My car has very abnormal starts...

miringrains · 07-11-2013, 12:57 PM

Sometimes it would literally start as soon as I would push the button, sometimes it would delay a few cranks and then fire up (with a bit of ruffness). Today was very strange, it cranked for the longest time, and finally started after maybe 5-6 cranks... What can be the problem?

JStang · 07-11-2013, 01:32 PM

Quote:

Originally Posted by miringrains

Sometimes it would literally start as soon as I would push the button, sometimes it would delay a few cranks and then fire up (with a bit of ruffness). Today was very strange, it cranked for the longest time, and finally started after maybe 5-6 cranks... What can be the problem?

Do you run E85 at all?

Red_Bean_Bun · 07-11-2013, 01:40 PM

Signs of starter motor issues ?

JStang · 07-11-2013, 01:45 PM

Injectors are a good place to look.

GoRomeo · 07-11-2013, 01:49 PM

Sounds to me more like fuel pump issue...keep us posted.

enrita · 07-11-2013, 01:53 PM

leaky injector: happens almost only when car is left overnight and cold start. can smoke, missfire and smell gas .
hpfp: happens on a regular basis, cold/hot start . gets worse and worse till it dies and you cannot run the car anymore

miringrains · 07-11-2013, 03:28 PM

Hmm... I'll have to look into causes. Because HPFP is free under warranty, but I can't imagine them replacing it until its totally finished..

Tiago@VRSF · 07-11-2013, 03:40 PM

Long cranks are a pretty good indicator of a failing fuel system. I'd start with the HPFP and LPFP and then injectors.

roadkillrob · 07-11-2013, 03:56 PM

I had one fuel pump that just had long starts, usually after it sat, started out once in a while, then almost every morning, then even after it sat for a couple hours it would get long starts. BMW tried to fix this in newer software by pre priming when you open the car door, so the issue is less apparent and happens less often, but eventually you get some long starts as it gets worse. Otherwise the car always ran like a top and never threw any CEL's. The next pump never had long starts with the updated software but started throwing CEL's when using a lot of throttle, so they can fail differently, but it does sound like a fuel pump issue in yours potentially. If it was injectors or plugs, it would start fine but miss or run rough, if it is a long start, the engine is not getting fuel in any cylinder for a period of time.

E90Company · 07-11-2013, 04:45 PM

Quote:

Originally Posted by enrita

leaky injector: happens almost only when car is left overnight and cold start. can smoke, missfire and smell gas .
hpfp: happens on a regular basis, cold/hot start . gets worse and worse till it dies and you cannot run the car anymore

+1.

07-11-2013, 12:57 PM	#1
miringrains Banned 72 Rep 702 Posts Drives: '11.5 M3 E93 Join Date: Mar 2013 Location: New York iTrader: (2)	My car has very abnormal starts... Sometimes it would literally start as soon as I would push the button, sometimes it would delay a few cranks and then fire up (with a bit of ruffness). Today was very strange, it cranked for the longest time, and finally started after maybe 5-6 cranks... What can be the problem?
	Appreciate 0 Tweet Quote

07-11-2013, 01:40 PM	#3
Red_Bean_Bun Captain 62 Rep 944 Posts Drives: E92 Join Date: Nov 2009 Location: Montreal iTrader: (4)	Signs of starter motor issues ?
	Appreciate 0 Quote

07-11-2013, 01:45 PM	#4
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	Injectors are a good place to look.
	Appreciate 0 Quote

07-11-2013, 01:49 PM	#5
GoRomeo Brigadier General 964 Rep 3,854 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]	Sounds to me more like fuel pump issue...keep us posted.
	Appreciate 0 Quote

07-11-2013, 01:53 PM	#6
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	leaky injector: happens almost only when car is left overnight and cold start. can smoke, missfire and smell gas . hpfp: happens on a regular basis, cold/hot start . gets worse and worse till it dies and you cannot run the car anymore __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
	Appreciate 0 Quote

07-11-2013, 03:28 PM	#7
miringrains Banned 72 Rep 702 Posts Drives: '11.5 M3 E93 Join Date: Mar 2013 Location: New York iTrader: (2)	Hmm... I'll have to look into causes. Because HPFP is free under warranty, but I can't imagine them replacing it until its totally finished..
	Appreciate 0 Quote

07-11-2013, 03:40 PM	#8
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Long cranks are a pretty good indicator of a failing fuel system. I'd start with the HPFP and LPFP and then injectors.
	Appreciate 0 Quote

07-11-2013, 03:56 PM	#9
roadkillrob Major General 863 Rep 5,448 Posts Drives: 08 335i,22 X3M, 2012 C63 Black Join Date: Jul 2007 Location: Boston iTrader: (15)	I had one fuel pump that just had long starts, usually after it sat, started out once in a while, then almost every morning, then even after it sat for a couple hours it would get long starts. BMW tried to fix this in newer software by pre priming when you open the car door, so the issue is less apparent and happens less often, but eventually you get some long starts as it gets worse. Otherwise the car always ran like a top and never threw any CEL's. The next pump never had long starts with the updated software but started throwing CEL's when using a lot of throttle, so they can fail differently, but it does sound like a fuel pump issue in yours potentially. If it was injectors or plugs, it would start fine but miss or run rough, if it is a long start, the engine is not getting fuel in any cylinder for a period of time. __________________ 2022 X3M Brooklyn Grey 2008 E93 335i FBO 2012 Mercedes C63 Black Series Alanite Grey
	Appreciate 0 Quote