Question about 2004 Kia Rio

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Misfire #4 low pressure in #4 about 90 did leak down only 6 percent lost in all 4 cylinders checked timing and air intake system plugs and wires coil in process of checking ckps and cmp and fuel system

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The 90 PSI cylinder pressure is the cause of the miss. You must have a leaking valve.

Posted on Mar 08, 2009

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Posted on Jan 02, 2017

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03 Nissan Altima showing codes P0304,P0102,P0154,P0113 what are they and how do i repair the problems.


Hi Chris.

p0304 = Number 4 Cylinder Misfire Detected

Faulty spark plug 4
Clogged or faulty fuel injector 4
Faulty ignition coil 4
Fuel injector 4 harness is open or shorted
Fuel injector 4 circuit poor electrical connection
Ignition coil 4 harness is open or shorted
Ignition coil 4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4.


p0102 = Mass or Volume Air Flow Circuit Low Input

Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner.
Reset code and drive vehicle.
If the code comes back, it may be necessary to replaced the mass air flow sensor.


p0154 = O2 Sensor Circuit No Activity Detected Sensor 1 Bank 2

Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 harness is open or shorted
Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.


p0113 = Intake Air Temperature Sensor Circuit High

Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.



Hope this helps
FYT

http://www.autocodes.com/make/nissan

Mar 26, 2017 | Nissan Cars & Trucks

1 Answer

My 2006 ford fusion sel v6 is having cylinder misfiring problems the codes it reads out are p0171 p0304 p0305 p0306 and p0300


p0171 is fuel injection system too lean - bank 1
possible causes
- Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection
p0304 is cylinder 4 misfire detected.
possible causes
Faulty spark plug 4 - Clogged or faulty fuel injector 4 - Faulty ignition coil 4 - Fuel injector 4 harness is open or shorted - Fuel injector 4 circuit poor electrical connection - Ignition coil 4 harness is open or shorted - Ignition coil 4 circuit poor electrical connection - Insufficient cylinder 4 compression - Incorrect fuel pressure - Intake air leak
p0305 is same as above but cylinder 5.
p0306 is same as above but cylinder 6.
p0300 is random misfire detected
possible cause
Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure

Oct 31, 2016 | 2006 Ford Fusion SEL

2 Answers

99 rx 300 I have trouble codes p0300, p0301, p0303, p0305, po172, and p0171.Stomped


codes p 0300 through refer to misfires on each cylinder with the end number ( 301 is no 1 cylinder , 302 is no 2 cylinder ans so on)=== causes --engine mechanical fault , ---wiring---ignition/ fuel ---injector/s---ECT/ MAF sensor/s ---ECM
most misfires are from injector faults like dirty/blocked tips, low fuel pressure , no pulse or problem pulse from ECM rather than plugs and wires and coils
codes p0171 refers to system to lean bank 1===causes ---intake exhaust leak---air system---maf/vaf sensors ---fuel pressure / pump---injectors ---heated oxygen sensor ( HO2S)
code p 0172 is system to rich-====causes ---intake blocked ---EVAP cannister purge valve ---fuel pressure --EGR system---injector/s ---HO2S
couple these two codes with the misfire codes , I suggest you look at the injectors, fuel pressure (too low) from EVAP problem not venting tank, fuel pressure regulator, EGR system

Aug 17, 2016 | Cars & Trucks

3 Answers

What am I doing wrong? Cylinder 2 misfire will not go away. Tried everything. Even stumped a mechanic.


have a compression test done and look for a moving valve seat insert
it gives the knock, misfire
as it is no 2 cylinder it is mechanical because you have moved the injectors and coils , plugs and leads and it stays at no 2 cylinder
If you want clean engine oil then change the synthetic oil out and put in diesel oil 20w40
It will not harm the engine as it is the same as petrol oil but with more additives than petrol oil
it is cheaper and has heavy detergent properties that keeps the engine internals clean
from the gunk in the sump ,it is clear that changing engine oil on a regular basis is something you don't do but if you want a reliable long lasting engine , it is must do number 1

Oct 22, 2015 | Cars & Trucks

2 Answers

P0302 cylinder 2 misfire detected


the problem is a sparkplug or wire you must be replaced

Apr 22, 2014 | 1999 Toyota 4Runner

1 Answer

Po104po105po1o6 misfires


First the po 171 is that bank 1 is running lean, as far as the codes po104-106, i think you made a mistake, the mifire codes for cylinders 4-6 would be po304, po305 and po306. the fiurst thing to check would the fuel preasure.

The reason i say fuel pressure is due to the misfiring and lean codes.
If the fuel pressure tests okay then check for intake manifold gasket leak, this is done with a smoke machine or with some throtle body cleaner spray. you will neeed to start the engine and spary around the intake gasket area as you watch for engine speed change.
A scan tool may be needed to watch fuel trim and o2 readings if the intake leak is small.
The other problem could be sparkplug failure or bad coil and last sparkplug wires if this is not a coil on plug system.
Acoil on plug system would be a system with out sparkplug wires going to each sparkplug, instead there is a separte coil on each sparkplug.
If this is a coil on plug ignition system i would start there and swap coils with the other cylinders and see if the misfire moves to those cylinder if it does then bad coils. hope this is helpful , good day

Mar 03, 2012 | 1998 Ford Explorer

1 Answer

2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

Jan 17, 2011 | Hyundai Sonata Cars & Trucks

4 Answers

My engine light came on. I went to Autozone to get a reading. It read PO301 3rd cynlinder misfire. So I put new plugs and wires. The engine light never went off. I re check the plugs and wires. But I kept...


Low compression can be caused by different things. And NO YOU DON'T need a new engine yet. You need to take the car to a repair shop that you trust and have them do more tests. A bad Valve will cause low compression and thats a lot cheaper than a whole new engine. A bad head gasket can cause low compression and that's cheaper than a new engine. You need to have the repair shop do what's called a "leak down" test. This is where the cylinders are pressurized one at a time and if they are losing pressure, the mechanic can pretty much tell you the problem. For example if air is coming out the exhaust, then the exhaust valve has failed, and if air is coming out of the intake, the the intake valve has failed. If it bubbles out of the radiator then the head gasket has most likely failed. Take it in and let me know..

Jan 15, 2011 | 2006 Dodge Stratus

1 Answer

Code p306 misfire on injector 6


Random misfires are usually caused by a leaking vaccum pipe, and will only be apparent at idle and sometimes at low engine speeds under part throttle.
Isolated misfires are usually caused by a faulty injector, coil pack, ignition lead, or low compression.

Well, you're going to have to check the spark plug,  spark plug wire, the coil pack, low compression, and the ignition lead, which only really leaves the injector, or even an intake leak at the offending cylinder. 

Start the engine and then spray intake spray or the like around the intake at the offending cylinder and see if the engine note changes. If it does, then you have an intake leak, otherwise, they need to check the injector in the offending cylinder. 

Good luck and hope this helps. It might just be time for a tune up: new spark plugs and wire or some fuel injector cleaner every fill up for now.

May 05, 2009 | 1998 Oldsmobile Eighty Eight

1 Answer

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...


There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
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.

Dec 07, 2008 | 1999 Toyota Camry

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