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hi guys, im new on here so please be nice to me,
i purchased my skyline r32 gts4 over a year ago, and now it has developed a problem, when you drive the car it drives perfect and engages the 4wd as it should when it needs to, but after about 10 miles the car will start to judder/jerk when the the 4wd is engaged. i checked the attesa ecu and it flashes 18 times, i found a earth strap perished which came from the attesa pump to the chassis, i have replaced the earth strap but the car still judders/jerks in 4wd, after changing the earth strap the attesa ecu does not have any faults codes flashing, when i take the 4wd fuse out it will drive perfect without the 4wd, this is my 5th r32 and second gts4 and i have never had this problem before, can someone please help
 

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I have simillar problem with my R32 GTR. All grounds ar good, no fault codes, but car jerks when im driving it slowly or maintaining steady speed. Torque needle jumps around from 8 to 10 from 8 to 10 and so on. Once, but only once it jumped from 0 to 10 and back.
What could it be? I have used search in here and google, a lot of people have problem like this, but they have fault codes. I have no codes. Please help?
Transfer case on its way out or G sensor dead?
 

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I think i found problem what could causing this to me. After some deep research in forums i think its my Attesa accumulator. This is nitrogen filled bottle which sits together with attesa pump and helps to maintain pressure.

Turn on you 4wd system (fuse back on or switch, whatever you have), and let the car idle for a while. Open your trunk, put your head inside and stay like this for at least 5minutes. Try to hear clicking relay noise at the rear. If its clicking really often (like few times in a minute or 2 minutes). Then your nitrogen filled bottle is getting empty and attesa pump is engaging too often, because it have to maintain pressure.

Also a question does your 4wd funktion properly when you floor it?
 
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