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Mazda
B3000 Truck
Repair Questions and Answers
Question: 2000 Mazda B3000 mileage:
123,000. I recently had a tune up done to the truck and
had the plugs, wires, rotor, and cap changed. It was
also discovered that the thermostat was stuck open that
was changed too. Now, after the truck warms up there is
a low burping and repetitive backfire in the exhaust
system. The repair shop has no clue. They say that there
are no fault codes being produced. A compression test
was done and the results were fine 155 to 150 lbs,
except for #3 and #6 at 147. The shop has test drove the
truck and knows that it is happening but cannot give me
any answers. They say the have tested the injectors, O2
sensors, compression, and done multiple computer
diagnostics. The longer distances I drive the truck the
more repetitive the backfire and louder. What could be a
possible solution?
Answer: Check the air diverter valve
and vacuum hoses. Check for vacuum leaks and check the
air injection system
Question: 2001 Mazda B3000 mileage:
96,000. Hey guys, I have a new motor, complete new pads,
wheel cylinders, master cylinder, and I can't get a
pedal, tried everything! My brakes don't work.
Answer: Sounds like you have air in
the brake system. Try removing the master cylinder,
"bench bleeding" it and then reinstall it and bleed the
entire system. If the low pedal still persists, try
replacing the rear anti-lock brake valve.
Question: 2002 Mazda B3000 mileage:
55,000. Recently, the truck has not been running up to
par. It started off with the idle speed at low Rpms,
{500-600) and would surge up to around 900-1000 and back
down. After driving the truck for a few days, the
problem became worse and would stall when stopping in
traffic. However, the truck ran fine at normal driving
speed. {45-65 mph} After a few more times on the road.
Since that time, I have replaced the O2 sensor. Also, I
have made inspections to the air management and vacuum
emission hoses. So far, I cannot locate any leaks. Truck
is super clean. I am still having the problem of getting
the truck to idle and after the truck reaches normal
operating temperature. It will repeat even after
re-setting the computer. I have scanned the main PCM but
no codes what could be wrong?
Answer: This is a difficult
problem to detect because the computer can not sense a
malfunction, the vehicles computer system thinks
everything is ok. In reality what is happening is the
electrical component inside the MAF sensor becomes
contaminated by air impurities. These containments imbed
themselves to the electrical component that senses the
air flow causing the sensor to be slightly off, but not
enough to trigger the MIL (malfunction indicator lamp).
Replace the MAF sensor with a new. NOTE: (Mass Air Flow
MAF sensor or Air Intake Sensor AIS, depending on
manufacturer. It does the same thing only with different
names).
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