HPFP Replaced still long crank

ATLIEN · 04-12-2016, 12:49 PM

My HPFP was replaced a few weeks ago and the long and rough cranking occur intermittently. Dealer was like injectors are the next thing to focus on and noted that i had injectors #4 and #6 replaced prior to me owning the car. However, they would recommend me replacing all 6 just to be safe at a cost of $2k. I am no stranger to turning a wrench but was wondering the best method to finding out which injector(s) are problematic.

BQTuning · 04-12-2016, 01:04 PM

on an empty tank reset fuel adaptations and then throw this in while at the station BEFORE fill up

On your next empty tank throw this is in BEFORE fill up

zero2sixtyZ · 04-12-2016, 01:45 PM

Battery healthy?

ATLIEN · 04-12-2016, 03:32 PM

Quote:

Originally Posted by zero2sixtyZ

Battery healthy?

The battery is pretty good. I have a charger and will hook it up and see if any better.

ATLIEN · 04-12-2016, 03:34 PM

Quote:

Originally Posted by BuraQ

on an empty tank reset fuel adaptations and then throw this in while at the station BEFORE fill up

On your next empty tank throw this is in BEFORE fill up

Will give this a try.

BKBMW335I · 04-12-2016, 04:57 PM

plugs???

Coils???

GoRomeo · 04-12-2016, 04:58 PM

Also check for leaky injectors...

ATLIEN · 04-13-2016, 09:26 AM

Quote:

Originally Posted by BKBMW335I

plugs???

Coils???

I replaced plugs 3 months ago and have two new coils sitting around too. I am going to pull things apart this weekend and see wzup.

1fastt2 · 04-13-2016, 11:22 AM

Are there any codes being throw? FWIW I had a similar issue. It turned out to be a Fuel Tank Vent Valve. The valve was stuck open causing a large vacuum leak on start up. Its fairly easy to check right under the air intake box attached to the throttle body.

Antetokounmpo · 04-13-2016, 12:40 PM

My money is on leaky injectors, speaking from personal experience.

ATLIEN · 04-13-2016, 02:49 PM

Quote:

Originally Posted by 1fastt2

Are there any codes being throw? FWIW I had a similar issue. It turned out to be a Fuel Tank Vent Valve. The valve was stuck open causing a large vacuum leak on start up. Its fairly easy to check right under the air intake box attached to the throttle body.

No codes and the car runs like a champ.

ATLIEN · 04-13-2016, 02:50 PM

Quote:

Originally Posted by Heel Toe

My money is on leaky injectors, speaking from personal experience.

Gotcha.

04-12-2016, 12:49 PM	#1
ATLIEN Captain 549 Rep 791 Posts Drives: 08 335i & 11 M3 ZCP Join Date: Jun 2013 Location: Greenville, SC iTrader: (0)	HPFP Replaced still long crank My HPFP was replaced a few weeks ago and the long and rough cranking occur intermittently. Dealer was like injectors are the next thing to focus on and noted that i had injectors #4 and #6 replaced prior to me owning the car. However, they would recommend me replacing all 6 just to be safe at a cost of $2k. I am no stranger to turning a wrench but was wondering the best method to finding out which injector(s) are problematic.
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04-12-2016, 01:04 PM	#2
BQTuning Banned 469 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	on an empty tank reset fuel adaptations and then throw this in while at the station BEFORE fill up On your next empty tank throw this is in BEFORE fill up
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04-12-2016, 01:45 PM	#3
zero2sixtyZ Colonel 953 Rep 2,675 Posts Drives: e92 + f15 Join Date: Jan 2012 Location: Cambridge, MA iTrader: (4) Garage List 2007 335i Coupe [9.50] 2015 X5 xdrive50i [10.00]	Battery healthy?
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04-12-2016, 04:57 PM	#6
BKBMW335I Captain 157 Rep 772 Posts Drives: '11 E93 335I Join Date: Aug 2015 Location: Land of OZ, Kansas iTrader: (0)	plugs??? Coils??? __________________ Mods: MHD Stg 2, xHP Flashtool Stage 3, VRSF 3" Chargepipe, Megan 4" Downpipes, Pure N55 Inlet, Outlet, VSRF 5" Stepped Intercooler, GFB Diverter, BMS N55 Intake, Michelin Pilot Super Sport Tires, BMS Sport Oil Cooler Valve, CF Spoiler, CF Kidney Grille, CF Mirror Covers, CF Eyelids, CF Wheel Hub Covers, CF Diffuser, M Sport Racing Strip, 20% Tints, and Golf Tee Mod
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04-12-2016, 04:58 PM	#7
GoRomeo Brigadier General 976 Rep 3,870 Posts Drives: 330i, 135i Join Date: Feb 2006 Location: San Diego CA iTrader: (0) Garage List 2008 BMW 135i [9.50] 2006 330i [6.75]	Also check for leaky injectors...
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04-13-2016, 11:22 AM	#9
1fastt2 Private First Class 99 Rep 178 Posts Drives: 335i Join Date: Mar 2014 Location: Reading Pa iTrader: (0)	Are there any codes being throw? FWIW I had a similar issue. It turned out to be a Fuel Tank Vent Valve. The valve was stuck open causing a large vacuum leak on start up. Its fairly easy to check right under the air intake box attached to the throttle body. __________________ 2008 e92 335i 6MT - Fully Built Motiv Closed Deck Conversion. Everything else that goes with it.
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04-13-2016, 12:40 PM	#10
Antetokounmpo Brigadier General 1552 Rep 3,475 Posts Drives: E90 6MT FBO; '18 F150 Platinum Join Date: Jul 2013 Location: WI iTrader: (3) Garage List 2018 Ford F-150 Pla ... [0.00] 2008 BMW 335xi [0.00]	My money is on leaky injectors, speaking from personal experience. __________________ 2008 335xi 6MT \| VRSF Catless DP \| VRSF 7" FMIC \| VRSF CP \| TIAL BOV \| DCI \| MHD 2+ BC Racing BR \| Stoptech 600 \| Firehawk Indy 500 255 Square \| Atric Altimax 225 Sq. 2018 F-150 Platinum 701A \| FX4 \| 3.5 EcoBeast
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