Scanning - *UPDATED* - KR issues - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 12-07-2004, 11:50 PM   #1
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Default Scanning - *UPDATED* - KR issues

When I go home, I'm going to hook up a Tech II to my car and take some readings. I want to see if I am running too rich/lean, and make sure everything is doing well inside my engine.

What kind of stuff do I want to scan for, and what are the proper readings for each?

I know to check the O2 levels, but what else?

I'm not very familiar with what is normal for the S2 engines, and not familiar with tuning at all. Any advice would be great.
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Old 12-08-2004, 01:46 AM   #2
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Make sure you got all your KR readings, timing, ummm there are tons..
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Old 12-08-2004, 01:54 AM   #3
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Knock retard, Spark advance, Long term fuel trims, Short term fuel trims, Long term fuel trim cell.... 02 mV..
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Old 12-08-2004, 10:09 AM   #4
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What would be the proper readings for this stuff?
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Old 12-09-2004, 08:55 AM   #5
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KR should be 0 of course,

Long term and Short term fuel trims should be as close to 0 as possible.

Timing should be 15-17 at WOT unless you have an aftermarket PCM in which case it should be a little higher.

02'* should be somewhere begtween 915 and 925 depending on mods.
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Old 12-09-2004, 04:07 PM   #6
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Thanks. I'll be checking this stuff soon.
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Old 12-09-2004, 06:25 PM   #7
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Anyone know the normal spark advance for a L36 at WOT?
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Old 12-18-2004, 12:20 PM   #8
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I'm going for a test drive soon to scan, I'll post the results sometime today.
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Old 12-18-2004, 02:37 PM   #9
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Well, I don't have a log on file, but we had the scanner running while I was driving.

My LTFT'* and STFT'* are very close to 0, maybe only going just above and below 0. The O2 readings are fine. We weren't able to check the timing, cause this scanner is relatively new, and we don't know much about it. (Brand new Tech II scanner, top of the line, with a million features)

KR on the other hand, needs work. I'm getting about 4 or 5 degrees of KR at WOT. It spikes up a couple at the shifts. I do not know if this is false or not, because we do not hear any pinging or anything, and it drives very hard.

Maybe I need some PEM'* or something.

Any input will help.
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Old 12-18-2004, 02:46 PM   #10
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What plugs are you running? I had upwards of 5 KR on the 3.2 pulley so I backed off to the 3.3. I can still get a little KR with the 3.3 (already sold the 3.4...I'm stupid) but on 103 octane from the track it goes away and stays at 0.
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