actually looking back at your log, the MAF is reading. i wonder if this has to do with a MAF test threshold for the sensor since it's a b-body sensor?
so next thing i'd try is turn the following two flags off and flash again:
MAF system diagnostic (error 48)
knock sensor diagnostic (error 43)
lets see if it'll kick back into maf mode, and do a log to see how it runs.
you know what else? your knock sensor seems to be working too.
maybe you should run scan9495 or something so you have a more reliable source of codes.... i don't trust these.
OK, got it. I did some trouble shooting today and ordered a new knock sensor. As for the MAF, I have batt. power on the pink wire and since the harness is new I assume that it's grounded. I found some good articles on checking the MAF so that is what I'll do later today. I have to say that after running it today, and reading the sparks plugs, it appears to be NOT running as rich???? Not sure why, but here is another scan, perhaps is will say something different.
Thanks
***UPDATE***
I posted the above before I saw your latest posts. So I will go back and make the changes to the flags and let you know. BTW I AM using Scan9495 to do my scans.
Last edited by terpngator; 10-04-2014 at 11:15 PM.
OK, turned the two flags off and reflashed. Ran Scan9495, here is the scan.
Thanks Steve.
try this and log again, might be more in the ballpark. i scaled your low end maf tables a bit. these idle logs are kinda a bit useless too without some driving, but at least we can get your idle AFR a bit better.
no doubt your plugs are fouled less, its not defaulting to speed density. if it's using the maf it'll be a lot more accurage.
oh you have to move the throttle a bit for these logs too otherwise we'll never get anywhere...
Move the throttle? You want me to rev it while logging? Take it up and hold it, or just goose it?
well, ideally, drive the car while logging. but if the car isn't driveable yet, just take it up to about 2500 and hold it there for 20 seconds just so we have an idea of how close the maf table is there. after that, you need to get this thing on the road before you run it more and do more tuning.
OK, I flashed the latest bin and here is that log. I'll do another with the engine at 2500 rpm. After that it may be a while before I'm finally on the road, but that may change depending on how long the painter has the body.
Here is the log with the engine running around 2500 RPM. Can you tell me, what in this log your looking at, that will be different from the previous logs. Might help me to better understand. Also, specifically, what did you change in the bin?
You try to relate blm trims +/- 128 to maf afgs in the log to tune the maf curve and get your afr closer, so closed loop can do its job..
in the last bin I pulled 15% fuel from the low end of the maf table, as it was at least 15% rich in that range (assuming o2 sensors are reading properly). it may need more fuel pulled since trims were maxed out
Last edited by steveo; 10-05-2014 at 09:48 PM.
note in your last log, once closed loop has worked for a while, blm trims are at 108 while idle afgs is ~20. that means it was reading too much air. now compare the maf table from the new and old bin. maf tables are tricky though, the curve has to be just right... and a small change is a big amount of fuel . I made a big change to try to push it into a range where measurements from closed loop will be useable. itll never be that accurate because of your cam so usually you just want to get it around 14.2:1 or so then let closed loop do its thing..
ok, we got your trims to go up one one side, but what you have now is a really nasty blm split.
it's possible you have one bank running way stronger than the other for some reason.
one bank is maxed at 108, the other bank is 120-137.
that's not good;
is it possible you plugged your o2s into the wrong banks? left one where the right one should go?
Thanks Steve. I don't think the 02s are reversed. The way the harness is made, with the runs going down each side of the intake, the plugs for the 02s will only reach thier respective side. I'll check it further when go to the shop today. Any other why one side would be running richer than the other? I'll run it today and read plugs on each side.
****UPDATE EDIT****
OK---I just re-read a thread in another forum and realized that I'm using a knock sensor from my original 1997 doner. I've ordered a new one for 95LT.
Last edited by terpngator; 10-06-2014 at 02:12 PM.
Steve, I hope you don't mind, too much, a few points of clarification for me.
At what point in my log, row & column, tells you that the program enters closed loop?Originally Posted by steveo
I spent a hour going over my log, to trying to associate these numbers with a point in the log and couldn't find them anyplace. So, is this a deduction you've reached based on values in ??what cells, or something else?
OK, I'm looking at the BIN Parameter Tree by Parameter Category. In what folder am I going to find that MAF table? I see, in "*AIR FUEL METERING" MAF Calibration, for specific Hz. Is that where I make changes or is there an MAF table that I don't see?
hahaha, again, I've scoured my log for that "108" and "120-137" number and could not find them anyplace that had anything to do with fueling. Im sure it's because I, still, have no clue of how this log interprets results. So, where in my log, ROW/COLUMN, is that represented?
Trust me Steve, if there was a class someplace that offered this, I would be there in a HEARTBEAT!! Sorry for so many ???
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