CEL flashing motor dies

hey guys, hopefully someone can help me out with a little information.
I took my truck racing at the rally track this past weekend and drove it home with no issues, i went to drive it yesterday and i can give it small throttle and ramp up and have no issues. but if i goose the throttle the truck instantly dies and the CEL flashes. with out doing anything to it, after a minute in the off position the truck starts right back up with no codes.

im thinking loose connection somewhere but ive never seen the CEL flash with the truck not running before

 

Scan it for codes

 

Flashing means catastrophic misfire.

you 100% need to scan it before anything else. It could be 100 things.

 

Get a scanner like the above folks have said.

check your coil packs (whatever they’re called) and your plugs.

 

I said in the original post no codes. I did scan it for codes within 20 seconds of it dying and no codes came up. It didn't flash until after it died.

 

Then starts back up with no codes and runs like a champ, perfect 14.7 afr. Until I goose the throttle and it instantly dies. Not stall, like shuts off completely

 

No codes no bueno

make sure all connections are tight, battery too, start with all the physical points. Tighten gas cap too for the hell of it

 

I'm wondering if the flashing cel is it telling me it's not running anymore, I'm thinking a loose connection somewhere but it would have to be ecm related for it to shut off instantly

 

Your wording seemed a little confusing.

So I'd be leaning towards fuel delivery causing stall. It's happening so quickly the code is likely pending then it stalls.

Fuel pumps/fuel pressure has no codes, only lean which takes a bit.


This sounds like a fuel pump dying, but I'd check the fuel pump resistor and the relay as well. The resistor is in front of the battery.

 

I have nothing in front of my battery if your talking about close to the front of the truck.
The fuel pump is brand new and gives me consistently 45psi including under load. Everything on the motor is brand new. I just went through sorting an electrical issue that caused a not start condition. But I replaced that fuse box that was giving me issues.

 

See the link below for where to look for the resistor/

https://www.tacomaworld.com/threads...ing-issue-2014-v6.468581/page-2#post-24609375

 

This may be the cause. I did Jump the shit out of my truck multiple times this past weekend and I have yet to find a great battery hold down so it could have bumped the resistor and it could be killing the fuel. Crazy how it shuts off instantly. But I guess with fuel shutting off it would be losing pressure and then shutting down pretty quick

 

@TnShooter you should remember the hell I went through haha

 

I'm thinking either a shitty power/ground at the PCM or something is spiking the PCM and causing it to reset.

Just for grins try unplugging the coils one at a time and see if it still does it on each one.

Yea I want back and found your thread, that was an adventure for sure.

 

It sure was.
That was a long one for sure.

 

Does what? It doesn't stutter at all. Just straight dies haha
If I unplug the coils I'll get misfires? But I'm not getting misfires when running it driving. Only shut down when I goose the throttle. I did add in a aux light relay but it's on its own circuit off my aux fuse box so that shouldn't matter

 

Did the problem start after you added the aux lights?

 

Well I took it from races and then just hooked the power line of my aux relay to my fuse block, then drove it a bit. Went to goose it and it just died lol so I have no idea when it started because I didn't goose it at all for a week

 

A high voltage spike on certain circuits of the PCM can cause it to reset which would result in a stall.

Ignition coils can be a source of such spikes, the voltage (Kv) required for the spark to jump the gap on the spark plug increases as cylinder pressure increases and snapping the throttle will cause a spike in cylinder pressure. A flaky coil can send flyback voltage spikes through any of the wires connected to it when it is stressed but yet not cause a misfire, this is typically more of a problem on vehicles where the coil driver is in the PCM but it still can happen on ones like Toyota where the driver is in the coil.

It would be very easy to catch such spikes watching circuits with an oscilloscope but the next best thing you can do is unplug coils one at a time, do your same throttle snap that makes it stall, and see if it still stalls.

 

I have to be driving it to do that. That's the only time the trucks done it