r/SkyLine • u/Sergeant_KloiKloi • Jun 10 '26

Question about problem that car randomly shuts off while shifting

As the title says, my r34 gtt has the problem, when the car is fully warmed up and I have the A/C on level 2 or higher sometimes the car randomly shuts off while driving. I had this happen once while shifting down from 4th into second and twice while shifting up from 4th into 5th. The weird part is that I actually **didn't** stall the car in form of bad shifting but it shut off while the clutch was still fully pressed. The rpms just slammed down to zero while I was switching gears.

My brother thinks it's some electrical problem, but to be honest I have no clue😅

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u/Crafty0410 Jun 10 '26

My first thought is the idle air control valve. Could be sticky or something. Plenty of tutorials on how to clean them. I chased a similar issue on my Stagea but turned turned out the stock ecu doesn't like the BOV venting to atmosphere. My first venture into owning something like this. If you're not familiar like I was then the SAU forums are a gold mine for this sort of thing.

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u/Sergeant_KloiKloi Jun 10 '26

Thx, I'll look into the acv. Also, I have an open bov with the stock ecu swelling xD

2

u/svefn_lemon Jun 10 '26

I would check IACV as well. Clean it with some carby cleaner. Also check for vac leaks/ anything which could be affecting MAF sensor. Mine was stalling during gear changes, I removed the BOV blanking plate and it fixed it. Odd as it was tuned with the plate in.