#GUNSON GASTESTER MK2 PARTS FULL#
Set the Allen headed air bypass screw approximately 2½ turns out from full home.The screw should be approximately half way between fully up and fully down typically 4-5 turns out from fully home providing the idle air bypass gallery is completely clear Replace the connector, start/warm-up the engine and adjust the plenum idle air screw to run the engine near the preferred idle speed of 800-850 rpm.
#GUNSON GASTESTER MK2 PARTS MANUAL#
According to the workshop manual for the Rover SD1 Efi System, the expected CO content reading should be 1.0-2.0% at an idle speed of 800-850 rpm.With the engine at operating temperature, preferably after a normal run, measure the CO content at idle.
A commonly available CO meter is the “Gastester” made by Gunson as either a basic unit or a more advance system, both available on Ebay for a modest outlay.Having said that, the AFM is the primary controlling source of injection mixture information and if it is abused then the system has very little chance of accidentally correct adjustment.Thus, any fear about opening the AFM can be mitigated if owners spend loads of money unnecessarily buying new components or so called expertise when an AFM problem might be resolved with minimum outlay or hire/loan of suitable equipment and a couple of hours of sensible research and careful adjustment.Therefore any expensive expert HELP may well be compromised if adjustments are unsuccessful due to faults elsewhere in the system.In a perfect world the adjustments described here should only be made by experts but such specialists are difficult to find locally and may well be too expensive given the vagaries of our Rover SD1 Efi System and its potential for error.Calibrated Adjustment (including reasons 3, 4 and 5 above)