[cspinnnn]

Hey Everyone,

I need help Trying to diagnose a problem with my N20.

I've been having an issue where my cars revs would drop sporadically during cold starts. For example, I would start my car in the morning for work, wait till it revs down to about 700RPMs put it in drive & pull out from my driveway.

What I've noticed is that during the first 5-10mins of it being driven if I were to come to a completely stop at a stop sign or light my revs would drop from about 7-800 all the way down to 400 & my car would vibrate kinda feeling like it wants to stall but catches itself at the last minute.

For maintenance on this car I've done spark plugs, ignition coils, injectors, HPFP, fuel rail pressure sensor, vanos actuators, external ambient temp sensor, thermostat, MAF & new battery.

The car currently has a VRSF chargepipe, injen air intake & BM3 stage1.

When scanning it I get no codes but I do get 2 warnings, "21A416- High fuel pressure when injection is released: pressure too low" & "480AB5- Transfer case long-term protection function requested from LMV"

If anyone has any ideas of what this could be please let me know

[Slick_FThirty]

I had engine stall issues, similar to what you mentioned. After a cold start, the revs would fluctuate a lot and either go very low or the engine would actually stop. During this time, the engine felt quite rough. Changed the engine air filter and never had the issue afterwards.

[LaNcE01]

I had the same issue not long ago, Engine trying to stall on me during idle. Because your running a tune, Id suggest check the gaps between the spark plugs.

[Bdragon]

I just replaced my downstream O2 sensor for the rough idle. It fixed it