My poor NG900 keeps having issues, this time it's hesitation at high boost 0.8~0.9 according to APC gauge.
Previously i attributed this to my modded fuel pump (from a Golf II GTI) blowing hoses inside the fuel tank and dropping fuel pressure but this time when i checked everything was fine.
Also this time it feels like something different. Previously when i had low fuel pressure the car would hop during high boost but this time it hesitates and just starts shuddering(?).
It's hard to accurately describe the feel and sound, normally it goes BWAAAAAA but now it goes BWAAARRRR... , the RRRR part being where it starts hesitating. (feel free to laugh but i can't think of a better way to describe it without taking video/audio)
The APC gauge still goes to the red as it should because i've set the turbo pressure to 1.25bar, no overboost.
No oil smoke or smell, no blowby, no CE errors, no SID dings. Also i have my doubts that it's a misfire, because my dad's Mercedes had a misfire for a while so i know how that feels and sounds.
Other thing i noticed is that my DIC doesn't do the 5 second spark plug burn off anymore.
And lastly i checked all the spark plugs (all were ok), cleaned them and set the spark gap to 1.0mm with a feeler gauge, this didn't help.
What should i check now? I would like to get it fixed before i do the king cobra pipe (55560602) upgrade.
Ps: i still have the worn ignition switch but i have installed an auxiliary switch to bypass the bad contacts.
Previously i attributed this to my modded fuel pump (from a Golf II GTI) blowing hoses inside the fuel tank and dropping fuel pressure but this time when i checked everything was fine.
Also this time it feels like something different. Previously when i had low fuel pressure the car would hop during high boost but this time it hesitates and just starts shuddering(?).
It's hard to accurately describe the feel and sound, normally it goes BWAAAAAA but now it goes BWAAARRRR... , the RRRR part being where it starts hesitating. (feel free to laugh but i can't think of a better way to describe it without taking video/audio)
The APC gauge still goes to the red as it should because i've set the turbo pressure to 1.25bar, no overboost.
No oil smoke or smell, no blowby, no CE errors, no SID dings. Also i have my doubts that it's a misfire, because my dad's Mercedes had a misfire for a while so i know how that feels and sounds.
Other thing i noticed is that my DIC doesn't do the 5 second spark plug burn off anymore.
And lastly i checked all the spark plugs (all were ok), cleaned them and set the spark gap to 1.0mm with a feeler gauge, this didn't help.
What should i check now? I would like to get it fixed before i do the king cobra pipe (55560602) upgrade.
Ps: i still have the worn ignition switch but i have installed an auxiliary switch to bypass the bad contacts.