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-   -   Car slow to start? (https://www.ft86club.com/forums/showthread.php?t=45177)

ericmpena 08-25-2013 04:22 PM
Car slow to start?
 
I have less than 5k miles and had only had my car since June. Today when I tried to start it up the engine just stayed cranking for about 5 seconds and then it finally started. This is the first time it's happened. I've already had my first oil change at 3250 miles.

Should this be happening so soon? I'm thinking about taking it to the dealership just to be safe. Has anyone else had this happen so early on?

xjohnx 08-25-2013 06:17 PM
Quote:
Originally Posted by ericmpena (Post 1165727)
I have less than 5k miles and had only had my car since June. Today when I tried to start it up the engine just stayed cranking for about 5 seconds and then it finally started. This is the first time it's happened. I've already had my first oil change at 3250 miles.

Should this be happening so soon? I'm thinking about taking it to the dealership just to be safe. Has anyone else had this happen so early on?
It happened to me once or twice when stock (out of hundreds of starts). Both times it happened the engine was cold parked on an incline (nose pointed down). Never really pursued it since it was so intermittent and not repeatable.

Wo6M 08-25-2013 08:58 PM
You could bring it in and have your battery load tested. If it fails it would be replaced under warranty. Although what they dont tell you is the replacement batter is NOT under warranty and next batter change will be out of pocket but that battery WILL be covered .
LOL crazy huh...

BRZnut 08-25-2013 09:40 PM
I have had the car since Nov and it has happened to me twice but both times it was a warm re-start. (parked for 15 min)

pheoxs 08-26-2013 12:57 AM
This happened to me 3 times over the winter. It only seems to do it if I turn the key all the way in one motion. If I turn the ignition on, let the tac sweep then start, it's never done it. Maybe the fuel pump isn't priming the direct infection pump? No idea

Sent from my Nexus 4 using Tapatalk 4

Porsche 08-26-2013 02:51 AM
Port injection fuel pressure may be around 40-60 psi, while the direct injection fuel pressure may be 2000-3000 psi, quite a bit higher. The high pressure fuel pump takes a little while to build that much pressure in the system – it needs time.

When I get into my BRZ, I first turn all the electronics to ON (I press my START button twice), then adjust my seat and put on my seatbelt. By then my fuel pump has had time to build the required pressure. The engine starts immediately, now.

finch1750 08-26-2013 05:16 AM
Quote:
Originally Posted by Porsche (Post 1166688)
Port injection fuel pressure may be around 40-60 psi, while the direct injection fuel pressure may be 2000-3000 psi, quite a bit higher. The high pressure fuel pump takes a little while to build that much pressure in the system – it needs time.

When I get into my BRZ, I first turn all the electronics to ON (I press my START button twice), then adjust my seat and put on my seatbelt. By then my fuel pump has had time to build the required pressure. The engine starts immediately, now.
This. I had the same problem, and now turning it to "ON" for a few seconds and have not had an issue since.

FRSBRZGT86FAN 08-26-2013 07:47 PM
Quote:
Originally Posted by Porsche (Post 1166688)
Port injection fuel pressure may be around 40-60 psi, while the direct injection fuel pressure may be 2000-3000 psi, quite a bit higher. The high pressure fuel pump takes a little while to build that much pressure in the system – it needs time.

When I get into my BRZ, I first turn all the electronics to ON (I press my START button twice), then adjust my seat and put on my seatbelt. By then my fuel pump has had time to build the required pressure. The engine starts immediately, now.
Wait, doesn't the HPFP require the engine to be running to work? I though it ran off the camshaft or something? Or maybe its not required on start ups so the electronic fuel pump does all the heavy lifting?

mav1178 08-26-2013 08:44 PM
[ame="http://en.wikipedia.org/wiki/Common_rail"]Common rail - Wikipedia, the free encyclopedia[/ame]

Keep in mind there's two pumps on our car.

-alex

FRSBRZGT86FAN 08-28-2013 01:00 AM
Quote:
Originally Posted by mav1178 (Post 1168747)
Common rail - Wikipedia, the free encyclopedia

Keep in mind there's two pumps on our car.

-alex
:lol: I am aware of that but he mentioned High pressure lines and what not

andrew20195 08-28-2013 03:29 PM
Quote:
Originally Posted by Porsche
Port injection fuel pressure may be around 40-60 psi, while the direct injection fuel pressure may be 2000-3000 psi, quite a bit higher. The high pressure fuel pump takes a little while to build that much pressure in the system – it needs time.

When I get into my BRZ, I first turn all the electronics to ON (I press my START button twice), then adjust my seat and put on my seatbelt. By then my fuel pump has had time to build the required pressure. The engine starts immediately, now.
The engine starts using port injection only, as the high pressure fuel pump is mechanical. It switches to dual mode after a few seconds.

If you have a long crank time, it may be related to the cam sensor signal issue, for which there is a Subaru TSB.


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