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 Old 01-11-2018, 08:49 AM   #1
 
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Default Cylinder Misfires

Hey all,
Did some research on the forum and found some similar situations to what I'm experiencing but no solid definition on that the issue really is.

Had a misfire in cylinder 1 along with hesitation under load, replaced the coil pack since the spring inside was bent to one side and all of the spark plugs with NGK's - the previous ones looked fouled out.

After doing that, I noticed improvement in my cars conditions under load, however now I am experiencing the hesitation again as well as a misfire in Cylinder 2.

I've read it could be the plugs, coil packs, boost leak or injectors.
Anymore insight would be helpful.

I've attached a log and here our my current mods and vehicle info.
2007 MS6 97k miles.
Timing redone,
NGK spark plugs
Catless Downpipe
Autotech HPFP Internals
Forge V1 BPV
Cobb SR Intake
JBR Turbo Inlet

Thanks in advanced
Attached Files
File Type: csv datalog10.csv (7.8 KB, 2 views)
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 Old 01-11-2018, 09:28 AM   #2
 
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missfire dont just mean spark issur, it can be fuel related or compression related or even be the valve that need a good cleaning with a nut blast....

You checked the first thing but next you could follow by a compression test and if your engine isn't worn out, you can check if it happen at cold start or also while running.

A leaking injector let fuel accumulate on the piston and the car get a very bad iddle but usually once that fuel is burned, the engine would recover and run fine. You can check the DIZI pressure when you stop the engine, it should goes from around 450 to above 1000 and stay above 1000 for a while. If it drop after few minutes at rest, it could be an injector.

97k, if you ran the egr for a long while and your turbo smoke a little bit, you could have your intake valve and runner very dirty to the point of not allowing enough air into the chamber. To know about it, you have to remove the intake or try to check with a snake camera....But it is a common problem with direct injection engine and even worse with turbocharged ones.
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 Old 01-11-2018, 10:06 AM   #3
 
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A few questions:

Are you stock tune or on a Cobb OTS tune?
Was your timing redone at a dealer or did you do it?
What gap are your new spark plugs set to?
Do you have any CELs?

Also when you give us a datalog to look at, make sure you do a consistent pull from 3000 RPM to 6000 RPM+ at least. The tiny 900 RPM window of WOT you uploaded isn't worth shit really. I did notice your boost isn't even hitting 15.6 psi which is the stock boost level. I suspect you have a boost leak but it likely isn't the only issue.

Do a boost leak and compression test on all 4 cylinders and report back.
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 Old 01-11-2018, 03:31 PM   #4
 
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He's in Utah. A slight underboost is likely a result of cold temperatures.
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 Old 01-12-2018, 01:35 PM   #5
 
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Originally Posted by Jeff23spl View Post
missfire dont just mean spark issur, it can be fuel related or compression related or even be the valve that need a good cleaning with a nut blast....

You checked the first thing but next you could follow by a compression test and if your engine isn't worn out, you can check if it happen at cold start or also while running.

A leaking injector let fuel accumulate on the piston and the car get a very bad iddle but usually once that fuel is burned, the engine would recover and run fine. You can check the DIZI pressure when you stop the engine, it should goes from around 450 to above 1000 and stay above 1000 for a while. If it drop after few minutes at rest, it could be an injector.

97k, if you ran the egr for a long while and your turbo smoke a little bit, you could have your intake valve and runner very dirty to the point of not allowing enough air into the chamber. To know about it, you have to remove the intake or try to check with a snake camera....But it is a common problem with direct injection engine and even worse with turbocharged ones.
Originally Posted by flapjack View Post
A few questions:

Are you stock tune or on a Cobb OTS tune?
Was your timing redone at a dealer or did you do it?
What gap are your new spark plugs set to?
Do you have any CELs?

Also when you give us a datalog to look at, make sure you do a consistent pull from 3000 RPM to 6000 RPM+ at least. The tiny 900 RPM window of WOT you uploaded isn't worth shit really. I did notice your boost isn't even hitting 15.6 psi which is the stock boost level. I suspect you have a boost leak but it likely isn't the only issue.

Do a boost leak and compression test on all 4 cylinders and report back.
Sorry guys completely uploaded the wrong log, this one is the right log.
In the log you'll see at 3.3 seconds quite a bit of knock, not sure if its related to engine noise.
I am on a COBB OTS Stage 2 tune. I bought this car about 4 months ago and I added the DP and Internals too it.
The previous owner had a local speed performance shop here do the timing.
It wasn't until about a week or two that it started doing this.
I bought the NGK Iridiums- the gap is at .032
The only CEL I have but I reset it with my AP is the cylinder 2 misfire, last week it was cylinder 1 misfire until I replaced that coil pack.
I will do a a boost leak and compression test this weekend. I have also attached the correct log in the interim.
Thanks for the fast responses!
I know I need to adjust my AFR's and such I have an old version of ATR from years ago that still works, I just cant edit the OTS maps with it unfortunately so I will need to start from scratch and re tune it once I get the following issue(s) resolved.
Attached Files
File Type: csv datalog12.csv (18.4 KB, 4 views)
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 Old 01-12-2018, 02:08 PM   #6
 
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Gap the plugs at .026 - 0.28 and report back.
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 Old 01-14-2018, 09:25 AM   #7
 
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Originally Posted by trifdignn View Post
Gap the plugs at .026 - 0.28 and report back.
Agree. .032 is way too large. I'm surprised OP is not getting spark boost blow out. High boost and big gap = boost blowing out the spark, causing misfire.

At stage 2, even .028 may be too large. Set them at .026.
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 Old 01-15-2018, 08:01 AM   #8
 
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Gap fixed it. I put them at .026.
Damn I feel like an idiot.
'
Thanks for all your help!
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 Old 01-15-2018, 05:34 PM   #9
 
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In the random event you experience more misfires or specifically the p0302, lucas oil fuel system cleaner cleared mine up for the past two years or so. There's three bottles available, the mid sized one technically treats up 3 tanks worth of gas so something to consider if you using it is the concentration levels. It'll work though. And you should notice half way through the tank a smoother running engine.
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 Old 01-16-2018, 08:14 AM   #10
 
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Originally Posted by Marcus View Post
In the random event you experience more misfires or specifically the p0302, lucas oil fuel system cleaner cleared mine up for the past two years or so. There's three bottles available, the mid sized one technically treats up 3 tanks worth of gas so something to consider if you using it is the concentration levels. It'll work though. And you should notice half way through the tank a smoother running engine.
WTF? He just said he fixed it. LOL.
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Originally Posted by Thor Hammer View Post
WTF? He just said he fixed it. LOL.
Like I said, in the random event he gets a misfire code again. Reeeelax.
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Intake Valves/Fuel Injector's never serviced

Corksport: IC.RMM.TIP.FSB.Tubes.Strut Tower.JBR: 70a Sides.SSP.51r SURE: Dreadnaught.Juggernaught.Anchors.FlowM6.
Hypertech.MS CAI & SRI.Turbosmart DS BOV.Cobb EBCS.AT HPFP.Deatchsworks.CPe SafeSeals.Redline Trans.Diff. Motul Brake Fluid.
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To Install: CS Turbo/IM/DP/3.5 MAP/tubes/OCC, APv3, DM EGR, VG Antennae, SURE Full3 Aeros/Rad Hoses
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