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Home >> GMC >> 1987 >> Forward Control 7.4 W, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - Diesel >> Adjustments >> Injection Nozzles >> Spray Pattern Test
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Spray Pattern Test

Due to design of injector, spray pattern test may not be accurate. Do not replace injector for spray pattern test failure.

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