S14A misfiring :(

[f11rfn]

Got s14a running stage 1 mods, driving normal its fine but on boost soon as you hit 3-4000 rpm it misfire and does not wan to go above the rev range. Dropped it to mechaninc he said airflow meter is the issue as he has a low mileage s15 from which he tried his AFM and it was fine, ive bought x2 used ariflow meters and it didnt fix the problem, is this a coincidence they were both faulty or am i missing something? bought the Afm from gduk so reputable seller. Any help would be good, he said coil packs are old but ok for now.

[m44t-xx]

Boost leak!!!!

Split pipe opening up under pressure

[f11rfn]

Boost leak!!!!

Split pipe opening up under pressure

But with s15 afm its ok?

[Mattharvey12]

sounds like boost leak to me

[f11rfn]

sounds like boost leak to me

On idle it is bit lumpy? any good jap car specialists in birmingham that can check it?

[f11rfn]

guy i got ti off said there was a hairline crack by the turbo wastegate but when i had mot done they couldnt find anything there?

[m44t-xx]

They aren't going to see a crack in the wastegate on An mot will need elbow off as a minimum to even see it. Assuming it's an internal wastegate?

[f11rfn]

They aren't going to see a crack in the wastegate on An mot will need elbow off as a minimum to even see it. Assuming it's an internal wastegate?

its standard turbo so i assume standard wastegate?

[m44t-xx]

Yea I should imagine so mate

[sxstu]

Have you checked coilpacks. Had similar problem. If you have spare or no someone with sx try there coilpacks. At least you can rule them out easyly

[f11rfn]

Have you checked coilpacks. Had similar problem. If you have spare or no someone with sx try there coilpacks. At least you can rule them out easyly

true im goign to get mates ones off and try them see what happens
thanks for your help guys

[JuicyCarbonFX]

How did you get on chap?
I just braved 17psi (only had car a month) and noticed it's doing the same as you described... just refuses to move past 4000rpm but as soon as I switch boost back to 10psi its right as rain :/

[yanaco2]

Are you running a chip / map ?