Hi Guys, I just want to thank you in advanced if you make it all the way through this post. I am at a loss of what is happening.

I am very mechanically inclined. I have successfully done my own engine swaps, diff swaps, head swaps, starters, clutches ect. I have no clue about tuning...

I have a very modified 2004 corvette, I bought it already modified and I am just learning about the car. I have had it for a few months and it has been running great. My last cruise with it was fine, nothing out of the ordinary and as usual after the drive I park it in my garage. The next time I go to take it out, I start it up, everything normal, I go to back it out of my garage and the shifter doesn't work. I quickly trouble shoot it and find the linkage at the shifter has broken and popped off. This is a simple fix for me. The whole point of this trip was to go to a car show with my son, so we missed out on that one. Anyways, I order a new shifter linkage cable and when it arrives I start to do the swap. This was done relativly easy aside from the long tube headers and typical exhaust issues pulling it out. The car has 3 02 sensors on it (no cats). The 02 sensors are the 2 upstream ones and one for the AFR wideband gauge.
I finished up the linkage swap and put everything back the way it was....(While I had it apart I disconnected the battery so I could pull in a stereo wire while i was working on the car anyways...) here is where the problem starts.

I go to start the car and it now runs super rich and wont barely idle, its stalls out and wont run and smells like a ton of fuel. I am puzzled. I rip it all apart again (relative to what I worked on) and i find that the o2 extension wires have been pinched as if the torque tube cover maybe pinched the extension wires. I know this wasnt caused by me because I clipped and stuffed the o2 extensions in after I tightend all the torque tube bolts
I go ahead and ordered new o2 sensor and extentions. pulled the exhaust off again and replaced them.... Carefully put everything back together and that still has not fixed the problem. I have tried switching the o2 sensors, i have checked all the fuses,
The car will not stay running.

My thoughts are, either the tune was lost while I had the battery disconnected... or the tuner tuned it with pinched o2 wires and now that i have fixed that and they arent pinched it is out of wack. I have talked to a tuner to get it retuned, but He is busy for a while. I have orderd HPtuners 3 and am wondering how hard it will be to trouble shoot this problem

Open to hear any ideas you guys might have.

 

The tune will "not" be lost if the battery is disconnected or die's. If a GM Tech 2 has been connected, that may re write to a stock calibration. You did not make comments that was done.

Unlikely it was tuned with frt 02's disabled, they would have been disabled by the tuner. You never know, it is not a normal or good practice. If they were disabled by the tuner & the SES disabled no fault or codes will be displayed.

From your comments it was running fine prior to you working on the shift issue. The left bank needs to see the the left bank O2 sensor as does the right, is it possible you have reversed these?

You do have diagnostic capability with your display, you can check & clear codes with that.

HP Tuners is a very useful tool both its scanning & editing capability. The problem you will have is the steep learning curve, it's a difficult software to navigate. You might find your car was not tuned with HPT, or the version's are not compatible, or the file is locked. If you know the original tuner that will help, although he does not sound helpful.

Your problem does not sound complexed from a tuning perspective or related. Reading the codes, making sure they are current is a good place to start.

 

thank you for the comment, I did try switching the o2 sensors, i tried connecting just one at a time and switching with one at a time. Nothing I have tried will allow the car to idle. I do have a obd2 reader scanner, but I need to do more research of what to look for... the reason i say that is. I plugged it in and the o2 sensors that are missing/not installed, were reading mv, which is odd, I cant wait to get my HP tuners so I can see a little bit more of what is happening. I dont plan on tuning it myself but i would like to get it to start and idle.

 

With the upstream O2 sensors disconnected you will read a bias voltage of 450 millivolts key ON with your scanner...what are you seeing ???...if you are seeing a millivoltage close to 0 the sensor wire may be shorted to ground...with the sensor harness reconnected you should see 200-800 millivolts that is switching...it will look like a sine wave if you never looked at an O2 sensor with a scan tool...if the sensor voltage is "stuck" low the PCM will interpret this as a lean mixture and will schedule more fuel (increased injector pulse width) and the car will run rich !!!

 

Deleting the rear 02's is a common thing to do However you must DELETE all the rear 02 sensing codes for the rear 02's 2 and 3--So they never pop up again
As far as the front 02's they are very important as the data they read is what sets the P/T fueling ALL the time The front 02's must have an average 02 reading from .400 to .550 millivolts and the minimum voltage should be like .100 and the max should be like .950 If your front 02s are flatlined at .450 in min/max and average means they are DEAD-- This will create RICH P/T fueling--Only by using a Wideband 02 sensor you can verify the "actual " 02 voltages but you still can see if the fronts are dead.
Long tube hdrs often create bad front 02 readings as they are placed 2-3 FT further aft than stock and do not read accurately---That's why LT's are illegal in most states as they make the 02's read RICH because of the further aft placed 02's- and they do NOT heat up properly-With tuning a tuner can somewhat correct the front 02 switching points to somewhat fix it But there is no 100% fix--- for LT headers----------If you have other issues send me a message and I will help you for free---