4agze stalls after a few seconds. Got me stumped!

[nick.parker]

FYI:
The fuel pump relay is operated by two things:

1. Key in crank position
2. Key in run position, but with AFM flap opened due to airflow

One possibility is that during crank fuel pressure is there, and maybe the AFM switch is not engaging (possibly an air leak after AFM). Residual fuel pressure might allow the engine to run at idle for a few seconds after it starts and key is no longer in crank.

A quick and dirty test is :- try holding the key in the crank position after the engine starts, and see if the engine keeps going.

Good Luck,
Nick

[Megz]

What about wiring for the injectors? Dodgy connection may not be giving a constant power(or earthing them, what ever they do) to them?
Just an idea,
Mic

[cam_ra40]

Thanks for the replys. There definately is no pipe leak after the AFM. I even tryed the AFM straight off the TB to bypass all the cooler piping, turbo etc.

I havent been home to test much else so far. Just a couple of simple things like checking all the underbonnet wiring even under conduit in some spots that could flex. checked the plated off cold idle bit on the TB (knew it wasn't this due to WOT having no effect), Fixed a slightly dodgey wiring in the fusable link box and a couple of other things.

I'll set up temp wiring the fuel pump for permanent 12v tomorrow night. If i havent had any luck by Friday i'll send it to an Auto Electrician.

[Starfire]

When I blew an IC pipe on my AW it did exactly the same thing. It would splutter and die after cranking.

You could also try holding the afm flap partially open and tricking it in to running.

The AFM could be on it's way out too. The hot/cold thing could indicate a dry joint.

[cam_ra40]

Had a little bit of success today. Basically with the fuel pump wired directly to the battery, the car runs fine. According to the 4age manual that's uploaded on toymods somewhere, the AFM fuel pump switch thingy, EFI Relay, circuit opening relay or the wiring is the problem.

Also according to the 4age manual, if it is either the EFI relay or the circuit open relay (can't remember which one), JP's trick with the FP & +B terminals won't work.

I opened up the AFM for a quick look and there doesn't seem to be much that could go wrong with the fuel pump switch part, it is very simple and the terminals were touching when closed and opeing when the flap was open with no probs. I cant see any solder joints that could be dry.

Anyhow, does anyone know what relay is the circuit opening relay? my box doesn't seem to have it labeled.

[BeRad]

meaning the fuel pump relay?, im not sure with 4age's but with 3sgt/e's and various other toyotas ive seen there near the ecu under the dash or wherever the ecu is located, if it is the same thing im talking about

Glad to see your finally getting somewhere, good luck.

[JP]

I'd be looking at the circuit opening relay for sure. If the EFI main relay was faulty the ECU wouldn't function for the engine to run. The EFI main relay feeds the ecu, ignitor, injectors etc.

Circuit opening relay is usually mounted on the bracket on the side of the ECU.