AFR Changes and Open Loop Multiplier Table
07-05-2005, 02:32 PM
#42
yeah i am, all you have to do, well i took my maf out, i turned the codes to not show the light but throw a code, and that was about it really that i can remember that i had to do. then there are some other little tables. i can send you my bin file before my cam and you can take a look at it if you want to
07-05-2005, 02:48 PM
#44
Oh, and here's a question about getting there from here:
When I did my first SD tuning session (open loop to get the VE table in line), I just set my MAF fail freq to 0. I started the car up, and started driving along, and never got an SES light. I did some other tweaks, but never got an SES light. I did verify that I got a P101 code (the only one I had)...so how would the car act if it didn't fall in to SD mode? I don't want to unplug my MAF...I guess I'm just wondering if I'm even in the right mode. I am getting a 12.96 commanded AFR at all times, and my VE table isn't too terribly far off when I do the AFR % Error Histogram...I'm just assuming that it was working as it should.
When I did my first SD tuning session (open loop to get the VE table in line), I just set my MAF fail freq to 0. I started the car up, and started driving along, and never got an SES light. I did some other tweaks, but never got an SES light. I did verify that I got a P101 code (the only one I had)...so how would the car act if it didn't fall in to SD mode? I don't want to unplug my MAF...I guess I'm just wondering if I'm even in the right mode. I am getting a 12.96 commanded AFR at all times, and my VE table isn't too terribly far off when I do the AFR % Error Histogram...I'm just assuming that it was working as it should.
07-05-2005, 04:42 PM
#52
Originally Posted by WS6FirebirdTA00
chad, does you commanded afr equal your actual afr and just isnt lining up with what you have in the computer for it to be set to?
07-07-2005, 03:16 PM
#54
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I had noticed a problem last week that may be affecting your car as well. I followed everyone's suggestions for tuning by setting MAF Fail Freq to zero. I went through with my tune and checked everything using my LC-1 and it was gravy. Then, I tried to go back to stock settings with my new dialed-in VE / PE tables thinking the open loop scenario will command the richest AFR (ie - if OLFA says 1.13 and PE says 1.17, it will command the 1.17 EQ). My trims took a nose dive on me and I spent some time recalibrating the MAF, but it just didn't seem right. So, the second time around I completely unplugged the MAF and the wideband tuning caused my whole VE table shift upwards. I haven't gone back to closed loop operation just yet, but I can't help but think the PCM uses the information reported from the MAF even though the fail freq. is set to zero.
07-07-2005, 03:27 PM
#55
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One correction in your statement. The pcm uses the richest values in PE mode between the two tables all other times it uses the OLFA table.
Unplug the maf sometimes it takes a while for it to fall over into SD mode. I would only plug it back up when i was getting ready to recal it.
Unplug the maf sometimes it takes a while for it to fall over into SD mode. I would only plug it back up when i was getting ready to recal it.
