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Home >> Ford >> 2003 >> Excursion 7.3 F, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 7.3L Diesel >> Engine Performance Diagnostic Procedures >> Test 14: Boost Pressure Test >> Recommended Procedure (Without Scan Tool)
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Recommended Procedure (Without Scan Tool)

  1. Ensure engine is at normal operating temperature. Disconnect MAP sensor hose at intake manifold. Install a "T" fitting between MAP sensor hose and hose nipple at manifold. Connect a 0-30 psi (0-207 kPa) gauge to "T" fitting. Ensure MAP sensor is connected for this test and that hose is long enough so gauge can be put inside cab of vehicle. See Fig 1 or Fig 2 .
  2. Road test vehicle up a hill or with vehicle fully loaded, with accelerator at wide open throttle. Note highest boost reading while accelerating through 2500-3000 RPM range. Boost level will level out after 3000 RPM. On Econoline, pressure (boost) reading should be 13 psi (90 kPa) or more. On Excursion and F250-550, pressure (boost) reading should be 16 psi (110 kPa) or more. On all models, if boost level is not okay, see POSSIBLE CAUSES .
Fig 1: Connecting "T" Fitting To Pressure Gauge (Econoline)
G00096721Courtesy of FORD MOTOR CO.
Fig 2: Connecting "T" Fitting To Pressure Gauge (Excursion & F250-550)
G00096722Courtesy of FORD MOTOR CO.
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