all cylinders throwing misfire code

This ^^^^

You are wasting time checking fuel pressure at this time.
There’s no way around it, you have to find the fault with the IGF circuit.
Which, is probably a coil. (Even though I doubted it at first).
@Dm93 does this stuff all day everyday. They’re only a few people I’d take their word for on this forum.
He is one of them.

 

I had this issue recently. I was using RIPP coil packs. I took them out and swapped to stock and problem went away. I did first try a crank sensor which made no change. You got a bad coil pack, when the truck won’t run unplug one at a time until it runs and that’s your issue. Or just replace all of the coil packs if you really want to.

 

thanks for all your replies. Had to work last couple days. Going to hit it hard today. Going to try disconnecting one coil at a time. ( when acting up) see if that makes a difference.

 

Agreed. (the part about Dm93) I don't know squat about the IGF circuit.....

 

Keep us updated.
If you have any additional questions, we’ll do our best to help.

 

Essentially it's a feedback wire that allows the pcm to "watch" the coil field collapsing. It can monitor the health of the ignition coil by the size and strength of the field it generates

 

Pretty much this but it doesn't really monitor the health of the coil (at least not on our system), essentially each coil sends back a pulse to the PCM to confirm the coil fired.
This is what it looks like on a scope, the PCM sends out 5v on the IGF circuit and each coil pulses it to ground when it fires. If the PCM doesn't see the pulse it sets a coil circuit code for the missing coil and disables the fuel injector for that cylinder to protect the catyletic converter.

 

Crank position sensor or TDC sensor, truck runs fine just shifts all out of whack.
Has anybody suggested resetting the ecu 1st? Unplug the battery or pull the EFI relay in the under hood fuse box.

 

Back again, Finally getting back to it. I appreciate all the links and advice. Thanks Dm93 for link to testing IGF circuit. I'm not getting voltage on IGF circuit. even with all coils disconnected. This may seem really stupid but I'm trying to find ECM and test voltage. I'm assuming it is one of the modules behind the glovebox. None of the connectors match the Diagnostic sheet. trying to Find E4 #24 pin to check for voltage at ecm, but I'm at a loss to find that correct connector on the vehicle. Looking for that red w/ white wire. Its probably right in front of me, why can't I find it? This is a prerunner which I'm hoping shouldn't make any difference. I've looked through a lot of threads and pics and I feel stupid even asking, but hopefully someone can help. Thanks
PS I did have another Tacoma same model everything which ran fine. I swapped all the coils and still got the same problem. Obviously I need 5v in the IGF circuit

 

The PCM is behind the glovebox on the right side, the white/cream colored box with 6 connectors is J/B no 2.

 

You're a life saver Dm93. I was going off the diagnostic sheet that was in your link. It must be for a different model. Looks like I'm looking for E11-6 Pin

 

I'm guessing you mean the link @TnShooter posted, that diagram is for an 05.
If you find you have no voltage on that pin at the PCM you will need to dig J12 out of the harness.

 

Well I checked voltage at ECM and am getting 1.29-1.4 volts. Checked the ground side of circuit from e11-12 pin and to a body ground ..same voltage. With everything disconnected checked for short to ground and no short. Does this mean it has to be ECM? Is there any other checks I should do?

 

just read your other post. It was Tnshooter. Isn't the J12 junction between ECM and coils? could it lower voltage at ECM? I will check that. Can I ask where J12 is located?

 

Find J12, unplug it and check Pin 4, it's taped inside the harness under the PCM.

 

I have the same voltage at each one of the coils as i do at ECM. If something was wrong with J12, wouldn't i have differing voltage readings?

 

Unplugging J12 isolates the PCM from the coils and associated wiring, trying to be 100% sure it's not a circuit fault before condemning the PCM.

 

SUCCESS!! When I cut open the sheathing around harness, where J12 was. Water came pouring out! J12 was submerged in the water. Took it apart, cleaned terminals and it fired right up! Yahoo! Not sure where the water came from. Will check further. maybe drain from ac or some type of rainwater leak? You guys are da bomb! Kudos to Dm93 and Tnshooter

 

Nice, about the only place I can think of where water could get in the harness like that is where it exits the firewall in the engine bay.

 

And that, ladies and gentlemen, is how you don't throw a pcm at a car

Well done