R33 Gtst, Missing Flatspot Cant Figure It Out

[stump_69]

Hey guy's

My 33 is up the duff missing a little on idle and alot while driving on and off boost.

Quick idea of the build

Series 2 gtst

Rb25

Gtx3076

Haltech plug and play, wideband kit

740 side feed injectors

Exhaust, front mount

Everything to support 300kw

In the last few weeks its starting playing up, since chasing the miss ive done the following

Swapped cas

Swapped coolant temp sensor

Coilpacks swapped

Coil loom swapped

Injectors flowed and tested

Vacuum lines checked

02 sensor for wideband replaced

Compression test was ok

Two sets of plugged tried, gaps checked

Cleaned aac valve

The only thing that stood out, the fuel pump has a aftermarket relay that was melted but the fuse wasn't blown, the wiring is all good

Ive since replaced the relay setup, but no difference. Could my fuel pump be causing the problem?

So over it, please help!

[Hadouken]

Boost leak

Afm

[stump_69]

Air flow meter is deleted

Holds boost 100%

[89CAL]

If your fuel pump was the issue then you should see it on the wideband

Can you plug into the Haltech and look at what its doing? Log a run when it plays up and look back over it

[Ben C34]

Holding boost has nothing to do with being able to rule out a boost leak , however although bad it shouldnt cause the miss you are experiencing while using a map sensor.

[Ben C34]

Do a compression test

[tridentt150v]

do a fuel pressure test

[Ben C34]

do a fuel pressure test

Nah, that would show as an issue with the wideband.

But might as well rule it heaps far out.

[stump_69]

Hey guy's,

Thanks for the responses.

Checked all cooler pipes cant find a leak, also replaced vac lines

Compression test was good. Approx 150 across all 6

I only have a short trip to work and I've noticed that once the cars warm the misfire goes away and it drives perfect again?

What controls the cold start, maybe its related

Thanks in advance