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Old 11-26-2012, 05:11 PM   #18
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Quote:
Originally Posted by Medi0cr3 View Post
2011 2SS M6
Nightfury cam
Borla LT headers
Borla ATAK exhaust
jannetty tuned

P0171 - Quite often
P0131 - Sometimes
P0300 - Rare

Swaped O2 sensors, still present
Replaced #1 bank O2 sensor for grins
Replaced spark plugs with another set of stock, did not overtorque
Replaced plug wires
Did a continuity check for breaks, still thinking the ohm reading should not be above 1.00 ohms (true/false?)
Reloaded the tune
Replaced both header gaskets with GM stock ones for grins...

Short term fuel trims are maxed out on my #1 bank and only reset when I WOT @ 4k rpm.

Fuel trims stay maxed and this is killing my gas mileage.

I'm at a loss and no clue what else to look for...

Vacuum leak doesn't seem to exist. There aren't many vacuum lines on these LS3's

What is your Name?

Everything is on Bank 1

A misfire shows up as a LEAN condition and is not a tuning issue.

Bent valves, broken or weak valve springs, cracked spark plug, bad wires or connections, bad coil vacuum leak all can cause a misfire random or otherwise which will set the codes you have listed.

Log your misfire data to pinpoint the cylinder that is misfiring.

Send me Logs to look at and I will try and help you, but you must be my eyes and ears on the Car itself.

Ted.
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Old 11-26-2012, 05:29 PM   #19
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Just for kicks.Switch your coils from bank 1 to bank 2.It would eliminate a possible coil issue.Easy and free.
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Old 11-27-2012, 08:58 AM   #20
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Ted, What PIDs exactly do you need?

Motion427, I swapped #1 and #3 for grins, but didn't switch between banks.
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Old 11-27-2012, 11:41 AM   #21
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Double check the connectors at the injectors.
You can even remove 1 plug at a time to test it.If engine change sounds,you know that the injector is working,if not,you would have an issue with that cylinder.Can also use a 194 bulb and hook it at the connector to see if theirs fire at the injector connector itself (engine running).
Could be the intake gasket that is leaking.Can also remove the valve cover to see if theirs no broken valve spring and see if the valvetrain is working correctly.
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Old 11-27-2012, 11:56 AM   #22
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Ted, What PIDs exactly do you need?

Motion427, I swapped #1 and #3 for grins, but didn't switch between banks.
misfire current cyl #,s 1-8

1 and 3 are on the same bank. drivers side 1357 pass side 2468
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Old 12-06-2012, 11:47 PM   #23
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i would check all the grounds and make sure there are no burt wires or loose connections. look at the injector connections also to make sure there are no bent pins.
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Old 12-27-2012, 10:50 PM   #24
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running excessively lean can cause a misfire.
or a po300 aka random misfire.

if its lean enough it can go from being a random to a 301 302 303 04 05 06 07 08 based on what cylinder the crank sensor is seeing as a reoccurring misfire.

low voltage at a o2 sensor can indicate a lean condition.

generally speaking anytime a vehicle has misfire their is excessive oxygen present.
odds are it will throw a lean code along with misfire codes.
sometimes itll throw a o2 code in there too to screw with you.

so where the hell do you begin?
we need more data op.

not to mention all the aftermarket parts here dont help.

fwiw trims will rest during wot because of entering openloop.
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Old 01-02-2013, 09:14 PM   #25
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I'm currently deployed overseas and dont have direct access to my car. However, if anybody has any grand ideas I can have my friend take a look.

Things that need to be looked at are the wiring to grounds and trying the carb cleaner spray around intake and vacuum areas.

Thanks tho for takin a look at the thread. I'm lookin' at doing a motor swap in October. However, before I get anywhere near that, this issue needs to be addressed prior to. The car runs great at the track (6800 DA) due to WOT resetting fuel trims and running off the tune.
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Old 03-08-2013, 05:09 AM   #26
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I want to revisit this and see if I cant get anymore help from the members here. Background is that I'm currently deployed until the end of August and I have a car club friend looking after the car. He starts it once a week and lets the engine warm up to running temps and drives it around the block every couple of weeks.

Currently:
As of yesterday he started it and went inside then looked out the window and saw the whole vehicle shaking, so he went outside and turned it off. He said that it was ideling normal 850-900 rpm prior to him turning it off, but it was shaking a lot. He also said that when he hooked my turner up to it to check the CEL light that it threw the same codes that I have mentioned before in the OP. I know that souns vauge and I will have more details in the morning when he wakes up and can possible shoot video with his phone to show to me. Maybe the gas is going bad? Maybe an in injector fowling up? The plugs and wires are both brand new and installed properly and there is not an exhaust leak.

My first step would be to get him to take it to the dealership or a trusted shop we have in town to check for a wiring issue.

Second step is up to the possibilities and ideas that some people may have and I would appeciate any info.
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Old 03-08-2013, 09:49 AM   #27
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Did he do a compression test yet?
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Old 03-08-2013, 10:24 PM   #28
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a vacuum leak can cause shaking...
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Old 03-10-2013, 08:12 AM   #29
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You need to get a scan tool hooked up and find out which cylinders are counting misfires. Sometimes a dead cylinder will record misfires on the cylinder that fires next in line. If you have an entire bank that is the issue, check the cat if u have them. A plugged cat will take down an entire bank. If it is one cylinder then swap plug, coil, wire and injector with known good cylinder.
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Old 03-10-2013, 08:50 AM   #30
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The shaking is probably from the cam. The CPU may need to be re flashed, maybe the tune didn't stick. P0171 is fairly common. The cold settings may have to be tweaked I would start with who ever tuned it just to be systematic and rule that issue out ... If that's NOT the issue try to rule vacuum leaks. The old carb cleaner test.
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Old 03-10-2013, 12:31 PM   #31
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Quote:
Originally Posted by Mchlgrrsn View Post
If that's NOT the issue try to rule vacuum leaks. The old carb cleaner test.
An unlit propane torch works well and doesn't leave a mess.

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Old 03-19-2013, 04:12 PM   #32
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I had a issue kind of like this shortly after putting on my LT's. Somehow damaged one of the spark plugs on the 8th cylinder which caused it to misfire. Could not figure it out for the longest time. Replaced all plugs with better ones anyways and the misfire was fixed.
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Old 03-20-2013, 04:06 PM   #33
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Do you have a Hptuners datalog you can email? Oil smoke on startup?
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Old 05-12-2013, 10:17 AM   #34
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My money is on damaged plugs/wires!
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