pick your brain regarding a tune

[Doubeleive]

i have a 92 tune from @BlackBearPerf and have had it for a while and everything is fine with it
However for the last 5-6 tankfulls I have been putting in e85 (instead of 92) and it has been running fine
yesterday I got a p0420 cat code on a cat that is only 5 months old and about 6k miles on it.
I am curious if the cat code could be related to me running e85 while on the 92oct tune?
all sensor data and fuel trims seem to be fine, no misfire's or anything, purrs like a cat.
any idea's?

 

[George B]

Flakey o2 sensor?

 

[Doubeleive]

Flakey o2 sensor?

maybe but I didn't notice anything just idling looking at the signal

 

[tooleyondeck]

this may sound overly simple but are your new cat(s) welded in? If not, have you checked for a leak near the bank 1 O2 connection?

 

[BlackBearPerf]

Running E85 shouldn't trigger a cat code so you should be fine in that regard. Do you have a cam by chance? If so, they can burn through cats fairly quickly even though 5 months is not that long. It could be a bad O2 sensor that is triggering that code. Is it an aftermarket cat? They can work just fine but not read efficiently.

 

[Doubeleive]

this may sound overly simple but are your new cat(s) welded in? If not, have you checked for a leak near the bank 1 O2 connection?

it is welded in and since it has been welded in I have been hearing a small leak at cold start up, but it goes away after about 20-30 seconds and doesn't return until it has sat and been cold for 8 hours. I am dropping it off at the shop that installed it this afternoon so they check it in the morning when it is cold, I have told them about the leak before but they can never find it because it only happens when it is cold and doesn't appear to be the manifold. It has been like that for 5 months and the code did not show up until after I started running e85, so I am just wondering if it has anything to do with the tune for 92 and running higher octane e85 instead

 

[Geotrash]

it is welded in and since it has been welded in I have been hearing a small leak at cold start up, but it goes away after about 20-30 seconds and doesn't return until it has sat and been cold for 8 hours. I am dropping it off at the shop that installed it this afternoon so they check it in the morning when it is cold, I have told them about the leak before but they can never find it because it only happens when it is cold and doesn't appear to be the manifold. It has been like that for 5 months and the code did not show up until after I started running e85, so I am just wondering if it has anything to do with the tune for 92 and running higher octane e85 instead

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[Doubeleive]

Running E85 shouldn't trigger a cat code so you should be fine in that regard. Do you have a cam by chance? If so, they can burn through cats fairly quickly even though 5 months is not that long. It could be a bad O2 sensor that is triggering that code. Is it an aftermarket cat? They can work just fine but not read efficiently.

it might be a sensor then I am going to try and do a log file and see if anything is out of whack, the cat is aftermarket, both are actually had them replaced once about 3 1/2 years ago and the left one went bad so had a new one installed in May of this year. the 02 sensors were all replaced at 95k with (oem) and now have about 75k on them.
I have burned thru cat's before in about a year and half on a previous vehicle, never in 5 months!. no cam installed it's all stock except a cai

 

[tooleyondeck]

it is welded in and since it has been welded in I have been hearing a small leak at cold start up, but it goes away after about 20-30 seconds and doesn't return until it has sat and been cold for 8 hours. I am dropping it off at the shop that installed it this afternoon so they check it in the morning when it is cold, I have told them about the leak before but they can never find it because it only happens when it is cold and doesn't appear to be the manifold. It has been like that for 5 months and the code did not show up until after I started running e85, so I am just wondering if it has anything to do with the tune for 92 and running higher octane e85 instead

Dumb question, but do you not have a flex fuel sensor?

 

[BlackBearPerf]

it might be a sensor then I am going to try and do a log file and see if anything is out of whack, the cat is aftermarket, both are actually had them replaced once about 3 1/2 years ago and the left one went bad so had a new one installed in May of this year. the 02 sensors were all replaced at 95k with (oem) and now have about 75k on them.
I have burned thru cat's before in about a year and half on a previous vehicle, never in 5 months!. no cam installed it's all stock except a cai

You can definitely do a data log for us and we would be happy to review it for you to see if we can identify anything.

 

[Doubeleive]

Dumb question, but do you not have a flex fuel sensor?

it is a flexfuel vehicle but the gmt900's do not have physical sensor

 

[Doubeleive]

You can definitely do a data log for us and we would be happy to review it for you to see if we can identify anything.

thanks I will do that, I appreciate the assistance in getting to the bottom of this.

 

[BlackBearPerf]

You are welcome, happy to help!

 

[Doubeleive]

went and did a log while driving it to the muffler shop to leave it for them to check where the small exhaust leak is in the morning and freaking just unplugged it and didn't save the log right

 

[Doubeleive]

You are welcome, happy to help!

apparently I am a inept retard, did a log and it shows 42kb, when i go to play it back on efi live it plays a few seconds and stops yet shows 17 minutes?
did another log, saved it and it shows 2kb...?????

 

[BlackBearPerf]

Do you have the older version AutoCal or the new AutoCal V3? If you have the older version, the AutoCal may be full. You would just need to plug it into your computer and open the EFILive Explorer program. In the lower pane, click on the Scan folder and delete any files. Then click on the Read folder and delete any files. That should free up space for a new data log.

 

[Doubeleive]

Do you have the older version AutoCal or the new AutoCal V3? If you have the older version, the AutoCal may be full. You would just need to plug it into your computer and open the EFILive Explorer program. In the lower pane, click on the Scan folder and delete any files. Then click on the Read folder and delete any files. That should free up space for a new data log.

i don't know what I am doing wrong, I have the autocal v2, using efi v8
when I play the last log file I just did (again!) when I load it only plays for about 7 seconds.
this recent file only shows 39kb, shouldn't it be like 1.5mb or something?
the autocal shows it has 4mb free out of 6mb

 

[BlackBearPerf]

It should be bigger but the older style AutoCal will have the log files open in the V7.5 Scan program. If you want to call our phone line, we can go over it with you and even remote into your computer to see what may be going on.

 

[Doubeleive]

It should be bigger but the older style AutoCal will have the log files open in the V7.5 Scan program. If you want to call our phone line, we can go over it with you and even remote into your computer to see what may be going on.

i gave up trying to just save it with the autocal and connected my tablet and just did a passthru log with efi
I sent 2 files, they will be from wesley.finch
hopefully I did it right this time

 

[Doubeleive]

and that was set on engine: e38 which I am not sure if it will show all 4 02 sensors?
if not, let me know which one I need to use and I will do it again