C7 misfires
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,410
Likes: 3,964
From: Cape Coral, Florida
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
alright so update the shop I have it at right now, they said they have to get that piping replaced because the car isn’t reading “shxt” he said and he said it’s needed to be replace to get accurate information to diagnose the misfire…. So what my solution and what I worked out with them is to give them the headers I have and x pipe and they install it, so they can get accurate information(I GUESS)…. But he sounded very frustrated that I cut the pipe after the cats right by the headers and kept asking me why I did it. So just let me know if this sounds right.
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,410
Likes: 3,964
From: Cape Coral, Florida
The O2 sensor downstream of the cat only monitors the efficiency of the cat…it is not involved in fueling of the engine.
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
well my next steps are this, they got it on the install on the long tube headers and x pipe which has a spot for O2 sensor I don’t know what they’re going for because installing that won’t change nothing since I still will misfire and I need a tune to even have the car recon the change in flow and apparently that’s they’re belief
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
Ha, thanks for this, so tell me if this is the right step, they already have my headers and piping out installed a x pipe and is waiting on the long tube headers I’m giving them. So I’ll pay that and then I’m getting out of there
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,410
Likes: 3,964
From: Cape Coral, Florida
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
update, so got the headers installed and they told me they’re gonna tune the car how are they going to tune it if it’s misfiring on 3 cylinders….
also the box I ordered they want it and they have a box already of the same company headers, going to ask to see the headers when I make it to the shop and x pipe they have they say that it’s brand new.
also the box I ordered they want it and they have a box already of the same company headers, going to ask to see the headers when I make it to the shop and x pipe they have they say that it’s brand new.
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
update, I told the guy in text I’ll pay for you for what you’ve done so far now and such and I also stated that I just want injectors and spark plugs change on bank 1, I don’t want no tune since I wanna save money. I then get a call I was happy at first they said my car is all fixed but they tuned my car plus replaced all my plugs on both banks and injectors. And I have a pay the 850$ for they’re tune I didn’t approve what could I do?
Thread Starter
Intermediate
Joined: May 2025
Posts: 46
Likes: 1
Melting Slicks
Joined: Feb 2018
Posts: 2,126
Likes: 1,012
From: North Texas
Look, I understand your young at this game and just need to learn as I did at that age and I'm still learning at the young age of 75.
Now a little advice if you're interested.
These 'clowns' are just taking advantage of your young age and inexperience.
I'd be very surprised if they ever completely repair all the issues that your car has developed.
Get your car out of there and take it to the diagnostic shop that C5 Diag recommended.
Your car, your choice.
Now a little advice if you're interested.
These 'clowns' are just taking advantage of your young age and inexperience.
I'd be very surprised if they ever completely repair all the issues that your car has developed.
Get your car out of there and take it to the diagnostic shop that C5 Diag recommended.
Your car, your choice.