Car misfiring under boost

Foggy

Foggy

Member +
Right my ep91 is misfiring under hard boost. This only happens after been on the motorway for a while. It feels like fuel cut when it happens but i have a jam ecu so it cant be. No ecu light comes on either. My mods are jam ecu at 1.1 bar, ported wastegate, decat, aftermarket manifold, fmic and so on. Also my plugs are fairly new (ngk heat range 7). Any ideas chaps what the problem could be?
 
sx_turbo

sx_turbo

Lifer
possible break down of leads

or disi cap and rotor need replacing

or a plug has worn out.

might even be the ignitor (doubtful though)
 
aaronw

aaronw

Member +
mine started this yesturday, im pretty sure its plugs in my case.

im changing oil+filter n plugs tomorrow,i suggest plugs first for you.
 
Foggy

Foggy

Member +
I might give the leads a try and have a look at the plugs. I will have a look at the dizzy too.
Could it be the map sensor since im boosting over 1bar?
Also this doesnt happen all the time either. Day to day it runs perfect just seems to happen with the engine is running a bit hotter from the motorway use.
 
Foggy

Foggy

Member +
I looked at them there now they still look fairly new cant see any wrong with them. There whitey-grey around the tip if that makes any difference?
 
A

AdamB

Member +
Pretty sure the standard Map sensor is 2 bar, since its turbocharged and creating above atmospheric pressure, 1 bar map sensor will be no good.
As said, check the leads, dizzy cap and rotor arm. If their new plugs I can't see it being them, but it depends on how the engines running to how quick the plugs get killed.
 
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