Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mini >> 2012 >> Cooper Base, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Engine Controls - Basic Testing) >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Exhaust System Backpressure

Exhaust System Backpressure

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 1997 BMW Z3, 1997 BMW M3, 1997 BMW 840Ci, 1997 BMW 740iL, and 1997 BMW 740i. However, it is still accessible from the selected car via links, so may be relevant.

The exhaust system can be tested with a vacuum or pressure gauge. If using a pressure gauge, remove HO2S or air injection check valve (if equipped). Connect a 0-5 psi pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 2 psi, exhaust system or catalytic converter is plugged.

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 indication slowly drops after stabilizing, inspect exhaust system for restriction.

scientia non olet · About Mike's Workshop Manuals