I have a RAV4 that I've been trying to get running for a while now. Here's what's working:
- Spark based on simple light tester
- Installed coil packs from a known working engine and new plugs
- Compression is within spec on all cylinders
- Fuel pressure at the input to the fuel regulator is within specification
- Swapped fuel pressure regulator on the fuel rail from a working vehicle and noticed the fuel rail was pretty dry
- Cleaned injectors, tested for clicking with 12V, cleaned fuel rail
- Turned over engine with pressure regulator detached from fuel rail and saw fuel flowing
- Turned over engine with injectors pointed up and saw fuel spitting lightly in a sequence that looked reasonable for each cylinder
- Vehicle won't fire, sprayed starting fluid into intake and it sputters alive once, but then will not sputter again.
I'm going to remove the throttle body and clean it up and look for anything there but I'm pretty stuck. What could I be missing here? The history on the vehicle is mostly unknown. Previous owner said it ran fine then one day she couldn't get it to start and it's been sitting for a long while now.
- There's no engine codes and I had a friend check with TechStream for any additional codes and it's ok
- I've tested the pressure going into the regulator on the fuel rail and it was within spec.
- I pulled the fuel regulator off and swapped it with a working one off another RAV4 (same year and running fine).
- Previously I was getting RPM readings over ODBII while cranking but I'm going to swap out the cam shaft sensor
- When i had the fuel regulator off I cranked it and saw fuel pour out, but not spray (it is a much bigger diameter than the injector nozzle so I think it was ok)
- Injector nozzles when pointed up sort of spurted rather than a full blast spray that I sometimes see on injector test beds on youtube
- Today I swapped out injectors with a known working car and no change
- Tried a cam sensor from another running vehicle with no change
Here are some data screen shots from before and during a few attempts at cranking the engine.
I retested with a fuel pressure gauge and found that even though the new fuel pump was putting out fuel, it was very low pressure < 5psi. Putting a known good pump in for the new one supplied enough pressure to get the car running again. There's still problems, but I'm at least able to drive it and it runs again.
Thanks to everyone who helped give ideas.