Where to buy N53 / N54 injectors

Phil325i · 11-10-2022, 01:15 PM

Best way to isolate which cylinder(s) is to remove all plugs after an overnight stop. Any plugs that are black, wet and stink of petrol are the likely suspects.

e92_josh · 11-12-2022, 03:45 AM

I recently had to address severe injector leaks on my N53 (engine wouldn't run properly at all, even after sparks and coils).

I bought used off eBay and tested them on the fuel rails by connecting them externally and cranking the engine over.
I bought 6 from different sellers and managed to get 3 that passed this driveway pressure test.

The engine runs much better but I still have some minor leaking occurring. I'll probably pull plugs to find out which ones as Phil recommended.

The test I did was okay, but only checks the injectors at cold temps, not the operational temp of the injector when it's in the head.

I'm also in the position as soup, the car is at 145k miles now and even if I could buy new, £2k+ just seems a mental expense at this point.

Dormermike · 11-12-2022, 01:02 PM

Sadly I think a lot of n53 cars will be written off by the price of injectors. It's not going to get better either.

11-10-2022, 01:15 PM	#23
Phil325i Brigadier General 615 Rep 3,194 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Best way to isolate which cylinder(s) is to remove all plugs after an overnight stop. Any plugs that are black, wet and stink of petrol are the likely suspects. __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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11-12-2022, 03:45 AM	#24
e92_josh Enlisted Member 6 Rep 46 Posts Drives: e92 325i M Sport Join Date: Jan 2019 Location: UK iTrader: (0)	I recently had to address severe injector leaks on my N53 (engine wouldn't run properly at all, even after sparks and coils). I bought used off eBay and tested them on the fuel rails by connecting them externally and cranking the engine over. I bought 6 from different sellers and managed to get 3 that passed this driveway pressure test. The engine runs much better but I still have some minor leaking occurring. I'll probably pull plugs to find out which ones as Phil recommended. The test I did was okay, but only checks the injectors at cold temps, not the operational temp of the injector when it's in the head. I'm also in the position as soup, the car is at 145k miles now and even if I could buy new, £2k+ just seems a mental expense at this point.
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11-12-2022, 01:02 PM	#25
Dormermike Captain 102 Rep 681 Posts Drives: Bmw f10 Join Date: Dec 2015 Location: Uk iTrader: (0)	Sadly I think a lot of n53 cars will be written off by the price of injectors. It's not going to get better either.
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