multiple mis-fire APS TT
Thread Starter
Intermediate
Joined: Feb 2015
Posts: 29
Likes: 0
multiple mis-fire APS TT
All,
I have an 06 Z06 with APS TT kit. I am making 966rwhp@17 lbs boost.
A little while back the car started running rough until she seemingly warmed up. I put new coil packs, wires and plugs in and still the same.
I just got from under the car and round that the connection on the drivers side front 02 is badly melted.
could this cause the random multi- misfire?
thanks in advance.... other than that I am going to swap out the crank position sensor.... running outta ideas here.
Help!
I have an 06 Z06 with APS TT kit. I am making 966rwhp@17 lbs boost.
A little while back the car started running rough until she seemingly warmed up. I put new coil packs, wires and plugs in and still the same.
I just got from under the car and round that the connection on the drivers side front 02 is badly melted.
could this cause the random multi- misfire?
thanks in advance.... other than that I am going to swap out the crank position sensor.... running outta ideas here.
Help!
Thread Starter
Intermediate
Joined: Feb 2015
Posts: 29
Likes: 0
Only code I get is the flashing engine symbol signifying multi random mis fire. I do not know if the code/ses has been disabled.... I'll get HP tuners and see.
gonna get to that damn wire by this weekend!
gonna get to that damn wire by this weekend!
Thread Starter
Intermediate
Joined: Feb 2015
Posts: 29
Likes: 0
just started pulling things apart... should have her tore down by this week end.
Does anyone know of an install video is... I can deduce what to do.. but seeing how things were done would definitely help out.
Does anyone know of an install video is... I can deduce what to do.. but seeing how things were done would definitely help out.
Thread Starter
Intermediate
Joined: Feb 2015
Posts: 29
Likes: 0
I've gotta drop the drivers side just to get to the 02 connection that burnt/badly melted.
I have a random mis-fire and this is what I discovered. Because it's so tight the only way for me to get to it is disassemble the drivers bank... PITA!!
I have a random mis-fire and this is what I discovered. Because it's so tight the only way for me to get to it is disassemble the drivers bank... PITA!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Drifting
Joined: Dec 2003
Posts: 1,755
Likes: 88
From: Pearland Texas
Man I wouldn't hassle with that O2. That's a lot of work for that. Id turn them off and see if the misfire goes away first. Parts swapping to find an issue should be a last ditch attempt. But you can still do a number of things with the car together and running. Like log the cam count to make sure the cam sensor is reading, also if the car won't start without a crank signal I believe. It will start with out a cam sensor though. More than likely its that O2 they like to blink to tell you your probably hurting the catalyst etc...
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Why would it overfuel? Without an O2 sensor signal it will just use the MAF/VE tables and not make any adjustments beyond that. If the MAF/VE tables are close then it will be fine.
If it's getting a WRONG O2 signal from a burned wire or whatever, then it could be making adjustments the wrong way currently.
I'd rather have no O2 signal than a wrong one (I actually unplugged an O2 sensor on mine a few weeks ago when this happened to me--used an impact wrench installing the sensor and I guess that ruined it. Fuel trims were maxed out and the car barely ran it was so rich. Disconnected it and drove home just fine)
I'd try it and see what happens.
Do you have a wideband on it?
Do you have HP Tuners?
If it's getting a WRONG O2 signal from a burned wire or whatever, then it could be making adjustments the wrong way currently.
I'd rather have no O2 signal than a wrong one (I actually unplugged an O2 sensor on mine a few weeks ago when this happened to me--used an impact wrench installing the sensor and I guess that ruined it. Fuel trims were maxed out and the car barely ran it was so rich. Disconnected it and drove home just fine)
I'd try it and see what happens.
Do you have a wideband on it?
Do you have HP Tuners?
Last edited by schpenxel; Mar 22, 2016 at 01:11 PM.
Thread Starter
Intermediate
Joined: Feb 2015
Posts: 29
Likes: 0
Why would it overfuel? Without an O2 sensor signal it will just use the MAF/VE tables and not make any adjustments beyond that. If the MAF/VE tables are close then it will be fine.
If it's getting a WRONG O2 signal from a burned wire or whatever, then it could be making adjustments the wrong way currently.
I'd rather have no O2 signal than a wrong one (I actually unplugged an O2 sensor on mine a few weeks ago when this happened to me--used an impact wrench installing the sensor and I guess that ruined it. Fuel trims were maxed out and the car barely ran it was so rich. Disconnected it and drove home just fine)
I'd try it and see what happens.
Do you have a wideband on it?
Do you have HP Tuners?
If it's getting a WRONG O2 signal from a burned wire or whatever, then it could be making adjustments the wrong way currently.
I'd rather have no O2 signal than a wrong one (I actually unplugged an O2 sensor on mine a few weeks ago when this happened to me--used an impact wrench installing the sensor and I guess that ruined it. Fuel trims were maxed out and the car barely ran it was so rich. Disconnected it and drove home just fine)
I'd try it and see what happens.
Do you have a wideband on it?
Do you have HP Tuners?
What if I just unplug the 02 without disabling in HPT? would this also prove or dis prove?
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
See what fuel trims and O2 readings look like for each bank. If those are normal then it probably isn't an O2 sensor issue IMO.
You can unplug the sensor to put it into open loop, but I think you have to reset fuel trims after you do that or it will keep trying to use what it remembers from the last time they were connected
I'd log first, check out readings for O2 B1S1, O2 B2S1, STFT & LTFT for both banks (separately) and see what you get.
You can unplug the sensor to put it into open loop, but I think you have to reset fuel trims after you do that or it will keep trying to use what it remembers from the last time they were connected
I'd log first, check out readings for O2 B1S1, O2 B2S1, STFT & LTFT for both banks (separately) and see what you get.
Drifting
Joined: Jun 2009
Posts: 1,730
Likes: 93
From: St. Petersburg Florida
See what fuel trims and O2 readings look like for each bank. If those are normal then it probably isn't an O2 sensor issue IMO.
You can unplug the sensor to put it into open loop, but I think you have to reset fuel trims after you do that or it will keep trying to use what it remembers from the last time they were connected
I'd log first, check out readings for O2 B1S1, O2 B2S1, STFT & LTFT for both banks (separately) and see what you get.
You can unplug the sensor to put it into open loop, but I think you have to reset fuel trims after you do that or it will keep trying to use what it remembers from the last time they were connected
I'd log first, check out readings for O2 B1S1, O2 B2S1, STFT & LTFT for both banks (separately) and see what you get.
Last edited by Dude_man; Mar 22, 2016 at 01:54 PM.
