93 running rich?
Thread Starter
Racer
Joined: Jul 2011
Posts: 387
Likes: 2
From: Austin TX
93 running rich?
I just got around to datalogging my new 93 vette its completely stock except a KnN filter, I am using the 1320 aldl cable and the aldl droid app, both are great! After getting my first feel of the car I found a bad O2 sensor and replaced it. How ever the car still seems to be running a bit rich and I dont really know where to start.
BPWs moving from 8 to 9 and sometimes even 10
Any suggestions?
BPWs moving from 8 to 9 and sometimes even 10
Any suggestions?
Last edited by Jay7199; May 17, 2014 at 01:45 AM.
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Advanced
Joined: Feb 2014
Posts: 88
Likes: 7
BLMs range between 108-160, 128 ideal as stated by MrWillys. Just from the screen shot, I don't think you are too bad. I've always had a left to right delta too; I figured it was the fuel rail design; there is a pressure drop from one side to the other. One day I will go to true parallel rails. BPW is the injector pulse width. I'm a little surprised there are red limits programmed into the ADX file for that. Hopefully someone smarter than me set them! As far as the .csv file is concerned, that stands for 'comma separated values'. You can upload that and folks can look at it with any spreadsheet program. You can probably even open it up on your android phone, I just don't think you can graph on your phone; again, someone smarter than me can probably do it.
You definitely don't want your BLMs close to the limits, then the ECM can't regulate the fuel mixture. LT1s occasionally suffer from BLM split, where one side goes to 108 and the other goes to 160. Big cams, headers, and exhaust leaks tend to cause the BLM split. Just something to watch out for!
You definitely don't want your BLMs close to the limits, then the ECM can't regulate the fuel mixture. LT1s occasionally suffer from BLM split, where one side goes to 108 and the other goes to 160. Big cams, headers, and exhaust leaks tend to cause the BLM split. Just something to watch out for!
Thread Starter
Racer
Joined: Jul 2011
Posts: 387
Likes: 2
From: Austin TX
Well i just replaced the passenger O2 because it was bad, Heres the datalog i took with my phone.
https://www.dropbox.com/s/q1w7yem8sl...7_17.30.44.csv
https://www.dropbox.com/s/q1w7yem8sl...7_17.30.44.csv
Burning Brakes
Joined: Mar 2005
Posts: 1,082
Likes: 115
From: Richmond Hill Ontario
You need to make some VE adjustments for BLM cells 3, 10 and 15 here is why:
In BLM Cell 3 the LBLM=122 and RBLM=150 which means your right side is lean.
In BLM Cell 10 the LBLM=140 and RBLM=148 which means both sides are lean.
In BLM Cell 15 the LBLM=135 and RBLM=160 which is very concerning as this is WOT and is indicating that your right side is very lean.
I'm starting to wonder if perhaps you have an exhaust leak on the right side??
There is no knock retard which is a good sign. However , I'm not sure what this means but it shows Injector Driver 1 and Injector Driver 2 Errors.Could this mean that your ECM is intermittent??
In BLM Cell 3 the LBLM=122 and RBLM=150 which means your right side is lean.
In BLM Cell 10 the LBLM=140 and RBLM=148 which means both sides are lean.
In BLM Cell 15 the LBLM=135 and RBLM=160 which is very concerning as this is WOT and is indicating that your right side is very lean.
I'm starting to wonder if perhaps you have an exhaust leak on the right side??
There is no knock retard which is a good sign. However , I'm not sure what this means but it shows Injector Driver 1 and Injector Driver 2 Errors.Could this mean that your ECM is intermittent??
Last edited by FrankieD; May 22, 2014 at 01:39 AM.
Thread Starter
Racer
Joined: Jul 2011
Posts: 387
Likes: 2
From: Austin TX
Perhaps I do have a exhaust leak, I havn't had the car for very long so im still getting a feel for everything. I did a EGR/AIR delete on it, Maybe one of the block of bolts is leaking through the threads? Ill give her a look over tomorrow. Thank you for reviewing the data! Happy to have a lead on it now.
Thread Starter
Racer
Joined: Jul 2011
Posts: 387
Likes: 2
From: Austin TX
ok guys, I found and fixed the exhaust leak but its still running rich, Theres two other symptoms that are in this datalog.
First, it has a weak spot at part throttle when i shift from first to second.. It just kinda bogs.
Second, Near the end of the log I took a turn and tried to get her sideways.. Well I started to slide out and then suddenly all power was killed to the engine and we nosed over.. then it picked back up just fine, what the hell is that? ABS TCS problems? or is it trying to save me from a "slide"
https://www.dropbox.com/s/ocbq7zsqjo...3_19.30.16.csv
First, it has a weak spot at part throttle when i shift from first to second.. It just kinda bogs.
Second, Near the end of the log I took a turn and tried to get her sideways.. Well I started to slide out and then suddenly all power was killed to the engine and we nosed over.. then it picked back up just fine, what the hell is that? ABS TCS problems? or is it trying to save me from a "slide"
https://www.dropbox.com/s/ocbq7zsqjo...3_19.30.16.csv
Last edited by Jay7199; May 24, 2014 at 12:12 AM.
Burning Brakes
Joined: Mar 2005
Posts: 1,082
Likes: 115
From: Richmond Hill Ontario
[QUOTE=Jay7199;1586972218 Near the end of the log I took a turn and tried to get her sideways.. Well I started to slide out and then suddenly all power was killed to the engine and we nosed over.. then it picked back up just fine, what the hell is that? ABS TCS problems? or is it trying to save me from a "slide"[/QUOTE]
How much fuel was in your tank. It could have been caused by low fuel slosh. Do you have a newer datalog after the exhaust leak fix?
Curious as to where you found the exhaust leaks.
How much fuel was in your tank. It could have been caused by low fuel slosh. Do you have a newer datalog after the exhaust leak fix?
Curious as to where you found the exhaust leaks.
Last edited by FrankieD; May 24, 2014 at 12:15 AM.
Thread Starter
Racer
Joined: Jul 2011
Posts: 387
Likes: 2
From: Austin TX
Burning Brakes
Joined: Mar 2005
Posts: 1,082
Likes: 115
From: Richmond Hill Ontario
Here is what I notice. Your BLM's are way better now.
However , there are numerous times when you totally lost spark advance(it was only 3 degrees) and at the same time all your injectors were shut off. I think you may have an intermittent ECM failure as I don't think ASR functions this way..it will remove spark advance but not shut off the injectors completely. Or could a faulty Optispark cause these symptoms
However , there are numerous times when you totally lost spark advance(it was only 3 degrees) and at the same time all your injectors were shut off. I think you may have an intermittent ECM failure as I don't think ASR functions this way..it will remove spark advance but not shut off the injectors completely. Or could a faulty Optispark cause these symptoms