Overfueling / Underboosting When At Temperature

[str8 6 turbo]

Gdae, I've recently brought a 2003 ba xr6 turbo falcon, its done 100,000kms now. now my problem is a lack of boost when at operating temperature, obviously over-fueling is a consequence. Any wanted response from the turbo after 2500 - 3000 rpm results in that over-fueling. I've cleaned and checked all the intake pipes, also replacing all the factory hose clips with the hex head variety. The wierdest part about this happening is that I get full reliable power and full boost before the engine has come up to temperature, power then fades as operating temp is achieved. ive owned a few straight six turbo engines (the nissan RB skyline series) and also have rebuilt them plenty of times with no hassle, but this BA has completly stumped. are the turbo seals gone? or perhaps an ignition problem, hopefully just a sensor (boost solenoid) but either way I'm at a loss, so if anyone knows or has had this problem before could I please get a solution to my irritating problem?

[Henz]

What do you mean by lack of boost? Do you have a boost gauge and it's reading zero psi? Or does it just feel sluggish?

I doubt it's turbo seals, don't think I've ever heard of a t doing them, although there common on imports. Boost solenoid maintenance is meant to bring back 1psi in some cases, so you could try that.

Is the car spluttering/missing over 2500-3000? If so try doing spark plugs and checking your coilpacks. Just pull then out one at a time and if there's white marks where they've been earthing out they need to be replaced.

[str8 6 turbo]

G'day mate, its probably incorrect to say losing boost, but when the engine gets to temp, from 2500 - 3000rpm onwards, anything over quater throttle and she starts popping, (similar to the sound of over fueling) and losses huge power. I serviced the solinoid today also cleaned the throttle body, put a meter over the coils and resistance was reading fine on all 6. however I did take out the spark plugs and cleaned em and chucked the feeler gauges on em, algud, except yes they were all quite white in colour, silly me thought the mixture was lean and went off on a tangent. ive got a little power increase today but not 100% Thanks mate, I'll take your words of wisdom and go grab sum new iridim plugs. I'll be sure to reply either good or not so good news. cheers again.

Edited 12/02/11 08:19 AM by RHR
No need to quote above post. USE FAST REPLY

[str8 6 turbo]

gdae,

just put the new iridium plugs in, goes at lest 50% better. put still a slight problem around 5000rpm with the same overfueling sound as last time when full throttle. any ides whats wrong there? still not enough spark when vct kicks in maybe?

[freeze_dk]

I've had this problem for ages,, touchy and really responsive and zippy before it hits 1/4 on the temp gauge,, after it hits or goes over I have little throttle response and feels like I have massive lag but still boosts to 5psi.. I've changed everything apart from coils and internal pump