Hi Scotty-
I’ve got a 2012 Toyota Tundra with the 5.7L (FlexFuel) engine. 115K miles.
I’ve recently started to experience “long” starts in the morning, whereby the engine cranks normally but takes 3-5 seconds (sometimes longer) to fire up. On a few occasions it wouldn’t start at all on the first try.
The problem is intermittent and difficult to reliably recreate, but it seems to be worse with colder weather.
Could this be a bad fuel pump or something else? From what I’ve researched, I think this could be fuel pressure bleeding back down into the tank? I’ve seen other videos suggesting this could be fixed with a computer “reflash” to correct for the appropriate fuel mixture.
Thanks,
Erin in Austin
Why not test both operating and rest pressure in the fuel rail and find out?
@chucktobias
Thanks for the suggestion.
I’m not mechanically-inclined so this is above my pay grade.
This truck is going to my independent shop for diagnostics and troubleshooting, but thought I’d come to this forum/ask Scotty if my initial intuition is accurate so I can help those guys go straight to the problem.
It's not difficult, you just hook up a suitable pressure gauge to the fuel rail. If the guys you're taking the truck to know what they're doing that's one of the first things they'll do. However, especially since it's flex-fuel there might be a deeper problem. When going to a mechanic don't tell them what you think might be wrong. Just tell them the symptoms.
@chucktobias 👍👍