01 2.7L Tacoma Starts, than dies

01- 2.7L Tacoma 4x4 Starts every try as long as i turn the ignition all the way off- Than immediately dies 1-3 seconds after.

MAF is new and cleaned out, many other sensors related are either new or have been tested.

Code thrown is for coil pack one misfire(Ill add the exact code later i forgot to write it down)
All four plugs and coil packs are brand new- We even tried an additional new set.
ECU was sent to a Reman facility that tests/rebuilds specifically toyota ECU/ECMs -They said they found no issues with the ECM.

The technician i went to test fuel pressure and he says that tested out as well.

Any ideas out there?

 

With out all the codes we can only guess!

*** If the engine does not stay running you might want to ask the person just how the running fuel pressure was tested **** Cranking pressure might be fine.

Connectors corroded Physical damage to wiring harness .

It sure sounds like The ECM is not seeing a signal from one of the sensors and shuts off the fuel.

Thinking the engine is not running .

Have you tested the Circuit opening relay perhaps the run side contacts are not working causing the truck to stall from lack of fuel.

These engines can be quite finicky with after market sensors.

Now with added unknowns in the mix one circuit at a time. It only takes one bent pin one broken wire .

Best of Luck!

 

An explanation of the circuit opening relay might help. When the ignition key is turned to the crank position the circuit opening relay send power to the fuel pump after the engine starts and the key is returned to the run position the signal from the crankshaft position sensor keeps the circuit opening relay closed. It sounds like the signal from the crank sensor is missing or there is a problem with the opening relay. There should be a wiring diagram on the forum somewhere.

 

Your fuel rail has the pressure regulator on its end....

you can pull that fuel return hose off it and put a short extension and shoot on ground to check steady flow off the fuel pump....

super easy to check fuel flow....