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.
Crank position sensor is a very common failure on altima and will not set a code in most cases
symptoms stalling at low idle, stop and go traffic and at red light
Friday, October 8th, 2010 AT 10:02 PM