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Home >> Triumph >> 1973 >> Spitfire Eng CD FP, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Exhaust Emission Systems >> Testing >> Checking Idle Retard (TR-250 & TR-6)
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Checking Idle Retard (TR-250 & TR-6)

Start engine and while idling, look at advance diaphragm unit (front). See if it is drawn in towards engine 1/8". Slightly open throttle linkage, front diaphragm should move 1/8" away from distributor. If movement is not apparent, check vacuum control valve connections and retard diaphragm.

NOTE: Rear diaphragm is fixed and does not move.
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