BASIC DIAGNOSTIC PROCEDURES -2000 Nissan Xterra SE
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Exhaust System Backpressure
Visually inspect exhaust system for dents, damage and leaks. Repair or replace as necessary. Exhaust system can be checked using a vacuum or pressure gauge.
If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port. Start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge reading slowly drops after stabilizing, check exhaust system for a restriction.
If using a pressure gauge, remove front oxygen sensor. Connect a 0-5 psi pressure gauge. Run engine at 2500 RPM. If exhaust system backpressure is greater than 2 psi, exhaust system or catalytic converter is plugged. Repair or replace as necessary.
Test the fuel pressure while your at it.
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Saturday, September 13th, 2008 AT 6:34 PM