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

 

Might want to check for a Coil Pack failure. Also, could be the injector.

 

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 ?

 

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 !

 

Hopefully just a coil, check the oil for intermix, do not drive.

 

What is the codes you throwing? What other mods besides a tune? Details about tune, boost, afr, etc.

 

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.

 

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...

 

^ x2

It looks like you have a Cobb Accessport (since you are looking at Lambda values), you can read the CEL codes using that.

 

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

 

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.

 

probably not stock turbos...