fuel priming

[KERRSURF]

Any ideas on why the rev counter needle would waver so much and the engine note remain steady?

[BUSHWHACKER]

Any ideas on why the rev counter needle would waver so much and the engine note remain steady?

I don't have a 3.0 wiring diagram, but the 2.4s RPM signal does go through the ECU, so I guess the 3.0 does too, which, with the problems you are having suggests your ECU is faulty.
Can you borrow a good one to try?

[KERRSURF]

I'll see if Andy can lend me his, thanks for the input.

[Albannach]

Aye, come round and get it if you want it just now, or I'll bring it up later this afternoon.

[TonyN]

have you done the fault codes yet? still might be helpful.

Any ideas on why the rev counter needle would waver so much and the engine note remain steady?

You've only messed with the plugs on the fuel pump, I'd be checking these again for pulled wires maybe?

[KERRSURF]

Aye, come round and get it if you want it just now, or I'll bring it up later this afternoon.

I'll come and get it in the morning if thats ok.

Is a 2.4 spill valve the same, just in case I need to get one from scrappy to try.

[KERRSURF]

have you done the fault codes yet? still might be helpful.




You've only messed with the plugs on the fuel pump, I'd be checking these again for pulled wires maybe?

I'll check codes in the morning Tony, swap the ECU's if needed and go from there.

[KERRSURF]

ECU showed no faults.

Swapped ECU with Andy's, no joy.

Checked voltages across the plugs we could check, check the resistance too.

Cranking motor, no fuel coming to injectors, tried later and it nearly caught but lacking battery power.

Batteries back on charge.

Now, I tried unplugging the plug in the pic below with ignition on and then plugging back in, no click from solenoid, is my Timing Control Valve perhaps to blame and could it work intermittently?

[KERRSURF]

If this might be it, how do I remove it?

[TonyN]

Now, I tried unplugging the plug in the pic below with ignition on and then plugging back in, no click from solenoid, is my Timing Control Valve perhaps to blame and could it work intermittently?

It could easily be. Not to sure how the TCV works, if it actually shuts of fuel, or just alters the injection timing.

Never taken one out, not sure if they just come out after unbolting, have an old pump in garage, can look at that one tomorrow to save you doing something irreversable! lol

[Albannach]

I'm kind of lost with what's wrong with Alan's truck. Clanky stuff I can do, electrics I understand, electronics confuse me!

What I can't square is how an electronic component can fail when mechanical work is being done. And I'd have thought the likes of the TCV would throw a fault if it had ailed?

The fact the truck ran perfectly for 10 minutes is another enigma. I can't stop thinking it's a vacuum problem, but I can't see where the problem is!

[BUSHWHACKER]

I'm thinking vacuum too, and the answer is probably in these pictures...
http://www.hiluxsurf.co.uk/forums/sh...ad.php?t=64279

[KERRSURF]

I've tried swapping the pipes from VSV's around, still no joy, Andy checked the UFO (dunno what it's really called) was moving ok, so it's def getting vacuum.

On the VSV valves I knocked off one of the wee plastic baffle outlets when putting it all back together.

Tony has said this whole VSV setup can be chucked away if need be.

Any news on the pump inspection Tony?

Might see if Brian can go to scrappy and get another pump tomorrow.

[KERRSURF]

I checked/cleaned all connections to pump. check timing valve control solenoid was operating with battery power, check vac pipes again, cracked injectors, tested resistance readings on each plug. Fuel coming up to pipe ends, engine cranks, tries to fire but won't catch.

I'm gonna swap the spill control valve (what does this actually do?) tomorrow.

Gonna take out injectors and clean them and blow airline through hardpipes.

Any other ideas?

[KERRSURF]

Just found a bit of info on Spill control valves.


The Spill Control Valve
In the modern low emissions engine the fuel injection is controlled by the spill control valve. What the
spill control valve does is to prevent the rise of fuel pressure in the fuel injector by staying open until
closed by an electrical signal from the ECM. Once the pressure in the injector has risen above the
nozzle opening pressure fuel is injected into the cylinder. End of injection is controlled when the spill
control valve is opened (by removing the electrical signal from the ECM) and injection ends.
Typically fuel pressure in low emissions engines are in the range 1600 to 2200 bar. The spill control
valve has to be capable of opening and closing with such pressure present and also of being operated
by a relatively low power electrical signal from the ECM. The design of the valve is such that the
pressure acting on both sides of the valve are balanced, the additional force required to move the valve
from the open to the closed position is provided by an electromagnet which the ECM controls.
An important consideration of the design of the electromagnet is that is has to operate at high speeds
and for this to take place it is desirable for the magnetic force applied to the valve is kept to as low a
force as possible as the magnetic field takes a finite time to decay before the valve will move.
The valve itself has no seals inside and relies on very accurately machined components with a running
clearance in the order of 1.5 to 3 microns (for comparison purposes the average human hair is about 40
microns in diameter!) to prevent fuel leakage.