pretty sure the OEM oil pressure 'sensor' is just a switch, if that's what you're talking about.

Write entire = no problems

I did a 30 minute log. The car drove a bit funky when it switched to closed loop (a little surging under light throttle) it smoothed out after a few minutes, but the MAF...

hmmm. I checked a couple '08 and a couple '09 files and they all ended in 14. My GMS1 ended in 10.

Either way, the write entire seems to have worked. I'll update tomorrow afternoon once I have...

I'm looking at the license info screen in HPT and it shows my car as an '09 for some reason. I might try a file from an '09. Or see if I can find a file with the same OS ID. I feel like I'm going to...

Yes, both '08 Cobalts. The file came from the tune repository, but the info in HPT says it's an '08 Cobalt.

I actually just tried flashing to a stock file (from a different car). Mine has a GMS1 base file. I didn't have HPT until after I had GMS1 flashed by a dealer.

This is what popped up.
...

That's a possibility. I did clean it before the log, however, and I let it sit in front of a fan for about an hour. There was an oil film on it (I have a relocated MAF, by the way). I was getting...

That was my first log after switching to V2.24. The actual pressure PID was not working.

I added the log to the first post.

Or something else?

39032

Everything seems ok, then the MAF suddenly reads 45lbs/min and the fueling goes rich. The frequency hardly changes at all though. I let off as soon as possible.

Your actual afr will respond more precisely the closer you get your fuel trims to zero.

I know the screen shot you're talking about. I'm not sure what scaling was being used, but I have never seen...

Here is the log and tune from the screenshot.

I'm not sure what's going on there. The actual and commanded lambda aren't close anywhere in that screenshot. Mine just goes rich for a short time.

I'm still having issues with this. One thing I have noticed is that after getting back on the throttle after shifting during light acceleration, it sounds like the bypass valve is 'leaking' or...

I'm not sure what your scaling is for actual and commanded lambda, but you might want to change it to something like 1.25max .75min. It will show any variations a lot better.

It looks like it's...

If anyone could post a log that has a 2-3 or 3-4 shift similar to what I have in the screenshot in the OP, I would appreciate it.

Yeah, there are most likely things going on that I don't understand. It's too bad though because I was never able to get my tune anywhere close to this with the MAF in the stock location and the K&N....

The LTFT is a bit positive, but the STFT is pretty close in the WOT sections. I'm not aware of the ECM using fuel trims in PE to adjust fueling. It should just be done in the PE table to adjust...

They look pretty good to me. Or am I missing something? The spike is happening before the trims can react.



Stock BPV. I was checking things out on my car and realized that I don't have the...

I think I'm getting my car dialed in, but one of the things that eludes me is the rich spike. It's fine at the initial WOT, but right after a shift it spikes hard.

I'm running E47, MAF relocate,...

The stock MAP sensors will only display up to 255kpa. Since it's flat lining in the scanner, it's actually going above what the sensor can read. That's why you want to work your way up to that limit....

It looks like it happens during normal driving, possibly idling too.

Anyway, very similar to the OP's log. I am currently running the stock intake and stock tune. The O2 sensor has been on the car...

I was talking about the mixture test.

The KR is pretty similar to what I've always seen with my car though.

Pardon my ignorance. I hadn't noticed that before. I looked through your log a couple times before I saw it.

Does it only happen under certain conditions?

How are you doing that?

I'm just curious how you can control the commanded lambda like that, unless that's not what I'm seeing.