Another 4.8 not starting.FIXED!!!

[upallnight]

Originally Posted by four.8is

A bit longer of a post but please bear with me..

As I see it's a pretty common occurrence with these cars, I'm not surprised it hit me too.I just need to figure out what's causing it .im planning to have my Indy take a look at it tomorrow since it started behaving like this a few hrs ago and don't have software handy to diagnose it myself. I would just like some input before taking it in tomorrow evening.


It started like this..fired it up after a 2hr church service, it started just fine but died on me while I was backing out...I'm like what was that?

started it again, all was good ...drove to a restaurant, parked there for roughly 40min and when I returned to the car, it would not start just click 3-4 times then nothing...
it started after the 5th attempt..I immediately got a CEL ...drove it home, parked it,turned it off, tried to start it again and it would not start..

Went inside and came back after 20 min: unlocked OBC Test 9:

Car off:11.9V
After a few more tries the car started : 13.8V

CEL turned off by itself.
Drove around, still getting a solid 13.8V

Turned off the car after driving around for 10 min and now I'm getting 12.5-12.6V ....so different than the first time I let it sit for 20 min and I got 11.9V..

Stopped at gas station, turned off, same story, just cranking but not starting.after the 10th attempt it started again and CEL light is on again along with TRANSMISSION FAILSAFE PROGRAM.

parked it for the night, will fire it up tmw , read the codes and go from there.im just curious what causes this..

Spark plugs changed 2000 miles ago.
I ruled the alternator out.
Checked all battery connections all good.
Battery was changed 3 months ago..
Could be the Ignition switch ?
Coil packs?
Fuel pump going out?
Any fuses to look out for?
I'm lost...

The problem would be much simpler if it would just die and stay that way but it's starting after a few tries...any input is appreciated !

Maybe I should mention a few weird things I noticed...PDC sensors don't work sometimes now , only after a restart they come back to normal.

While cranking , oil temp gauge and temp gauge go all the way up to the max .is that normal?as soon as it started they went back to normal.

I don't hear the secondary air pump/fuel pump engaging when key in position 2.

Let me know what you guys think.thanks

Sounds like a fuel pump on it way out. If it cranks but doesn't start it probably the fuel pump. Easiest way to verify this is to connect a fuel pressure gauge to the fuel rail and see what you kind of pressure you have with the just the key in the run position and if you can start it, what type of fuel pressure you have with the engine running. Don't be surprise if you have good pressure with the engine running, since the brushes for the fuel pump could be making good contact once the pump is running, but you may have a dead spot when the pump has stopped and that is why you can't restart the engine.

Had this problem when I had an E34. Sometime the pump would work, other time it would leave me stranded. Changed the pump and never had any more no start problems afterward.