Crank No start (Not battery issue) NEED HELP

[humfrz]

Originally Posted by Tcoat

Car won't start.

I was just going by what the OP posted yesterday ....... which indicated he had checked the voltage the alternator was putting out.

"Hi Tcoat, Yes Engine is fully stock no mod

Just check the Alternator still good and charging battery 11.6v
Battery measure at 12.6v
Compression on all Cylinder is within spec at 135 PSI

Check all the relay and Fuses non blown or damage"





humfrz

[guybo]

11.6 is low voltage for an altenator but not low enough that the car would stall. You'd get the check charging system light. But that is only voltage, do you have open phase or bad diodes? How's the ripple?

What is the fuel pressure? the fuel pump working only tells you if the in-tank fuel pump is working, but what about the HPFP? What's the pressure? Insufficient pressure from a working fuel pump will cause the car to stall out.

[cnxmist]

@ Guybo Thank for the lead, I'll get those check out

[Tcoat]

Originally Posted by cnxmist

HELP!!! my car (2013 Subaru BRZ Limited Auto) was running the other day, and suddenly stall out on me on the freeway, now it crank over but doesn't start, the only code that was stored prior to the incident is P0031 and P0560. Any info lead to fixing would be appreciated

- replaced the O2 Sensor
- Check Battery and replaced

Car was running on Fwy then lost power = stall out didnt start after that

Originally Posted by cnxmist

Hi Tcoat, Yes Engine is fully stock no mod

Just check the Alternator still good and charging battery 11.6v
Battery measure at 12.6v
Compression on all Cylinder is within spec at 135 PSI

Check all the relay and Fuses non blown or damage

Originally Posted by guybo

11.6 is low voltage for an altenator but not low enough that the car would stall. You'd get the check charging system light. But that is only voltage, do you have open phase or bad diodes? How's the ripple?

What is the fuel pressure? the fuel pump working only tells you if the in-tank fuel pump is working, but what about the HPFP? What's the pressure? Insufficient pressure from a working fuel pump will cause the car to stall out.

Originally Posted by cnxmist

@ Guybo Thank for the lead, I'll get those check out

How exactly are you measuring 11.6 from the alternator if it won't start?

[Ultramaroon]

Originally Posted by Tcoat

How exactly are you measuring 11.6 from the alternator if it won't start?

I caught that too but let it go earlier - quick reading breaks.

So, for funzies I just disconnected the accessory belt and started it to prove it would run on battery alone. Didn't want to assume it would.

OP, does the starter crank over the engine like the battery has a full charge? If yes, it's not the alternator because the charging circuit and battery are fine.

[guybo]

Quote:
Originally Posted by Tcoat View Post
How exactly are you measuring 11.6 from the alternator if it won't start?

somebody mentioned something about removing the alternator from the car to test it so I figured that's what he did. I should hope he knew enough not to get a voltage when the engine was cranking over but not starting.

With the batt voltage being good, it wasn't the alternator that made the car stall. The car would run until the volatge got so low it could not provide spark then die. The low voltage CEL is a red herring. That CEL probably came up after the car died. We really need more info from that CEL on what the car was doing when the CEL came up- but you need a better scan tool than a bluetooth code reader for that.