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Tonyrodz
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Idling.
Tonyrodz's Tahoe Build Thread
- Thread starter Tonyrodz
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Tonyrodz
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Tonyrodz
Resident Resident
No??
Dantheman1540
Full Access Member
I didn't see anything crazy that said ***DANGER TO MANIFOLD***. Looked to be well within +-5% on the ST. I mean that would tell me it's not the greatest tuned thing in the whole world but I don't think 5% is that crazy. Typically when logging with a wideband I shoot for 3% when in open loop.
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Tonyrodz
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It sounds like it breaks up when I'm accelerating on the highway. Like a popping. Something definitely isn't right. I'm going to try to do the relearn tomorrow. I just put some 93 octane in it.
Dantheman1540
Full Access Member
Have you pulled any plugs yet? I know the back ones suck but pull a couple of the easy to get to plugs and see what they look like.
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Tonyrodz
Resident Resident
Ok. I haven't really put many miles on it. Probably 50 or less.
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Tonyrodz
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I found this--https://www.gmfullsize.com/threads/no-crank-relearn-performance-hindered.57484/
Says you can't have any codes stored. I constantly have a maf code stored, even tho the cel isn't on. It's a "soft code".
What's the procedure to do it with a Tech 2?
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Tonyrodz
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I wish I knew how to read Live Data.
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Tonyrodz
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Found this--https://www.performancetrucks.net/forums/tuning-diagnostics-electronics-wiring-161/crank-relearn-explained-sort-344161/
Turn the key to on position
Turn Tech II on
Select the Diagnostics Menu
Select Car Information (Year, Make, Engine, Etc.)
Select Special Functions.
Select Variable Crankcase Learn Procedure.
Follow On Screen Directions.
The Crankcase Learn Procedure is going to ask the Technician to do the following:
Put E-brake On.
Make sure car is in neutral or park.
Turn engine on.
Rev Car to Rev Limiter
Car is done.
Turn the key to on position
Turn Tech II on
Select the Diagnostics Menu
Select Car Information (Year, Make, Engine, Etc.)
Select Special Functions.
Select Variable Crankcase Learn Procedure.
Follow On Screen Directions.
The Crankcase Learn Procedure is going to ask the Technician to do the following:
Put E-brake On.
Make sure car is in neutral or park.
Turn engine on.
Rev Car to Rev Limiter
Car is done.
randeez
Full Access Member
It's not that simple.... lol
If you're using a maf this doesn't help much, but if your using the speed density
First, the ltft is the changes made according to the stft. I would prob advise against cleaing the ltft because you have no way of adjusting the fueling, whatever changes it has made is only helping.
You need to slowly and constantly accelerate and see what the stft are telling you. Negative numbers mean it has too much and its pulling fuel. Positive numbers mean its too lean and adding fuel.
The table is basically mapd out rpm x load(map). So for 2000rpm and 80kpa there's a fueling cell, 2200rpm and 75kpa there's a cell. And so on. In every direction in every map point.
When it hits on those cells it notes if the fuel its putting in is getting you to the correct afr. Thats what the stft is a percentage over or under
randeez
Full Access Member
When you're not steady on the throttle there's transients and what not that affect fueling, letting off etc
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Tonyrodz
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Mine has a maf.
And what exactly is the MAF DTC you have “constantly stored”? Are you positive you don’t have an issue with your MAF?
I am thinking it might be disabled in the tune?
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Tonyrodz
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It's a P0103. I've swapped it with a known good oem maf and it didn't get rid of the code. The plug is good also. It doesn't set the cel but it never goes away, even when I swapped to the other maf. I was told by someone it was the tuner's **** up. I was gonna have the maf tuned out, but I haven't done it yet.
