Hessitating when not running fuel cleaner

teamshock nick · 06-23-2017, 05:09 AM

Hi

E92 335i

Noticed my car has been hesitating. Seems to do it when at a constant throttle speed, or higher in the rev range.

It's got worse.

Last week had my plugs changed and the garage mentioned that the car sounded like it had a fueling issue.

They put fuel cleaner in it. The cleaner seemed to cleared up the issue but now that I have done a tank of fuel, the issue as back.

Would that point to injectors being the issue being that fuel cleaner worked?

Im going to try another bottle of cleaner today.

Len_Beach · 06-23-2017, 05:45 AM

Fuel filter?

AWSAWS · 06-27-2017, 05:29 AM

Do you run 'premium unleaded'? Those fuels contain more detergents apparently and should be better in the long term as well as providing more octane. Your car may need the higher octane to be happy as well.

I'd suggest the VPower Nitro although I use mainly Momentum99 myself.

Phil325i · 06-27-2017, 11:19 AM

Could be one of many possible causes (injectors, fuel pump(s), Vanos solenoids, coils etc etc). Get your car's fault codes read, otherwise you'll just be guessing and spending out on unnecessary parts...

oli3 · 06-28-2017, 09:40 AM

Definitely worth running several tanks of premium fuel like Momentum 99 or Vpower to see if there's an improvement.

teamshock nick · 07-13-2017, 08:53 AM

It was a cracked valve cover and a faulty injector.

oli3 · 07-13-2017, 09:11 AM

Quote:

Originally Posted by teamshock nick

It was a cracked valve cover and a faulty injector.

Do you know if you had any error codes?

teamshock nick · 07-13-2017, 10:30 AM

Yes, don't know what they were though.

Engine management light was on constantly.

Very expensive repair.

oli3 · 07-13-2017, 11:41 AM

Quote:

Originally Posted by teamshock nick

Yes, don't know what they were though.

Engine management light was on constantly.

Very expensive repair.

Ye if EML was on then it would have had codes

06-23-2017, 05:09 AM	#1
teamshock nick Private First Class 44 Rep 110 Posts Drives: 335d Join Date: Apr 2016 Location: Reading iTrader: (0)	Hessitating when not running fuel cleaner Hi E92 335i Noticed my car has been hesitating. Seems to do it when at a constant throttle speed, or higher in the rev range. It's got worse. Last week had my plugs changed and the garage mentioned that the car sounded like it had a fueling issue. They put fuel cleaner in it. The cleaner seemed to cleared up the issue but now that I have done a tank of fuel, the issue as back. Would that point to injectors being the issue being that fuel cleaner worked? Im going to try another bottle of cleaner today.
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06-23-2017, 05:45 AM	#2
Len_Beach Major 191 Rep 1,245 Posts Drives: 435d Join Date: Jun 2011 Location: UK iTrader: (1)	Fuel filter?
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06-27-2017, 05:29 AM	#3
AWSAWS Colonel 277 Rep 2,340 Posts Drives: E92 GC Turbos, FBO, 335i DCT Join Date: Nov 2012 Location: Valhalla iTrader: (0)	Do you run 'premium unleaded'? Those fuels contain more detergents apparently and should be better in the long term as well as providing more octane. Your car may need the higher octane to be happy as well. I'd suggest the VPower Nitro although I use mainly Momentum99 myself. __________________ GC Turbos, FBO, JB4, DCT, Port Meth injection, BMS Charge Pipe, NGK plugs. EBC brakes and pads, LED Angel lights, LED foglights, LCI rears OCC, Braided brake lines. Custom Diff Lockdown Kit, VTT inlets, TMAP, stage 2+ fuel pump 11.79@119mph (stock turbos) 11.74@129mph (GC Turbos)
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06-27-2017, 11:19 AM	#4
Phil325i Brigadier General 639 Rep 3,212 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Could be one of many possible causes (injectors, fuel pump(s), Vanos solenoids, coils etc etc). Get your car's fault codes read, otherwise you'll just be guessing and spending out on unnecessary parts... __________________ 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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06-28-2017, 09:40 AM	#5
oli3 Private First Class 42 Rep 188 Posts Drives: BMW Join Date: Sep 2016 Location: Helsinki iTrader: (1)	Definitely worth running several tanks of premium fuel like Momentum 99 or Vpower to see if there's an improvement.
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07-13-2017, 08:53 AM	#6
teamshock nick Private First Class 44 Rep 110 Posts Drives: 335d Join Date: Apr 2016 Location: Reading iTrader: (0)	It was a cracked valve cover and a faulty injector.
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07-13-2017, 10:30 AM	#8
teamshock nick Private First Class 44 Rep 110 Posts Drives: 335d Join Date: Apr 2016 Location: Reading iTrader: (0)	Yes, don't know what they were though. Engine management light was on constantly. Very expensive repair.
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