Missing under full boost?

[Turbo Habanero]

So i seem to have what is a miss fire but only when i have the boost turned up to 12 spike.

if i turn it down to like 9 it's fine.

Any idea's on what is causing this?

Stock injectors and AFM

 

[Quin]

What plugs and what are they gapped to?

 

[Turbo Habanero]

(Can't remember one of these two) Bk7Re/BkR7e GAP .28

Not 100% sure if it is boost related or if its just bad #3 valve cover letting some oil on the plugs.

But like i said only happens when boost is turned up and when i get past about 4850rpms full throttle

 

[jonahs_supra]

well since i know you have a tps problem
i would start with that

try cleaning your ignitor ground

 

[Turbo Habanero]

I didn't think it was the Tps cause it happens whether my Tps is causing a CEL or not.

But I do know it Fucks up. Just figured if it was the Tps it would do regardless of boost being turned up or down.

 

[jonahs_supra]

I didn't think it was the Tps cause it happens whether my Tps is causing a CEL or not.

But I do know it Fucks up. Just figured if it was the Tps it would do regardless of boost being turned up or down.

well that im unsure of
but i say fix tps 1st then tackle other problems

 

[KMinAF]

I just went through this with my car and found a faulty injector to be the cause.

 

[nothingbetter]

12lbs is quite high boost on a stock engine and also right around the point where fuel cut hits. Maybe your fuel pump isn't able to keep up so your running lean enough to cause a misfire. Just an idea. Do you have a wideband O2 sensor?

 

[Turbo Habanero]

12psi high for stock engine? Or stock fuel setup?

And yes I have a uego and its at about 11.3 at 5,000 rpm

---------- Post added at 03:39 PM ---------- Previous post was at 03:38 PM ----------

12psi high for stock engine? Or stock fuel setup?

And yes I have a uego and its at about 11.3 at 5,000 rpm

 

[Quin]

That's about right for fuel cut on a stock car. Your sig says you have 560s and a Lex, though? Fix your codes first then report back.

 

[Turbo Habanero]

I have them but i uninstalled them because of this problem to see if it would go away but it did not.

Any how my TPS went crazy tonight it was having so much problems idle changing like crazy S-AFC reading %35 throttle at idle

A couple times it would hold a idle at 350rpms and AFR's would be at 10.00 with black smoke pouring from the exhaust.

So i started moving the TPS wire a little and could hear it shorting out and changing the idle.

After playing with it a bit i can feel the difference in the car at WOT Smoother no missing and seems to pull a lot harder.
But of course problem comes back soon after.

 

[jonahs_supra]

Victory is yours lol
Get a new one on there and happy boosting