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questions with answers
Car Back Fire Questions and Answers - This category contains featured questions as examples. They relate to most vehicles.
Question: 2002 Ford F150 mileage: 90,000. I am one of those guys that really
enjoys taking care of his truck, it stays in a garage at night, I keep up on all
the services, etc. I was on my way back from visiting my brother in the valley,
heading up an on ramp to the freeway when it started backfiring. I made it onto
the freeway and it seemed ok but now whenever I accelerate the truck backfires?.
I have installed a new fuel filter thinking that is what it could be... but no help.
Thanks for the help in advance.
Answer: There are two main things that can cause this condition. First
is a low fuel pressure condition. Full fuel pressure is needed under load, check
fuel pressure under load it should stay between 35-45 pounds if not replace the
fuel pump. Second is the ignition system. If the ignition system is worn it can
misfire causing the backfire you describe. Check your spark plugs and ignition coils,
replace as needed.
Question: 1998 Jaguar XK-8 miles: 76,000. Hi, I own a 1998 Jaguar XK-8 it
has been a great car for years but now when I take my car out first thing in the
morning it runs rough, seems low on power and sometimes backfires. When it warms
up it seems ok. I have had all regular service work done at the dealer so I took
it in. They charged me $122.00 to tell me they didn't know what was wrong. They
scanned the computer but it didn't show anything and they couldn't get the car to
duplicate it. What do I do now?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).
Question: 1994 Mazda B3000 3.0 L V-6 mileage: 153,000. 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.
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