Anyone got any ideas ???

 

Hi Tony,

I don't think the injector coding will affect the results of a leak off test very much if at all.

Are you using the timings listed in my Leak-off Test wiki?

Peter

 

Didn't get them from GAP did you...

Perhaps you could try a non-starting leakoff test? That eliminates codes completely, it's a purely mechanical test of how fast fuel leaks past the control valve when it should be shut.

 

Yes i have been using the timings that are on here, must say there is a bit of knocking going on when cold !

 

got recon ones from Supreme Auto Supplies i did get a price of Gap are they on good ?

 

Yes i have been using the timings that are on here, must say there is a bit of knocking going on when cold !

High leak-off is caused by problems with the internal valve in the injector. In fairness to your supplier it is possible that any contaminants in your fuel system could result in the valve being held partially open when it should be closed.

What make of fuel filter is fitted to your car?

Peter

 

Not sure about make but i got it from Partco !

 

Hmm! You should only use Delphi, Bosch or Ford filters. The also rans might be OK but they aren't specified to 2 microns so who knows?

Peter

 

Yes was thinking about emptying tank and changing filter to rule that end of things out !!

 

If you have the correct filter then you shouldn't need to disturb the tank. Unfortunately you may need to dismantle your injectors (the leaky ones) and clean them. I did a wiki on that too but all the wikis have lost their photos due to something beyond my control so not quite as helpful as they might be.

Peter

 

Ok thanks for that will have a look at cleaning injectors and replacing filter only three will need done as looks like the one I sent back is clean and working !

Tony

 

Just wondered as members here have not always met with success with injectors from GAP...
As far as contaminants go, the problem is that once in the injection side of things some may be trapped inside the injector. So replacing the filter and flushing the tank may be a bit after the horse has bolted. Usually examining the filter contents (diesel and media ) for metallic particles is recommended. A magnet can help, or tip fuel over a sheet of white paper in a tray.

The right filter should keep contamination already passed back to the tank from being passed forward and through the pump again. Problem might be if the source is still in circuit. The particles may have come from a forecourt pump, but these should have the same standard filtration as the correct filter in the engine bay provides. In other words, the likely source is inside the car, and its the pump. Which is between the filter and the injectors, so new contamination can be generated at the pump and travel to your replacement injectors...

 

Ok i have changed the filter to a Delphi one ran it for a couple of miles then put the recon injector back in. It is quieter and more responsive i think, but will need to see what its like one a cold start !

Question is i put the recon injector back in number two after taking out a secound hand one out i had in . Will that injector need recodeing ?

Number one injector is not coded yet ! Dose having no coding on injectors make a big differerance on mpg ?

Sill only showing 37.5 mpg !

 

Hi Tony,

The car will run with wrong coding but not as smoothly or well as if coded correctly.

Swapping the injectors doesn't alter the static codes held in the ECU but may alter the learnt corrections.

Recoding will reset the learnt corrections.

So the bottom line is that it's best to ensure that the ECU has the correct codes for the injectors fitted and in the correct order.

Peter