HELP! - Scan Results for L36 w/ cam, high compression - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-29-2005, 02:59 PM   #1
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Default HELP! - Scan Results for L36 w/ cam, high compression

Ok gentlemen..... I need your best diagnostic work here. This is scan data we took while cruising on the highway last night. We have no KR at WOT, but we're getting KR under low RPM with light acceleration with the TC locked. We will post data from some WOT runs later. Let me know which parameters are necessary, and which other ones would be helpful. Thanks!




P.*. I have no idea why the scanner lists two different Short Term Fuel Trim numbers, so I included both. I also don't know the difference between the "Oxygen Sensor 1 Bank 1" Parameter and the "Front O2 Sensor" parameter. If you can shed some light on this, please do!
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Old 11-29-2005, 07:36 PM   #2
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I was told on IAClubGP that my cruising scan reveals a lean condition... something I'll have to get tuned out in the new PCM. Here'* the good stuff: a WOT run we just completed. Let me know what you guys think.




As you can see, I get no KR under WOT conditions... only under part throttle with TC lockup. Not too sure what'* happening, but I'm going to get a more experienced 3800 owner to scan me on Saturday (hopefully). Still, give me your opinions on what is happening with the car. Thanks.
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Old 11-29-2005, 07:37 PM   #3
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In addition, I can send the Excel file to anybody who wants to see the data in better resolution.
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Old 11-29-2005, 07:41 PM   #4
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i was just getting ready to say that.
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Old 11-29-2005, 08:01 PM   #5
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You don't have the rpm to go along with those values do you?
Edit- crap I see it now.
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Old 11-29-2005, 08:09 PM   #6
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the O2 sensor thing is confusing me. one says ur going from lean to rich like ur supposed to but the other says ur constantly rich.
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Old 11-29-2005, 08:15 PM   #7
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I'm almost convinced that those timing values are positive. As rpms rise during wot, the timing will go up and if those values were actually negative they would be getting closer to zero as the rpms increase.
As far as the KR goes, Looking at your LTFT'* you are running lean so if you richen it up a bit, it should be good.
Get another scaner on there. Negative twenty somthing timing with zero KR? And Two STFT'*??
I had tons of KR in the past from oil getting into the cylinders and the closest I ever got to negative timing was +7*.
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Old 11-29-2005, 08:53 PM   #8
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Doug mentioned in that other thread that my timing has actually gotten up into the positive numbers briefly.... we saw +0.5 a couple nights ago, so we're pretty confused about what is normal and what this thing is doing . I think I'll get a good scan on Saturday, because I'm totally in the dark with this motor right now. I hope some other guys look at this stuff, like willwren, DrJay, Foghorn, PDad or Silverbullet.......


We'll see what happens. It'* pulling pretty dang hard when it gets over 4K, but I think it can go faster.
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Old 11-29-2005, 08:56 PM   #9
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Been peeking, but I'm still stuck at work. Hoping to dissect later tonight.
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Old 11-29-2005, 11:14 PM   #10
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Quote:
Originally Posted by willwren
Been peeking, but I'm still stuck at work. Hoping to dissect later tonight.
That would be great, Bill. Thanks for taking an interest.

I think you guys will be interested to read the diagnosis I'm getting on the Iowa Club Grand Prix site. It'* looking like I might need a custom tune done in person. Here'* the link.

http://www.iaclubgp.com/forum/viewtopic.php?t=1812

Thanks again to everyone who is checking this out.

EDIT: Even with my goofy fuel mapping, the car is starting to pull nicely in the upper revs

Here are the cam numbers, if they'll be of any use in the diagnosis. Heads had .040" taken off.

Lobe Center Sep 110.8*
Valve Overlap -11.9*

Intake
Valve Open -5.9*
Lobe Center 110.1*
[email protected]" 210.2
Max Cam Lift .30622"

Exhaust
Valve Open 36*
Lobe Center 111.5*
Valve Close -5.9*
[email protected]" 210.1*
Max Cam Lift .30642"
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