Question about 2002 Nissan Xterra

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No. 4 Misfire

I have a 1999 Xterra, 3.3, V6. No. 4 misfire. New plugs, wires, knock sensor, distributer. will hold 90 on compression. #1. What can cause the misfire? #2. Can a lifter or injector be the cause? What would you recommend my next step be? Thank You. LaDonna Grubbs

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  • Nissan Master
  • 5,628 Answers

You have distributor cap or coils.Fuel filter,vacuum leak.

Posted on May 01, 2013

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Posted on Jan 02, 2017

duane_wong
  • 6826 Answers

SOURCE: will a bad knock sensor cause a misfire. car is

A Bad Knock Sensor will not cause a misfire, unless the advance is off due to a faulty Knock Sensor. The O2 Sensor will cause a random misfire.

Good luck on this repair.

Posted on Jan 21, 2011

jturcotte
  • 7782 Answers

SOURCE: Ok/ I have a 02 Xterra. V6 ... Auto zone scanner

Hi, you will want to fix both codes. The reason is that when the computer is not getting data from the knock sensor it defaults to a safe ignition timing that reduces performance. The misfire requires troubleshooting. First check the plug and wire. If that's good, run a compression test. If that's good, check the injector pulse (use a voltmeter set to AC, and compare voltage to other injectors--with engine running). If the pulse is good, check to see if the injector is clicking. If it isn't clicking, you know it's bad. It might also be clogged, but you have to pull the fuel rail to see if it's clogged. Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are genericinstructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 10, 2011

skychief2001
  • 21873 Answers

SOURCE: Engine misfire and knock sensor bank 1 codes on 1999 Nissan frontier 3.3 v6

I would want to see the actual codes, but if it is one or two cylinders you could have a failing injector and it not show up as a trouble code.
If one of the injectors is failing it can have a high resistance and affect the other injectors in that circuit.
The O2 sensors and cat would not affect a power loss in one or two cylinders, and the O2 sensor codes would be present.
The knock sensor only measures vibration, so it was probably ok before you replaced it.
There is a chance the cap is shorting out internally which would be tough to see, and the optic sensor in the bottom of the distributor could be causing problems too. Some of the cylinders may not be firing when you think they are.

Posted on Sep 21, 2012

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Hi, you will want to fix both codes. The reason is that when the computer is not getting data from the knock sensor it defaults to a safe ignition timing that reduces performance. The misfire requires troubleshooting. First check the plug and wire. If that's good, run a compression test. If that's good, check the injector pulse (use a voltmeter set to AC, and compare voltage to other injectors--with engine running). If the pulse is good, check to see if the injector is clicking. If it isn't clicking, you know it's bad. It might also be clogged, but you have to pull the fuel rail to see if it's clogged. Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are genericinstructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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1999 Nisian Maxima and need to know what codes mean?


P1320 Ignition Signal
Signal wire from distributor
P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
O2 senor ( The one before the cat converter )
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The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect fuel pressure

EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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Check engine light on. 4 cylinder. Light flashes on acceleration. Sometimes idles rough. Computer scan reads random misfire and #2 & #3 misfiring. Added fuel injector cleaner but no help yet. Cleared...


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1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
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f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

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