Problem Reports

 Rookie

2006 Nissan Armada SE - both catalytic converters were replaced under warranty at 70,000. At around 80,00 shuddering, and unable to stay running, dying in motion, etc. took it to an independent mechanic, not dealership. He replaced fuel pump, but after test driving for a while he said the problem was still present. I don't know what he did to resolve it (something about a sensor maybe), but he returned my car running fine. However, the engine service soon light had come back on shortly afterward. A recent diagnostic for yearly inspection sticker showed both catalytic converters failing. Took it to Nissan - they said the fuel pump had damaged the catalytic converters and that all needed to be replaced ($2,200). They also said that the 02 sensors could potentially be "sucked in" and the engine would need to be replaced I took it back to the mechanic who installed the fuel pump, who said that Nissan was taking advantage of me, and that there was nothing wrong with the car. He turned off the engine service light and said he would get it inspected for me (suspicious? maybe has a friend in the business who will give him a sticker). I don't feel comfortable with his diagnosis, and don't know whether to trust Nissan service department either. I am afraid to drive it for fear of destroying the engine. A third opinion would probably be prudent at this point. Any advice would be appreciated.

ON A TRIP FROM NY TO FLA ENGINE LOST POWER,STALLED. WENT TO DEALER AT FIRST DIFFICULT TO DIAGNOS, BUT TURNED OUT BAD FUEL PUMP, THEN KILLED CATALYTICS, CRACKED MANIFOLD. NOW NISSAN HAS A ECM RELAY RECALL.

Hesitation with a wide open throttle, then when you back off the throttle the truck speeds up.