Hello Micheal
Add this to your reading material - very low DIY cost.
Home Workshop Injector Maintenance
• All the components needed for injector overhaul can be sourced from a local injection specialist
Or from SU/Burlen Fuel Systems (Tel: 01722 412500) under the following Burlen part numbers and description
Or from Burlen Fuel Systems website,
http://burlen.co.uk/
navigate to SU pages and make a site search for the following Rover SD1 Efi Fuel Injector Service Parts
BFB103Q10 - 10 Filter baskets - £5.38
BPC13Q10 - 10 Pintle caps - £2.70
ABF407 - 7.6mm X 2M Fuel Hose - £14.08
BHC1214 - 100 Clamps - £28.00
Prices seen June 2009 plus p&p plus VAT
Note re clamps:- approx 30 req'd for full system refurbishment - buy locally or resell excess to reduce cost.
• Cleanliness is a key factor particularly as there is the possibility of metal debris whilst removing the old hoses.
• Cut off the swaged hose collar at a sharp angle using suitable snips or a very fine junior hacksaw blade and discard the old fuel hose
• Cut off the old pintle caps with a sharp blade being careful not to mark the body of the filter.
• Clean all around the area where the pintle cap fits with fine wire wool and metal polish.
• Clean up the body of the injector and the area where the manifold rubber seals fit with a wire brush, wire wool and polish.
• Blow off any debris and wash the injector in a container of clean “Panel Wipe”.
• Last in this sequence, pull out the old injector filter using a wood screw or small "easy-out" gently screwed into the open end of the filter, bathe the injector again and blow away any more debris with a 100 psi airline.
• Access to an ultrasonic cleaner may significantly improve the cleaning process and if thought necessary such equipment is readily available at low cost on popular auction sites.
• Press a new filter into place using a drill press or vice, protecting the pintle end of the injector with suitable hole in a hardwood block.
• Press on a new pintle cap using a small hardwood block with another small hole to protect the pintle end, ensuring the cap starts off upright to prevent uneven fit.
• It’s probably best to think this next part through and make up a rig meeting the following requirements.
• Temporarily connect a 6” length of hose to the input end of the injector with a hose clip, and connect a 3 volt supply to the injector connector using a switch to pulse the injector on and off.
• Note: It’s possible to use a 12 volt supply but the injector must be protected by a 6 ohm resistor wired in series with the supply and switch.
• Pour a small quantity (about one fluid ounce) of Panel Wipe into the open end of the hose and connect a 30 psi compressed air source securely to the hose sufficient to withstand the pressure.
• Ensure there is suitable lighting to the rig so that one may clearly see the resulting spray pattern.
• Pulse the injector coil briefly with the switch and observe an orderly conical spray pattern with no dribbling.
• Pulse the injector several times and see that the above is repeatable with a clean start and finish to each pulse.
• If the spray pattern is disorderly or dribbles then the injector is probably still contaminated, damaged (or blocked) and should be replaced.
• Complete the above for all the injectors.
• Cut new hose lengths for each injector and ensure there is no rubber debris contaminating the hose interior.
• Couple the new hose to each injector using the appropriate hose clips.
• Assemble the injector hoses to the fuel rail using similar clips.
• Ensure that the hose clip screws are facing in a convenient direction to provide easy access for screwdriver tightening in their final position.
• Fit the other various hose lengths to the fuel rail and the job is complete.
Conclusions
If the ECU can be described as the heart of the Rover SD1 Efi System then the eight fuel injectors can be described as the being at the sharp end.
No matter how well the rest of the system and its associated sensors are set up, if the injectors don’t deliver the fuel effectively, in an orderly spray pattern and correctly atomized then there will be a loss in efficiency.
Even though the injectors are virtually bullet-proof they will obviously have a finite lifetime, variously estimated by the manufacturers to be over 200k miles.
Even so, the supporting components such as the resistor pack and local wiring/connectors are more likely to fail within that time frame.
When the injectors are ready for professional cleaning or replacement then expect he cost to be anything from £150 for cleaning to £500 for new injectors.
Alternatively there are many opportunities to purchase S/H sets complete with fuel rail on popular auction sites that will serve to provide additional units which could then be cleaned as described and the best ones retained for spares.
When I devised the above home-brew process the cost per car was less than £50 and all the bits needed for the rig were found in my workshop.
Plus it was good fun.