Q: p0305 Misfire in Cylinder 5

asked by on January 08, 2018

I currently have an error code of P0305. I have already replaced the spark plugs and the one coil on cylinder 5, the misfire is still there. Many people have told that they can smell gas when the car is running. I replaced all in the intake gaskets in hope that there was some kind of leak. I have done a compression test and also have the freeze frame data and it will both be below.

Freeze Frame Fuel System 1 Status: Closed Loop Fuel System 2 Status: Closed Loop Calculated LOAD Value: 32.94% Engine Coolant Temp :174.20 F Short Term Fuel Trim - Bank 1: 14.84% Long Term Fuel Trim - Bank 1: 0.00% Short Term Fuel Trim - Bank 2: 3.13% Long Term Fuel Trim - Bank 2: 0.00% Engine RPM: 700.00 RPM Vehicle Speed Sensor: 0.00 MPH Absolute Throttle Position: 4.31%

Compression Test Piston 1: Dry 160 - Wet 170+ PSI Piston 2: Dry 153 - Wet 170+ PSI Piston 3: Dry 160 - Wet 170+ PSI Piston 4: Dry 155 - Wet 170+ PSI Piston 5: Dry 157 - Wet 170+ PSI Piston 6: Dry 155 - Wet 170+ PSI

My car has 100912 miles.
My car has an automatic transmission.

Engine is misfiring Inspection $79.99 - $89.99 Get a Quote

The fuel injector could be faulty and/or plugged and that would explain the high short term fuel trim on Bank 1 which contains cylinder No. 5. Another possibility is a vacuum leak around the intake to that one cylinder. If so, that can cause a random misfire. If the lobes on the camshaft are worn, that can cause a misfire and other inefficiencies as well. I would first check for a vacuum leak. If no leak, secondary firing patterns on the misfiring cylinder should be examined on an oscilloscope. The waveform will help narrow the potential causes to fuel versus ignition. Another possibility is the random misfire is due to intermittent faults in the injector and/or ignition components so although these components appear to be in spec during static testing, in fact they are not reliable and are later, in service, operating intermittently. Finally, the ignition and fuel driver circuits in the PCM for the misfiring cylinder could be faulty; that is the absolute last thing to test though unless you happen to have handy a known good PCM that you can substitute. If none of these possibilities pan out, you can request a misfiring diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

i just replaced the camshaft timing senser bank 1 but it still does not have power when excellerating.

Hi there. The warning light and error code that indicates a camshaft timing sensor error is not always caused by the sensor itself. In fact, more often than not, the problem is with the electrical harness that connects the sensor...

Car shaking and making noise.

Not being able to hear the noise, it is hard to make an accurate determination as to the cause, but if it is a creaking noise while turning the wheel it could be a worn steering rack or tire rod....

Rattle by strut bar

Hi there. If you are hearing a rattle from the rear passenger side of the vehicle, then there may be a problem with the suspension. Rattling noises can often be caused by blown shocks, or worn/damaged suspension components, such as...

About how many hours does it take to change a timing belt on a 2005 Acura MDX? I'm just trying to figure out how much the labor is

Claimed by Tim Charlet

do you know how long it would take to replace an oxygen sensor in a 2005 nissan murano?

Hello. We'll be happy to assist you. The labor time will depend on which oxygen sensor you need replaced. There are four different oxygen sensors on your vehicle. There are two upstream and two downstream oxygen sensors. We will have...

How do I use the windshield wipers?

The windshield wipers provide visibility when you are driving in wet weather. To turn on the windshield wipers, pull the wiper lever (located on the right side of the steering column) down. If the lever is lowered to the first...

Car vibrating under acceleration

There are many things that can cause a vibration like what you are describing. Rotating parts that are off balance for some reason are usually the issue. Since a car has many rotating parts, it is usually best to seek...

Why would a new bettery be corroding so much already?

First thing to check is to see if all the corrosion was removed and neutralized on the battery clamp and cable. The have the charging performance tested to see it the alternator is not overcharging and causing the battery to...

I have switched the iss and the oss and it still has problems what els can it be?

I need more detail on your problem, but it sounds like you are having transmission concerns. If the input and output shaft speeds are not correct and the transmission control module is throwing codes, you may have an internal transmission...

Related articles

The Best Used Cars to Buy If You're a Gardener or Landscape Architect
Gardeners Gardeners and landscape architects need to haul around quite a bit of gear. As a gardener, chances are you will need to transport a variety of mowing equipment, along with smaller implements. You may also need to move shrubs,...
A Buyer's Guide to the 2012 Nissan Quest
If If your family has gotten to the size where a minivan makes sense, you have a huge market to explore. Start with the 2012 Nissan Quest, though, and you may find that your search becomes a relatively short one....
A Buyer’s Guide to the 2012 Nissan Rogue
While While the Honda CR-V and the Toyota RAV4 generally get the most attention in the crossover utility vehicle (CUV) class, buyers should take a look at the 2012 Nissan Rogue. The second-smallest model in Nissan’s line of SUVs and...