What would cause the output voltage to drop at the MAF sensor when engine warms up in 2002 nissan frontier 3.3

SOURCE: 2002 Nissan Frontier timing belt

Timing belts are found on the 3.3L engines, timing chains are on the 2.4L engines. The 2002 3.3L Timing belt is changed at 105K during the major service. This service can run over one thousand dollars. It is recommended to replace the belt, tensioner and idlers, cam and crank seals, water pump, and both belts when changing the timing belt. That way, you only open up the front of the engine every 105K. Why change the timing belt and have a water pump start leaking only 20K later and ruin the belt with antifreeze? Other items during the 105K are a major tune up with all the fluids changed and a lube. This does get expensive. You can break it up into several blocks of time and spread the related service items out over a few months to take some of the sting off.

SOURCE: Knock Sensor 2002 Nissan Frontier

The job of the knock sensor is to detect the vibrations of engine "knock" caused by an advanced ignition system. It allows the fuel mixture to run extremely lean and efficient and when it can't perform at maximum effeciency, it "knocks" like it has bad gas and the computer gets the signal from the sensor and changes the ignition to ****** the spark and make the knock go away. If the computer is confused by the signal (too much signal, no signal or too frequent signal) the computer flips the light on with a 0402 code.

If you hit a pothole and the light goes on it might have got too much signal. If it starts going on at other times, you may have a sensor that is sending out too many signals and it might be from bad gas that the computer can't control the knocks.

Walker

• 146 Answers
• Posted on Jul 27, 2009

SOURCE: Camshaft sensor - where is it?

There are two cam sensors and they are located on the back of each head in line with the intake cams.

SOURCE: engine repair code P0325

po325--ignition system or missfire.

Marvin

• 85242 Answers
• Posted on Oct 30, 2009

SOURCE: Where is the knock sensor located on a 2003 nissan

It is located on the engine block itself in the valley between the cylinder heads. The entire intake manifold has to come off to access it:

Testimonial: "I am well satisfied with the quick response and information. Chuck"