robtek Member 26 Member For: 12y 10d Gender: Male Posted 15/06/13 03:15 AM Share Posted 15/06/13 03:15 AM Hey guys..Started a couple weeks ago, If I put my foot down in any gear and boost it, I.e. from the lights in first gear to 4000rpm, then back off or change to second and keep going, either way soon as I back off, the engine shudders and revs fluctuate quite a bit, the engine almost stalls> I've cleaned out throttle body> air intakes> plugs are still good> always run 98> let the engine warm up before pushing it> my mechanic gave the car a look over after changing the rear diff bush and said car looks goodAny ideas?Anyone have experienced similar issues?Cheers Link to comment Share on other sites More sharing options...
Paulie2256 Donating Members 7,441 Member For: 15y 9m 16d Gender: Male Location: SE Melbourne Posted 15/06/13 03:16 AM Share Posted 15/06/13 03:16 AM Prob valve springs Link to comment Share on other sites More sharing options...
robtek Member 26 Member For: 12y 10d Gender: Male Posted 15/06/13 03:24 AM Author Share Posted 15/06/13 03:24 AM Thanks for the quick reply man... I was really hoping it wasn't valve springs.. anything else it could be or are the symptoms a trademark for worked out or over sprung valve springs? Link to comment Share on other sites More sharing options...
freeze_dk I am dissatisfied with my current employment situation Donating Members 8,610 Member For: 17y 11m 10d Gender: Male Posted 15/06/13 03:31 AM Share Posted 15/06/13 03:31 AM Valve springs Link to comment Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 13y 7m 19d Posted 15/06/13 03:32 AM Share Posted 15/06/13 03:32 AM Is the car stock? If not, what mods? Anything changed? Link to comment Share on other sites More sharing options...
robtek Member 26 Member For: 12y 10d Gender: Male Posted 15/06/13 03:45 AM Author Share Posted 15/06/13 03:45 AM 13psi tune from the X3 flash unitMonza coolerK&N filterAPS Phase 1 (the ecu only I think)T5 with worn out clutch lolFlutter BOV130000kms on clock, very clean engine and no smoke etcAll the mods were done by previous ownershouldn't the stock valve springs still be ok? what's their max rwKW? or is my beast pumping out too many rwKW? Link to comment Share on other sites More sharing options...
Paulie2256 Donating Members 7,441 Member For: 15y 9m 16d Gender: Male Location: SE Melbourne Posted 15/06/13 03:48 AM Share Posted 15/06/13 03:48 AM Valve springs are like shock absorbers, they wear out after a while and go soft.Still only assuming it's the valve springs though. Link to comment Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 13y 7m 19d Posted 15/06/13 04:12 AM Share Posted 15/06/13 04:12 AM What model car? Link to comment Share on other sites More sharing options...
robtek Member 26 Member For: 12y 10d Gender: Male Posted 15/06/13 04:14 AM Author Share Posted 15/06/13 04:14 AM 2003 BA XR6T Link to comment Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 13y 7m 19d Posted 15/06/13 04:27 AM Share Posted 15/06/13 04:27 AM At 13 psi your valves will be floating like crazy with ba stock springs. Link to comment Share on other sites More sharing options...
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