If the blower motor intermittently stops in all the speed selections. The problem will likely be the blower motor. I would not run out and buy a new motor until you inspect related components and see if you can identify other problems before ordering. It's possible that the climate control panel has a fault or the speed resistor. I would start at the blower and go to the next suspected component. If at the time the blower stops. If you tap on the blower housing and it starts to operate, that is it. Inspect the plug at the speed resistor and the blower motor. If the plugs and pins are damaged from overheating. They must be replaced before completing repairs.
SOURCE: 1998 infiniti QX4 break squeeling
some times it might be that it just needs to be sanded down or there is too much break dust. so just spray it down with a power wash and if it doesn't work try to sand down the roaters. but be carefull.
SOURCE: how many catalitic converters are on the 2001 infiniti QX4
There are only to Catalysts monitored by the ECM. There is a wide pipe near the front of the exhaust system that looks like it houses a catalyst, but it doesn't. Look for the rear O2 sensor, that is where the catalyst is. If the bolts that hold it on are not badly rusted, and depending on your mechanical aptitude you could replace them, otherwise take it to a shop. Have you checked the warranty coverage with the dealership?
SOURCE: Pls where is Swirl Control Solenoid Valve located in Infiniti QX4
This link shows the location of the SCV, If your motor is different the location should be similiar. http://img510.imageshack.us/img510/5687/vacuumdiagramuh3.jpg
There's a vaccuum line that runs off the SCV to the SCV check switch.
P0442: Have you inspected the lines, charcoal cannister etc? Make sure the fuel cap is tight. The easiest way to check the system is to have someone perform a smoke test. I had a DTC on my car which indicated a EVAP problem, it turned out to be the Fuel tank evaporator Control Solenoid.
SOURCE: 1998 infiniti qx4
shift solonoid b is in the transmission. not a do it
yourself situation. clear the codes and drive , see
if it comes back before you take it in for repair.
also check wiring going to trans. look for broken
wires and wires that are rubbed through
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