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Without New Generation Star (NGS) Tester

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  1. Ensure engine is at normal operating temperature. Disconnect Manifold Absolute Pressure (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.
  2. Ensure hose is long enough so gauge can be put inside cab of vehicle. Road test vehicle. Observe pressure gauge and accelerate vehicle to achieve highest boost level (2500-3500 RPM). Note pressure reading. Boost level will level out after 3000 RPM. If boost pressure is 16 psi (110 kPa) or more, boost level is okay. If boost level is not okay, see DIAGNOSTIC AIDS.