Engine shut down - mechanical or electrical issue
Today my car shut itself down whist driving. Not a fun experience, so hopefully someone can help diagnose.
I've only done a few short trips in the time I've owned it whilst gradually restoring. JDM 3SGTE 1990.
The conditions were:
- moderate stop start traffic
- running for around 45 minutes
- approx 30 degrees, maybe more
- temp gauge in middle position
- 4th gear with minimal load, 65-70km/h down a slight hill
- revs suddenly drop and car stalls
- no smoke, steam, leaks, or other signs of trouble
After the car died, the above lights were showing with ignition on. Engine, battery, mystery battery, handbrake, oil pressure?, and possibly intercooler fan?
My initial thought was a dead alternator. The car has shown the orange battery looking light (bottom left) since I've owned it. The battery reads at 12.8 cold and 14.6 at idle, and is always on trickle charge so I haven't been overly concerned. Not entirely sure what the light indicates tbh. It doesn't seam to be in the manuals I've looked at so it's been on the to do list.
When I tried starting, it cranked fine but didn't start. Since the battery seamed ok I then thought it may be temperature related.
I let it sit and cool for 30 mins and what do ya know it started fine. The only light left on was the bottom left mystery battery light as per usual. I took it easy on the drive home and gave it another 30min rest half way. It started again with no problems.
The radiator fans and intercooler fan were all spinning when got home. I believe that the radiator fans have a fail safe to constantly run if there's a problem with the sensor. Does the intercooler do this as well?
I'm wondering if there's a loose connection somewhere causing the intercooler fan to work intermittently.
Any other ideas? Are these things known to shut down if engine bay temps get too high, and is that why aftermarket engine lid fans are popular?
Probably not relevant but the car doesn't like cold starts. It takes a while to kick over which I'm guessing is due to a faulty cold start sensor or injector. It's always started quickly once warn.
It's going back to the mechanics when I get around to booking for other unrelated maintenance, so it would be great if I could at least point him in the right direction.