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Maximum09

By Maximum09,
in Engines & Forced Induction

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Maximum09 Apprentice

Maximum09

Posted
Posted

I NEED HELP!!

I have a 1990 R32 GTS-T and something is wrong with it and I cant work it out...

I've only had the car for about a month now and it was running beautifully when I first got it but then all of a sudden a problem has developed with the boost...when I first got it boost would come on at about 4000rpm on full throttle, but now when it hits approx 10psi the car splutters violently and just bunny hops and does nothing but if I keep my foot down long enough then the boost finally kicks in. (For some reason everything works the way its meant to in first gear, sometimes...) Also if I just drive normally not making boost the car drives fine. and it is using an insane amount off fuel as i'm only getting about 200kms to a tank and it puffs black smoke out the exhaust when I try and hit boost.

Ever since this started happening I replaced several parts trying to fix it including;

- BOV

- FPR

- Coil packs

I was thinking of replacing the Wastegate next..

I've inspected all hoses and lines and they all seem fine, also inspected the spark plugs and are all good.

I'm stumped to what might be causing this problem...any ideas?? ermm.gif

P.S. The car has a Hypergear ATR43 turbo and is tuned to 15psi

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boostn0199 Grand Master

boostn0199

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Try lowering your spark plug gap if it already isnt , should be running bcpr7es at 0.8, also did this probelm start out of nowhere or wasnt when turbo got put on at and boosted to 15psi dont know if r32 ecus are like r33 stock ones and hit r and r when boosting over 10-11 and if all this isnt the problem maybe check your coil pack harness and regards to fuel if it isnt tuned with a ecu or if it is tuned then its a poor tune to be getting economy like that.

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Maximum09 Apprentice

Maximum09

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Try lowering your spark plug gap if it already isnt , should be running bcpr7es at 0.8, also did this probelm start out of nowhere or wasnt when turbo got put on at and boosted to 15psi dont know if r32 ecus are like r33 stock ones and hit r and r when boosting over 10-11 and if all this isnt the problem maybe check your coil pack harness and regards to fuel if it isnt tuned with a ecu or if it is tuned then its a poor tune to be getting economy like that.

We checked the gap when we inspected the plugs, its at that...and technically speaking it only started once I took it to an aircon place to get a hose replaced for the aircon, then once i got it back it started doing this. I took it back to them complained and asked what they took off to do the job and check them in particular and it all seemed fine...the harness as brand new, no cracks or splits...and i have a nistune ecu installed, i was getting close to 600kms to a tanks when i first got it and no there are no leaks, i have replaced the fuel filter and am running a Bosch 040 fuel pump

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Maximum09 Apprentice

Maximum09

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Check the voltage on the AFM when you are boosting. If it exceeds 4.9V you may be hitting factory boost cut

...edit.... and when I say boost cut I mean ignition cut relative to boost/air flow etc

I will check that when I get a chance next

As well this car was in with you guys not too long before I purchased it, and reading through the receipts it had some kind of misfiring issue. Is it possible this issue could have arisen again?

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Trozzle Grand Master

Trozzle

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Posted

If it's idling high, check for vacuum leaks after the throttle body, INCLUSIVE OF THE AAC/IAC. It might be faulty/thrown out. Only way idle can go up is for there to be more air getting in, so if the throttle plate is still closing then you have a leak somewhere behind that.

EDIT: could also potentially explain the lag with boost and then R&R - if boost is leaking out of the manifold after the throttle body, then for the manifold pressure to get to 10psi there would be MUCH more airflow through the AFM to overcome the leak.

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