I have a 3.4, which was rebuilt about 8000km ago with a new short block from Porsche, head work (valve seats, seals, etc), new chains, the works. The power cable to the starter and the engine ground strap were also changed and the car worked fine until a few weeks ago I started experiencing really hard hot starts. The engine will barely crank over at first, but once it gets going it's OK and starts. This is if I stop for maybe 15 minutes and come to re-start the car.
The dash will show 14 - 14,2V when cold, but as the engine warms up it drops to ~13,5V. The engine will also crank, although maybe a bit sluggish, and start fine when cold.
Charging current at idle is only 13,4V at the battery and 13,6V at the engine auxiliary power connector. Battery voltage right after driving is 12,1V, which to me means the battery is only about 30% charged
What do you guys think? To me this sounds like a bad alternator and/or battery.
I also see there are 120A and 150A alternators for these cars. Can I just order the more powerful one? I don't see any other differences. My car is a manual so I know will need the clutch pulley version.
The dash will show 14 - 14,2V when cold, but as the engine warms up it drops to ~13,5V. The engine will also crank, although maybe a bit sluggish, and start fine when cold.
Charging current at idle is only 13,4V at the battery and 13,6V at the engine auxiliary power connector. Battery voltage right after driving is 12,1V, which to me means the battery is only about 30% charged
What do you guys think? To me this sounds like a bad alternator and/or battery.
I also see there are 120A and 150A alternators for these cars. Can I just order the more powerful one? I don't see any other differences. My car is a manual so I know will need the clutch pulley version.