another tuning question

[steve40]

I recently got my car up and running after redoing a lot on the motor and restoring the car. I went thru AutoVE and AutoMAF so far. Tonight I put everything together into one tune and let the car go back into closed loop.

I noticed starting at these frames 2490, 3130, 4320, the car gets pretty rich. I didn't notice anything like that thru the two tuning methods above, and kinda lost on where to look, or what may cause this change once in closed loop versus open loop.

Same thing happens again starting at frame 4900, this time the pcm shows it's commanding a richer mixture. Would this be the PE modifiers coming into play?

There are more spots throughout the log. I thought this covered what I wasn't sure about.

[joecar]

Is your FPR (fuel pressure regulator) manifold-referenced or un-referenced...?

[steve40]

Is your FPR (fuel pressure regulator) manifold-referenced or un-referenced...?
Its hooked up to the manifold

[statesman]

You seem to be dropping out of closed loop and going into open loop commanded fueling. My first guess would be cat converter protection. Do another log and add GM.CATTEMP to the list of things you log.

[steve40]

is there a few other pids you need for gm.cattemp? it's greyed out with a "x". same thing when i try more info, i can't select it.

[joecar]

That pid does not depend on other pids (like the calc pids do)...

Try doing Info->Validate Pids and see if the red X goes away.

[Jetmech442]

Just took a quick look. Starting raound frame 4280, after the climb to 70mph, it looks like you let off the pedal, it goes to zero(which is wierd to me, Imine never goes below 7 or something %). As you coast down, MAP varies quite a bit. it goes to 25% which seems fine, but then is randomly ~60. then when you start to incresae speed again, its at 97kPA at only 47% throttle.

Just thought I'd point that out as it seems unusual to me.

Would oyu mind a brief description of the engine specs(cam, intake..etc)

[joecar]

Interesting observations Jetmech...

now you got me looking much closer...

:)

[steve40]

Sure

Its a 370, ported ls3 intake and heads, 90mm throttle body. Cam is custom 227 / 238 .613 / .581 114 lsa. Drivetrain is a 4l80e, stock truck converter and a 3.50 gear n

A local tuner showed me some issues in the maf table and in a few drives we cleaned it up. I'd have to do another log and compare it to what you saw in the posted log

[joecar]

I forgot to mention that your log shows DTC's P0106 (MAP sensor) and P0507 (IAC high idle)...

your MAP sensor isn't ranging properly...
and your IACV is not able to bring idle down...
check for air leaks.

[joecar]

Which wideband are you running...?

[joecar]

It seems to me that your MAF is lagging by about 1 second... post a pic of the MAF duct/plumbing.

[joecar]

It seems to be getting richer because either of COTP (cat over temp protection mode) is enabling...

( PPM has the same commanded fueling but is not enabling since it's MAF/TPS/ECT enablers are not reached )

[Jetmech442]

Yeah,backing up what Joe said above(I hope!) at frame 140 your idling at 1000 rpm with 0% throttle and ~27 degrees timing. At your ECT(194F) your B4603 is commanding 800 rpm. Then at frame 160 idle drops to ~700, timing spikes to ~40 degrees (I imagine from Stall Saver) . For quite a while after that RPM raises all over the place, all without any pedal.

[Jetmech442]

after another glance without playing ten thousand questions in my ear(kids), I see your Stall saver is zeroed out. And even though theres no pedal signal, the vehicle is moving. so either your rolling down a hill in gear, or your pedal isn't properly registering.

Other things I see as weird: B0108 and 7 are zero'd. I would think these need a proper value in order to use the idle airflow tables. I'm not sure but I think you may be idling based purely on the VE table.

-Oh, and I'm not a professional tuner, yadada....

some of the things I see may just be attributed to the 90mm TB and ported intake.

[joecar]

Do you have the stock tune that this PCM started with...?

[steve40]

hopefully this answers all the questions.

i do have to get out and do another log for driving, just out for the weekend and trying to install cats next weekend. after my friend helped with the maf scaling, things are better, and i've worked on the idle to get it down lower. i think that was the cause of the high map values.

log 38 was the last time out driving with the new maf table
log 41 is the idle where i'm at right now

[steve40]

i have a aem uego wideband