I have been having intermittent crank and no start problems with my 2010 Toyota 4Runner. The car has around 186k miles on it. It goes into crank and no start cycle after driving around for a while and then stopping.

Before I was using jump starter pack, which was helping every time, but now it doesn't. Not sure why extra boost would solve the problem. The last several days I had to be towed twice to my house.

When the car was still in crank and no start cycle I started to do the diagnosis. After eliminating NO Spark issue, I moved to NO Fuel issue. I started by spraying starter fluid into intake manifold to bypass fuel pump completely. After several cranking attempts it finally started. The engine hesitated a little bit, burning starting fluid, and then it started to run normally. The car would fire up right away, like there was never an issue.

I started to test the fuel system even further. Power circuit to the fuel pump and fuel pressure were checked, and everything was up to specs shown in the repair manual. Today I replaced fuel pump, hoping that this would solve the problem. The car starts up and runs fine, but I am having intermittent crank and no start issues.

Here is the video of the problem I am describing.

Intermittent starting - fuel pump just replaced - YouTube

...

This is everything that has been done and tested on the vehicle.

BATTERY

The battery is AGM battery that is fully charged. I have a battery tester that checks every single thing.

- CCA are at 710A
- 12.5V charge
- Alternator charging AGM battery at 14.5V

...

FUEL

Fuel Pump (just replaced with BOSCH fuel pump)
- Fuse is fine.
- EFI relay is fine.
- C/OPN relay is fine.
- FP is receiving positive input with key in the ON position, but no negative input. With key in START position the pump is receiving both negative and positive inputs.
- Fuel pressure is 50 psi with key in the START position.
- Fuel pressure is 36 psi with engine not running. The pressure don't drop.

Fuel Injectors
- Did a listening test on 5 (couldn't reach the other one). Every one of them clicks. No misfire codes.

...

SPARK
- Did spark test one of the the cylinders. > 1 inch spark.
- No codes for camshaft or crankshaft position sensors.