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New custom Cobb tune now # 3 cylinder dead?

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Old 09-12-2017, 04:21 PM
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New custom Cobb tune now # 3 cylinder dead?

To all ,


I just had a custom Cobb tune performed on a dyno along with a 5 bar FPR.
Less than 100 miles later check engine light comes on, rough nasty idle & # 3 cylinder dead?

Any ideas what happened?

Thxs
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Old 09-12-2017, 04:23 PM
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Might want to check for a Coil Pack failure. Also, could be the injector.
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Old 09-12-2017, 04:53 PM
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Plugs & coils were replaced less than 5k miles ago.

Injector & leak down test is next.


I did drive it over 200 miles in its current state from Lime Rock Ct.
to NJ .

Any engine damage ?
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Old 09-12-2017, 05:12 PM
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The fact that you changed coil packs just 5K miles ago is no guarantee that a coil pack didn't bite the dust. The stock coil packs (even new ones) aren't that bulletproof. I would check #3 to make sure you don't start pulling things apart for nothing.
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Old 09-12-2017, 06:59 PM
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The fact that you changed coil packs just 5K miles ago is no guarantee that a coil pack didn't bite the dust. The stock coil packs (even new ones) aren't that bulletproof. I would check #3 to make sure you don't start pulling things apart for nothing.
Absolutely correct !
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Old 09-12-2017, 08:46 PM
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Hopefully just a coil, check the oil for intermix, do not drive.
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Old 09-12-2017, 09:26 PM
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What is the codes you throwing? What other mods besides a tune? Details about tune, boost, afr, etc.
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Old 09-13-2017, 07:35 AM
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Cobb tune, headers, K24's, IPD plenum, 3" x-pipe, Evoms intake system, 5 bar FPR, 1.0 bar waste gate accuatators , 3.5 inch Evoms intercoolers.

Just check engine light is on now.

On the cobb read out it showed one Lambda bank @ half the value of the other Lambda bank. The good Lambda bank was reading ~18.5 while the bad side was around 8-9.

Thxs in advance.

Last edited by RDS993; 09-13-2017 at 12:14 PM.
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Old 09-13-2017, 08:12 AM
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The "Check Engine" light will have an associated code. That should tell you more of the story. If you don't have a Durametric, you may get some information using a generic OBDII reader...
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Old 09-13-2017, 09:11 AM
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^ x2

It looks like you have a Cobb Accessport (since you are looking at Lambda values), you can read the CEL codes using that.
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Old 09-13-2017, 09:45 AM
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Let me know if I can help with the diagnose. Something is off. 99% not a dead cyl but something else.
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Old 09-13-2017, 11:23 AM
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Let me know if I can help with the diagnose. Something is off. 99% not a dead cyl but something else.
ok- will do! thxs.
Its at the shop now. So far they said the #3 cylinder is getting fuel. There is oil gas mixture around the cylinder & on the header bolts around # 3. Not a lot but some.


Thxs in advance
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Old 09-13-2017, 12:09 PM
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Just an FYI that you probably already knew but with your list of mods I would be willing to bet that you are probably pretty close to maxing out the stock injectors even with the 5 bar reg.
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Old 09-13-2017, 12:12 PM
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Just an FYI that you probably already knew but with your list of mods I would be willing to bet that you are probably pretty close to maxing out the stock injectors even with the 5 bar reg.
Understood.
It made 560 lb/ft of torque on the dyno easily.
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Old 09-14-2017, 02:51 PM
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probably not stock turbos...
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