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You can either loosen each injector line one at a time while the engine is running to listen for a drop in RPM, or you can use a voltmeter set to millivolts to probe the GP spades (with the GP leads disconnected) to see if they're putting out any voltage. It would be in the 0.5-5.0 millivolt range usually, and all GPs should read relatively even. If you have a reading that is way off, you can swap that glow plug with one from one of the 'normal' cylinders and retest it. If the abnormal reading moves with the GP, you have a bad GP, but if it stays with the cylinder then there is something wrong with the injector in that hole. This test is done once the engine is fully warmed (so it'll start w/o GP harness connected).
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1986 F250 2WD Super Cab XLT Lariat w/ 1996 front clip. Dually bed & van rearend (2" wider, allows spring clearance). 6.9 w/ approx 120,000mi. Banks non-wastegated turbo system, Beru ZD1A glowplugs, Delphi BB injectors, Kenworth pyrometer, vac/boost gauge, electric water temp/oil psi/voltmeter mounted in dash. 3" Mandrel-bent open exhaust. C6 trans, 3.54 gears. Okiegringo idler pulley. R134a A/C conversion. WMO/diesel blend in one tank.
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