R34 Gtt Misfire

[stranger12]

Hi all,

Just changed the turbo exhaust manifold gasket and car is much quiter

Also changed the plugs which god knows how long they were there with which were bkr5 to bkr6

Car runs fine and did a zero to sixty under 6.4 as that is how i am measuring its power:D

But two issues from 4k upward the car seems dead and power band is flat . As far as i know the neo moves from 5 psi to 7 but that isnt working i guess

Also sound of turbo is lesss

Second issue is misfire

You can hear the missess every now and then when car is standing idle or when reving and it revs down you can hear the spits backs

What can it be?

Plug changed( could it be too cold for my engine?)

Coilpack cleaned and used dielectric on it

Turbo gasket fixed

The fuel canister pipe was leaking a bit of air which i fixed it but no improvement

Does the consult software tell you anything ?

How would you narrow the misfire?

Many thanks

[FireFox-89]

Hi all,

Just changed the turbo exhaust manifold gasket and car is much quiter

Also changed the plugs which god knows how long they were there with which were bkr5 to bkr6

Car runs fine and did a zero to sixty under 6.4 as that is how i am measuring its power:D

But two issues from 4k upward the car seems dead and power band is flat . As far as i know the neo moves from 5 psi to 7 but that isnt working i guess

Also sound of turbo is lesss

Second issue is misfire

You can hear the missess every now and then when car is standing idle or when reving and it revs down you can hear the spits backs

What can it be?

Plug changed( could it be too cold for my engine?)

Coilpack cleaned and used dielectric on it

Turbo gasket fixed

The fuel canister pipe was leaking a bit of air which i fixed it but no improvement

Does the consult software tell you anything ?

How would you narrow the misfire?

Many thanks

You could swap the coil packs around to see if you can localise the cause.

[stranger12]

One point to add is , my coil pack connectors click things that ensure the coil is in tight is place is broken however i check it and all are in all the way

Also engine light , anti slip and hicas came on

I did move out the plugs and each caused the engine to run worse suggesting they are working

[GTSBoy]

You've left a sensor disconnected.

[stranger12]

Everything is connected

[GTSBoy]

Also engine light , anti slip and hicas came on

You've left a sensor disconnected.

Everything is connected

Pick two out of the above 3 to be true.

[stranger12]

could it be the wiring , is there a do luck wiring for rb25 ?

[stranger12]

I think i have just figured out the issue

Here it is , i cleaned the plugs and applied dielectric to it to the round of the coils and then inserted the jacket or isolator

Now in the process one of the plugs had its spring come out as it seems it was glued to the based as with all other ones so i manually inserted it in and put the coil back but it was loose so had to hold it by hand while putting that single coil on the plug

As i changed the plug , it could have dropped out so there is bo spring in there which can mean one of the coils is playing up

I need to open then all again to check, can the spring cause such issues and if so can you get the spring on its own ?

[hardsteppa]

You need to search more. And yes.

[stranger12]

haven't been able to find the spring so looks like I need to get another coil