2016 340i cranks for a very long time on cold start

realpedro · 03-18-2024, 04:05 PM

Hello guys! im posting today to try and find an answer to my troubles..

My 2016 340i is having very long cranking before starting somtimes even having todo the cycle of starting twice. The car is modified with a HPFP and full e85 and has been retuned 2 times since the issue has occured. After the car starts the fuel rail pressure its normal and if i turn the car off and on again it start rights up. also the outside temp is 50 degrees F. and the HPFI isnt even a year old.

realpedro · 03-19-2024, 10:15 AM

sadness!! PLEASE HELP ME

ashkanvafaee2 · 03-19-2024, 02:29 PM

Can't provide much help, but when my '07 530i was leaking fuel from the fuel hose connection, it also resulted in very long cranks until I replaced the hose.

So it could definitely be fueling related.

co_440i · 03-19-2024, 02:47 PM

How's your starter, how are your spark plugs and ignition coils

E36M3 · 03-23-2024, 01:13 PM

You have something bleeding off your fuel pressure. I had similar symptoms on a N55 powered X3 and it turned out to be a leaking injector. No codes, normal power. Found it by pulling plugs and inspecting each cylinder and plugs for signs of wet fueling. It was blantanly obvious when I got to cylinder 4 as the plug was soaked. Change it and calibrated the new injector offset with ISTA and all is well. Suggest checking why you are losing pressure.

thejeremyman9 · 03-24-2024, 07:48 PM

How cold is your cold start...? Full E85 has difficult cold starts.

intl440 · 03-26-2024, 03:21 PM

Could also be the fuel tank purge valve. No CEL on with the long crank could be a sign it is going to fail soon.

samspiderman3125 · 03-27-2024, 07:42 AM

Quote:

Originally Posted by realpedro

Hello guys! im posting today to try and find an answer to my troubles..

My 2016 340i is having very long cranking before starting somtimes even having todo the cycle of starting twice. The car is modified with a HPFP and full e85 and has been retuned 2 times since the issue has occured. After the car starts the fuel rail pressure its normal and if i turn the car off and on again it start rights up. also the outside temp is 50 degrees F. and the HPFI isnt even a year old.

its your e85, not much to worry about

03-18-2024, 04:05 PM	#1
realpedro Registered 0 Rep 3 Posts Drives: bmw 340xi Join Date: Sep 2023 Location: 10536 iTrader: (0)	2016 340i cranks for a very long time on cold start Hello guys! im posting today to try and find an answer to my troubles.. My 2016 340i is having very long cranking before starting somtimes even having todo the cycle of starting twice. The car is modified with a HPFP and full e85 and has been retuned 2 times since the issue has occured. After the car starts the fuel rail pressure its normal and if i turn the car off and on again it start rights up. also the outside temp is 50 degrees F. and the HPFI isnt even a year old.
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03-19-2024, 10:15 AM	#2
realpedro Registered 0 Rep 3 Posts Drives: bmw 340xi Join Date: Sep 2023 Location: 10536 iTrader: (0)	sadness!! PLEASE HELP ME
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03-19-2024, 02:29 PM	#3
ashkanvafaee2 Private First Class 39 Rep 103 Posts Drives: 2016 340i Join Date: Feb 2020 Location: Austin, TX iTrader: (0)	Can't provide much help, but when my '07 530i was leaking fuel from the fuel hose connection, it also resulted in very long cranks until I replaced the hose. So it could definitely be fueling related.
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03-19-2024, 02:47 PM	#4
co_440i Private First Class 108 Rep 103 Posts Drives: 440i Join Date: May 2023 Location: Colorado iTrader: (0)	How's your starter, how are your spark plugs and ignition coils
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03-23-2024, 01:13 PM	#5
E36M3 Private 53 Rep 77 Posts Drives: 97 M3, '14 335i, '12 X3 35i Join Date: Jan 2018 Location: Here iTrader: (0)	You have something bleeding off your fuel pressure. I had similar symptoms on a N55 powered X3 and it turned out to be a leaking injector. No codes, normal power. Found it by pulling plugs and inspecting each cylinder and plugs for signs of wet fueling. It was blantanly obvious when I got to cylinder 4 as the plug was soaked. Change it and calibrated the new injector offset with ISTA and all is well. Suggest checking why you are losing pressure.
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03-24-2024, 07:48 PM	#6
thejeremyman9 Major General 4364 Rep 7,606 Posts Drives: 2015 BMW 335i Join Date: May 2019 Location: Cali iTrader: (0)	How cold is your cold start...? Full E85 has difficult cold starts.
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03-26-2024, 03:21 PM	#7
intl440 New Member 15 Rep 24 Posts Drives: 2018 BMW 440i M Sport Join Date: Jun 2023 Location: Los Angeles, CA iTrader: (0)	Could also be the fuel tank purge valve. No CEL on with the long crank could be a sign it is going to fail soon.
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