Post cat 02 lean?

[AlleyCat]

I do not have cats nor post 02 sensors. Now when I go full throttle she hits the wall. I do not know what is going on. Partial throttle and cruising is just fine.

 

[Tape]

You need to let your Tuner take care of this.

 

[AlleyCat]

The tune worked before. I do not think it is tune related. I will take it one step at a time. Exhaust shop tomorrow. Also maybe my ported snout cracked? It is just not the code. It is hitting a wall when I put the pedal to the metal.

 

[Magnified]

No other changes / symptoms evident? No change in sound? Sluggish, rough, or other changes in non-WOT performance?

 

[AlleyCat]

Exactly. Runs great. Until I get on it.

 

[Magnified]

I think something changed in the tune. Any low voltage or long time sitting for the car? Admittedly, this was a generation ago, but on the GTO I experienced a partial reversion to the stock tune after a low voltage incident (this is supposed to be impossible, but nevertheless it happened). With a long distance retune everything resolved. Either that or the sensor itself is bad. Somehow, the computer is reading code telling it to clip your wings because of the data from that sensor - either the sensor is sending wrong data, or a part of the programming is responding when it should be (and may have been formerly) deactivated or modified by the tune (or the physical structure of the computer was damaged / changed - this was what it looked like at one point on that GTO but turned out the ECM was not damaged). Just my two cents - I'm not a HC specialist like these other guys by any means, however. Hope you can get it corrected without any major drama.

 

[AlleyCat]

I think you are on to something.
Thanks

 

[Magnified]

Actually this happened twice, and the second time I just put a battery tender on the car and as long as it didn't drop into a low voltage state everything was fine. The second time was a remote retune, the first time I took to the original tuner in person, and we were stunned. Some of the tables and changes had been changed back to the original tune, and some had not (and of course, the car had not had a tuner anywhere near it). If this info is of any use, I'm glad - at least the frustrated road to fixing it might have helped other folks too.

 

[AlleyCat]

Mr. Barth states it is not the tune. I noticed on the onboard while upshifting the FAR goes to richer than stoic. That is what it is suppose to do. On a full throttle downshift from 50 usually I will go sideways if I do not back off. Now she sputters and hits the wall. The FAR swings the other way. No fuel. So I replaced the fuel cap and cannister. But not the egr relay. I ordered that. It can have E85 sitting in there. The Dodge dealer has no time for me. lol. If it is not the egr relay then I think either the Livernois dual pump is going out and/or the Kenne Bell boost a pump.

 

[Magnified]

Interesting. Sorry I was of no help. Any idea why the pump or BAP would only be wigging out in that one situation?

 

[AlleyCat]

Nope. Not sure it is that. I am lost right now. Reaching out to a few shops in Tucson and Phoenix. Once I know I will let the board know. No need to apologize. Thanks for trying.

 

[AlleyCat]

Fixed! Either I had bad e85 with excess water in it or someone put some water in my tank. I had 4 gallons of e85 and I just put four gallons of 91 in there. Walla. It is all gone! Runs fine except for the choppy idle as it is tuned for e85. So running rich. Very weird. Especially when I got the loose gas cap symbol a couple of weeks ago.

 

[fumanchu182]

Fixed! Either I had bad e85 with excess water in it or someone put some water in my tank. I had 4 gallons of e85 and I just put four gallons of 91 in there. Walla. It is all gone! Runs fine except for the choppy idle as it is tuned for e85. So running rich. Very weird. Especially when I got the loose gas cap symbol a couple of weeks ago.

how many cold starts have you done to piss off your neighbors that they would want to do that? Joking... however so you have an E85 tester?

 

[AlleyCat]

Ha. Now I have a locking gas cap and park her in the garage 100 percent of the time. I asked the fuel station where they get the e85. TX. I remember about two months ago TX was in the news due to massive rain storms and flooding. I will never know. Yes I tested yesterday. It is a pain. But it is necessary.

 

[AlleyCat]

I drove half way to NM yesterday and then circled back to Tucson dumping the 50/50 mixture. Then I filled up at a different station that has e85. I held my breath as I floored her at 50 to make sure it was the fuel. My baby started going sideways. She is back!
I am going to get a professional injector cleaning at the dealership in case there is a little rust on the injectors and or other parts.