Problem-if anyone can help.
Thread Starter
Instructor
Joined: May 2015
Posts: 188
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From: FLORIDA
Problem-if anyone can help.
i installed Texas Speed Headers w/ X-PIPE. Recently tuned by Formato, I changed out cylinder 2 'wire' and 'spark plug'..) fixed a stubble problem i had ) now its misfiring agian in 2 and other cylinders. Issue is its misfiring other cylinders now and at WOT is pops and stubble agian.. Could headers cause this? or maybe change my spark plug wires to Taylor brand and put heat protection wires on them?
1) Can headers be shaking the spark plugs/wires to cause this misfire?? WOT it is causing the car to pop and break up.
2) Next step is stock tune, diagnose the vehicle see which cylinders are missing than take it in to dealership if its still missing.
1) Can headers be shaking the spark plugs/wires to cause this misfire?? WOT it is causing the car to pop and break up.
2) Next step is stock tune, diagnose the vehicle see which cylinders are missing than take it in to dealership if its still missing.
Last edited by SharkAttack15; Oct 29, 2015 at 07:09 PM.
Melting Slicks
Joined: Sep 2006
Posts: 3,248
Likes: 265
From: Louisville Ky NCM Lifetime Member 429 (Member Since 1993)
St. Jude Donor '12-'13, '16
What do you mean mods have to be "proven"? If you got a tune, your screwed. The dealers computer will find that in a heartbeat. There is a way in there system to tell how many times a mod has been done. And it only takes one, and GM will not cover it.
Thread Starter
Instructor
Joined: May 2015
Posts: 188
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From: FLORIDA
Car will be going in with stock tune obvious. they dont know about computer being programmed. They cant find out the computer has been messed with if stock tune is reflashed back to normal specs i work here :O
Last edited by SharkAttack15; Oct 29, 2015 at 06:45 PM.
Premium Supporting Vendor
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Chances are the tune is probably ok, my guess would be you have a cracked spark plug, or a spark plug wire that isn't properly put in. I would check all the spark plugs, especially if you didn't remove them during installation. If there is a small crack it will cause exactly what you are talking about.
Thread Starter
Instructor
Joined: May 2015
Posts: 188
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From: FLORIDA
Chances are the tune is probably ok, my guess would be you have a cracked spark plug, or a spark plug wire that isn't properly put in. I would check all the spark plugs, especially if you didn't remove them during installation. If there is a small crack it will cause exactly what you are talking about.
Replacing all wires with Taylor Wires 86245 8.2mm. As well as ordered some Spark plug heat covers 1200 protection. gonna buy spark plugs oem and replace all of them. and i will make sure everything is attached correctly.
Melting Slicks
Joined: Jun 2012
Posts: 2,226
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From: Thomas Texas
Before spending any money, run the car in a totally dark garage or driveway. Open the hood and look for sparks to ground from the wires, plugs, & coils. It may take 5 minutes for your eyes to get used to the dark and locate shorts.
Mildly glowing plug wires is totally normal its called the corona affect.
Mildly glowing plug wires is totally normal its called the corona affect.
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Burning Brakes
Joined: Oct 2012
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From: Katy Texas
OE plug wires are still the only wires I run, many performance shops pull the others and replace with the OE when diagnosing a misfire. Plugs and good OE wires a must. Even if flashed back to stock, GM can find out, there is a counter. I have the TSP headers with OE wires and plugs and have had no issues for 8000 miles. Proper tune helps. I did have a problem that was being caused by a bad ported throttle body, but as soon as I replaced that I was good to go.
Thread Starter
Instructor
Joined: May 2015
Posts: 188
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From: FLORIDA
OE plug wires are still the only wires I run, many performance shops pull the others and replace with the OE when diagnosing a misfire. Plugs and good OE wires a must. Even if flashed back to stock, GM can find out, there is a counter. I have the TSP headers with OE wires and plugs and have had no issues for 8000 miles. Proper tune helps. I did have a problem that was being caused by a bad ported throttle body, but as soon as I replaced that I was good to go.
yea upgraded plugs dont hurt for 60$ and im prob gonna get tr6/7 plugs.
Thread Starter
Instructor
Joined: May 2015
Posts: 188
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From: FLORIDA
Chances are the tune is probably ok, my guess would be you have a cracked spark plug, or a spark plug wire that isn't properly put in. I would check all the spark plugs, especially if you didn't remove them during installation. If there is a small crack it will cause exactly what you are talking about.
Hey I put in stock tune and still getting misfires. Headers are close to the wires could it be that or plugs cracked? Next step is changing out the plugs should I go upgraded or oem?
Last edited by SharkAttack15; Oct 30, 2015 at 12:18 PM.
Melting Slicks
Joined: Jun 2012
Posts: 2,226
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From: Thomas Texas
Now you found it as #2. Is that on the passenger's side? I don't remember.... #1 is the cylinder is the one farthest out front. #2 is on the other bank closest to the front.
Swap wire to next cylinder first before changing a spark plug. You have a spark plug wire that is shorting to ground. Run the car in a dark garage and you will see the spark from the wire to ground.
The factory AC Delco Iridium plugs are great spark plugs. If their heat range is fine, use them. Tried the NGK everbody said were great on my modded C6 and went back to the stock AC Delco plugs.
Swap wire to next cylinder first before changing a spark plug. You have a spark plug wire that is shorting to ground. Run the car in a dark garage and you will see the spark from the wire to ground.
The factory AC Delco Iridium plugs are great spark plugs. If their heat range is fine, use them. Tried the NGK everbody said were great on my modded C6 and went back to the stock AC Delco plugs.
Last edited by RussM05; Nov 2, 2015 at 07:17 PM.
Melting Slicks
Joined: Sep 2006
Posts: 3,248
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From: Louisville Ky NCM Lifetime Member 429 (Member Since 1993)
St. Jude Donor '12-'13, '16
And if you work for a dealer, you should have all of the information and diagnostic equipment to determine your issue. Otherwise, pick up the phone and call a GM engineer to assist in diagnosing your problem. That happens everyday.
Thread Starter
Instructor
Joined: May 2015
Posts: 188
Likes: 6
From: FLORIDA
Now you found it as #2. Is that on the passenger's side? I don't remember.... #1 is the cylinder is the one farthest out front. #2 is on the other bank closest to the front.
Swap wire to next cylinder first before changing a spark plug. You have a spark plug wire that is shorting to ground. Run the car in a dark garage and you will see the spark from the wire to ground.
The factory AC Delco Iridium plugs are great spark plugs. If their heat range is fine, use them. Tried the NGK everbody said were great on my modded C6 and went back to the stock AC Delco plugs.
Swap wire to next cylinder first before changing a spark plug. You have a spark plug wire that is shorting to ground. Run the car in a dark garage and you will see the spark from the wire to ground.
The factory AC Delco Iridium plugs are great spark plugs. If their heat range is fine, use them. Tried the NGK everbody said were great on my modded C6 and went back to the stock AC Delco plugs.
im gonna do it tonight see if i see anything in the dark.. you think it a bad wire or short?? it wouldnt be a cracked plug maybe?