I am thinking of cleaning my injectors while I have them out to renew the hoses. I was looking at pulse kits and this seemed pretty good:

Basically it pulses the injectors at various millisecond durations while you have the individual injector hooked up to a can of brake cleaner. Can anyone help with the following, please:

1. do these things work?
2. will a single pulse of a duration of 255 milliseconds be Ok and not burn out the injectors?
3. will a set of 50 pulses of 7ms each be Ok and not burn out the injectors?

Any help greatly appreciated. I cannot seem to find the factory injector pulse data anywhere for the pre facelift HE..

 

I have that tool. Setting it to mode “4” makes a rapid continuous pulse without damaging the injector. Is it right? Dunno. Didn’t hurt my injectors on many cars.

I did not use it however for “cleaning”. I was using it for testing if they worked.

For cleaning, one benefit of using jaguarfuelinjectorservice is that Mr. Faircloth will do a comparative flow test of all injectors. Any injectors that flow at a different rate can be swapped out for one of his used units. You’ll have trouble measuring flow without running all 12 at once into graduated cylinders. Second test he does is for leaks, and you’ll have to use some sort of pressurized liquid (and brake cleaner is not pressurized once it’s left the can!) to see if fuel will drip when the injector is not firing.

 

OK guys, for those interested, here is what I have done:
I bought the pulsing gizmo linked in post 1.
It has hard plastic adaptors, one end of which goes on,to the aerosol spigot (the usual button removed). The system relies upon there being a pressure tight fit from the can spigot to the injector (if not the injector will not be under pressure so no spraying will occur). Then when the pulsing starts, the injector sprays as it would fitted to the engine.
The inlet end of the injector must be fitted into the other end of the plastic adaptor; but our HE V12 pre-6 litre injectors are not a good enough fit. So this is what I ended up doing which works really well, after a number of disastrous attempts!

The carb cleaner aerosol


The plastic adaptor showing the hole into which the inlet end of the injector must be fitted and be pressure proof


The adaptor in place with a short piece of 7.3mm injection hose pushed into the adaptor hole



On its own the hose is not tight enough to be pressure proof. So I took a piece of 8mm steel tube from my useful bits stack, cut off about half an inch and pushed it into the length of hose while the hose was already pushed into the adaptor. It very effectively tightened the fit and thus sealed the hose into the adaptor hole.


The entire lash up ready to go. The hose barb must be held onto the hose with a clip, otherwise it gets pushed out by the pressure. An aerosol has about 3 bar in it, I have read, so quite close to the normal operating pressure of the fuel system of 2.5 bar.


The gizmo injector leads are just pushed over the injector male pins


This is the gizmo connected up and put into mode 7. There are 8 different modes of operation being different lengths of pulses and numbers of pulses. The label is not resistant to carb cleaner!

So all you do is lightly engage the adaptor/injector assembly onto the aerosol spigot using one hand, switch on the gizmo with the other and simultaneously push the adaptor down. I had the injector itself gripped between my first two fingers and thumb, and pushed down with the heel of my hand. The injector pulses and if your injector is good, a fine fog of cleaner pulses out of the injector! Assuming your seal is good, run the pulser a few times without activating the areosol to relieve the pressure before removing the injector from the adaptor.

I had 12 second-hand injectors of unknown provenance in my stash, so far I have tested 7 of them, and thay all spray just as welll as my new one does. Proving that they are pretty decent items.

 

See post 3 above, I managed to get the injector pressurised by the aerosol and this also meant the test can show leaks. I have taken on trust the flow being reasonably similar across the ones I have tested so far, because the spray looks so atomised (an dropless fog of cleaner coming out in a nice narrow cone) I doubt they are far out of spec.

 

I managed to get a shot of the system working. This is the spray pattern all 12 injectors showed. Not bad for 35+ years old and with no use for over 25!