Maroc - SAU.COM.AU - content - 21/Oct 10:42

R34 engine losing power suddenly under load

Evening guys, I am having an issue with my R34 GT-T - When the engine is under any load it stumbles and cuts out momentarily, it feels like the TCS kicking in it is so sudden. The issue gets worse when the engine is hot and sometimes the car will just stall and not be able to idle, after this happens I crank it over but it wont start. When it has cooled for about 30 minutes it eventually starts and runs a lot better. So far I have: Filled up with fresh 98, checked mesh filter inside tank, replaced engine fuel filter. Thrown on a spare set of coil packs & harness which didn't help. I also checked the plugs and even though there was corrosion on cyl 2, they were not fouled. Tested for boost leaks/cracked vacuum hose. I found some small leaks just before the TB and replaced silicon hose. I wasn't able to hold pressure but my set up wasn't great so worth another look, but wouldn't explain the issue. Purchased an ECU talk cable and checked for codes. I couldn't find a reading for the ECU monitoring boost pressure, however I could see O2 and timing monitors were running well until the engine heated up then timing would drop from 15 to 5 degrees at idle and then 0 degrees, until i revved the engine it would jump up to 20 or so, but shoot back down to 0 as soon as I lifted off. The volts for the O2 would also follow the pattern of engine speed until it warmed up, then they stayed at 0 until i revved the car then they spike up when the revs dropped back down. Previously I had trouble with the hot start, I took it back to the tuners and they adjusted the fuel map and it seemed to fix the problem. Prior to this incident I had the car sitting in the garage for about 5 months, I started and idled it every other week. About 2000km ago I had a Nistune, Hi flow turbo, 1000cc injectors, Z32 & new fuel pump installed and the car was running sweet up until now. Let me know if you have any more ideas, I am about ready to tow it back to the tuners but wouldn't mind having a few more cracks at trying to fix it. Cheers IMG_5454.MOV IMG_5450.MOV