Rb26 Missfiring Cyl 1 Constantly

[GTR260]

Hi guys, has anyone had this problem before? My 260rs is stock as a rock at the moment, it has a missfire only on cyl 1.

Compression is perfect

I have replaced coils with new splitfire items

Tried known working sensors off a mates car, afm, tps, aac,cas

Changed injectors

Changed spark plugs

Changed ecu's r33 gtr & pfc could make it better with power fc but not right

Have checked everything for leaks or loose clamps ect

Could it be something with the harness? Or something simple?

An

[ido09s]

Ignitor?

Are all the pins in the wiring harness in good condition and pushed in correctly.

Given its only cylinder 1 i would think it would be something in the wiring

[The Dan]

Check power to the coils and injectors

[GTR260]

It has spark and injector pulse! It also has a idle hunt from 2000rpm to 1600 and then back to 2000rpm

[RRob]

Inlet manifold gasket.....?

[GTR260]

they have been replaced

[GTR260]

Would a stuffed throttle body seal cause it to do this?

[rob82]

Would a stuffed throttle body seal cause it to do this?

Unlikely - if you have fuel and spark on that cylinder than it's time to check compression. Have you even pulled the spark plug out to see what it looks like? Might just be easier to take it someone that knows what they are doing. It may take my an hour to write out all the things you need to check but if I had the car and 10min I would be able to find the cause.

[SargeRX8]

To create the explosion, you need fuel, air and spark. You have fuel and spark...

[GTR260]

The car has been at autosport in sydney for 5 weeks and they couldn't fix it,

compression is even across the board

it's running a lil lean if anything as the plugs are white

drive fine when on boost!

will be pressure testing the inlet tomorrow to try find a leak but have already been over every hose and clamp associated with it,

the only thing on the inlet that wasn't replaced with new items is the throttle shaft seals! it needs to be getting the extra air from somewhere!

will post how i go tomorrow

[GTR260]

Unlikely - if you have fuel and spark on that cylinder than it's time to check compression. Have you even pulled the spark plug out to see what it looks like? Might just be easier to take it someone that knows what they are doing. It may take my an hour to write out all the things you need to check but if I had the car and 10min I would be able to find the cause.

mate if u can fix it in 10 mins I'll give u a $100 dollars, Should be a easy $100 for u