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Location:
Maroubra
Registered:
June 2002
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ST185 Boost Problem
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Sat, 01 October 2005 13:45
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Hey guys,
Got a very annoying problem in my Grp A GT4... i'll do my best to explain it.
When boosting hard under load (ie anything over about half throttle) I seem to hit a fuel cut or boost cut at around 6PSI... it feels like a boost cut, but no dash lights come on and im able to keep driving wothout reseting the ECU. It feels as though the engine is hitting a flat spot. I have almost no power and it is reflex to back off when this happens.
However, if i boost up slowly (ie under half throttle) i can reach any PSI i set my boost controller to, which at the moment is set all the way closed so im running 8PSI ish.
Now, to try and solve the problem I have checked diagnostics and get no error codes, I have changed the plugs, igniter, coil pack, fuel pump,fuel filter, checked the resistance on leads which was 10 ohms, 8 ohms, 7 ohms and 5 ohms (working from furthest to nearest dizzy) checked dizzy and dizzy lead which was 3 ohms.
I am out of further ideas... has anyone come across this problem?? And if so how do i solve it? I am desperately trying to get the car ready to go to Wakefield on Monday and am really running out of time... This problem has only occured in the last 2 months and up until then i had happily ran 13PSI for 1 year without and problems whatsoever.
Any help or advice is greatly appreciated.
Regards,
John
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