What does it mean if cylinder 2 and 6 are not firing and it is not the plug, plug wire, or coil because they have all been changed.
The van was really missing bad, would not pull hills unless you gained speed first. If you got over 60-70 miles per hour if will almost cut completely out. We put the hand held computer tester on the van an code came up as miss fire on #2. We changes the plug and plug wire, cleared code and ran code reader again. then code came up as miss fire on #2 and #6 cylinder. We have changed the plugs, plug wires, and the coil. what else could it be.,
My car has 227000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hello. If the misfires are continuing to occur and the ignition parts are good then it may be a faulty fuel injector or an issue within the engine. I usually do a compression test first. By doing this I would know if the problem was internal such as a valve seat failure. If the compression test comes back fine then I test the injectors on those cylinder to make sure that are fine. If those happen to be good also then there is more than likely a problem within the circuit that is causing this and further diagnosis will need to be dine. If you need to have this misfire fixed, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
The P0302 error code indicates that cylinder two is misfiring and not receiving enough spark to its spark plug.
Chrysler P0300 indicates that two or more cylinders are experiencing misfires.
The P0300 engine code indicates a misfiring cylinder problem in your vehicle. The misfiring happens when insufficient fuel is burned or when the spark plug gets damaged.
The majority of the time, a misfire is caused by a faulty spark plug or another problem with the spark system, but it may also be due to: A fuel delivery problem. A mechanical engine failure. Exhaust gas recirculating.
What the P0203 code means. The P0203 is a diagnostic trouble code that is set when the engine control module (ECM) has detected a fault in the injector circuit for cylinder 3.
The most common and relevant cause of a P0300 code is spark plugs that are damaged or worn. This is also a common cause among additional codes displayed as P030X. Spark plugs are devices that ignite the compressed mixture of air and fuel in each cylinder of an internal combustion engine.
Various factors, including defective spark plugs and insufficient engine compression, can cause misfires.
A blinking Check Engine Light indicates a more serious misfiring problem. The P0302 trouble code is an indication that cylinder 2 is misfiring and is not getting the necessary spark to its spark plug.
To find the cause of a misfire, start with checking for trouble codes in the onboard diagnostics system with a scan tool. The codes may not pinpoint a specific part, but they should identify the cylinder or cylinders that are misfiring as well as other systems that aren`t functioning properly.
If it varies beyond 2 percent, the Monitor will set a P0302 code and illuminate the Check Engine Light. If there is more than a 10 percent variance, the Check Engine Light will blink or pulse in a steady manner to indicate that a harmful Catalytic Converter misfire is occurring.
P0200 is a diagnostic trouble code (DTC) for “Injector Circuit Malfunction”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
The code is usually located on the injector head. DENSO Common Rail injectors – generally all require coding, although some very early versions may not. A typical code length is 16-24 alphanumeric characters depending on the vehicle make. The code is usually found on the injector connector.
Yes. While the damage may seem small initially, the longer you drive with a bad oxygen sensor, the worse the damage will become. Eventually, you may experience rough idling, poor acceleration, engine misfires, an illuminated check engine light, and failed emission tests.
There are a few things that can cause this such as a dirty fuel filter, or a worn-out fuel pump. It`s easier to diagnose than a vacuum leak, so many mechanics start here.
Diagnostic Trouble Code P0300 can set if you have faulty spark plugs, low compression, damage or excessive wear of spark plug wires and/or coils, faulty fuel injectors, clogged EGR valves or tubes, burned valves, improper ignition timing, vacuum leaks, leaking head gasket, faulty camshaft sensor, faulty crankshaft …
The catalytic converter may certainly cause the P0300 random misfire code to show up due to the inability for the exhaust to properly breathe, which can cause un-burnt exhaust gases to reignite inside the catalytic converter. A clogged or failing catalytic converter can cause the vehicle to have poor fuel economy.
The P0301 code means that cylinder 1 has a misfire and isn`t burning fuel properly. Bearing in mind that you need air, fuel and spark for combustion, the cause of a P0301 code could come from a few different sources. In any event, a P0301 code is serious and shouldn`t be put off.
Worn or fouled spark plugs are one of the most common causes of engine misfires. These small but crucial components deliver the spark that ignites the fuel in your engine. If they`re not working properly, your engine won`t be firing on all cylinders.
All input and output engine management devices (i.e., sensors, ignition coil packs, etc.) are connected via electrical circuits. Problems within these circuits, such as damaged wiring or a loose connection, can cause engine misfires.
Misfires don`t simply go away – they need to be addressed immediately. Even if they don`t get worse, they certainly won`t get any better unless you take the car to a mechanic.
Any raw fuel in the catalytic converters quickly overheats them and leads to their destruction. If misfires occur severely then damage occurs quickly. If misfires are subtle, then damage may not occur for a year or two.
If left untreated, a cylinder misfire can lead to significant engine damage. Worse, if you experience a bad misfire while driving, it could result in an accident. This is why it`s important to treat engine misfires as soon as you detect them.
A common emissions code seen in the field, a P0420 trouble code indicates that the catalytic converter isn`t functioning efficiently.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
What does it mean if cylinder 2 and 6 are not firing and it is not the plug, plug wire, or coil because they have all been changed.
ANSWER : Hello. If the misfires are continuing to occur and the ignition parts are good then it may be a faulty fuel injector or an issue within the engine. I usually do a compression test first. By doing this I would know if the problem was internal such as a valve seat failure. If the compression test comes back fine then I test the injectors on those cylinder to make sure that are fine. If those happen to be good also then there is more than likely a problem within the circuit that is causing this and further diagnosis will need to be dine. If you need to have this misfire fixed, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.
I have a engine miss codes po174 po420 are on now I had code multiple cylinder miss fire. I changed spark plug wires and plugs l
ANSWER : Hi there. Your issue might be caused by a faulty O2 sensor. You might want to read this article about the P0174 OBD-II trouble code as it will show you possible causes, symptoms and solutions to resolve the problems.
Plug wire attached to the distributor cap are arcing from the wire to the distributor cap.
ANSWER : Hi there. The spark plug wire is arcing for there is a least path of resistance on the distributor cap. There could be a crack in the cap, but most of the time the spark occurs due to lack of connection. Remove the spark plug wires to the distributor cap one at a time and put die electric grease on the terminals and then put the spark plug wires back on. Allow the one hour for the die electric grease to seal up tight. This will prevent the wires from shorting to the distributor cap. Also, remove the distributor cap and check the terminals on the cap and on the rotor. Use sand paper to clean up the corrosion that is present on the parts. Put the distributor cap back on and recheck for any sparking. If the sparking continues, then either the cap has a crack on it or the terminals have too much corrosion causing an arc. If you need further assistance with your distributor cap arcing, then seek out a professional, such as one from Your Mechanic, to help you.
Check engine light rough then goes away code cylinder 2 misfire changed plugs wires and cylinder 2 coil driving me nuts
ANSWER : The only things left to check is compression and the condition of the injector if you have changed the plug, wire, and coil. I would go with having the injectors cleaned. It is more likely that you have a clogged injector versus an internal cylinder problem causing low compression.
Clean the injectors by using a professional cleaning machine. Afterwards, clear the codes and use fuel tank injector cleaner to help keep the injectors clean. If you need some assistance with this, contact a certified technician who will be able to diagnose your Check Engine Light firsthand and perform the necessary repairs to your car.
Spark plug chaos. Rubber stoppers are preventing the spark plugs from coming out.
ANSWER : Hi there. Try using a pair of small needle nose pliers to pull off the rubber boots from the spark plugs. As you pull, twist the rubber boots to break them free. If you cannot get the rubber boots off, then try using some mineral oil on the boots to aid them off, then clean off the oil with soap and water with degreaser. If you need further assistance with removing the boots from the spark plugs, then seek out a professional, such as one from Your Mechanic, to help you.
Random misfire – 2004 Chevy Express 2500
ANSWER : Hello. Most of the time if you have a multiple cylinder misfire such as this, it is caused by a fuel system problem. If the fuel pressure is low, then this will occur. If the fuel pressure is fine, then I would also check the signal from the crank sensor as a failing crank sensor can cause this. If that is fine also then I would suspect that there is an electrical issue in the circuit on that one side of the engine. If you want to have this checked out, consider YourMechanic, as a certified technician can come to your home or office to diagnose the misfire and follow through with correct repairs.
2013 CR-V EX-L. P0304 code. It is not the spark plugs or the coils. One of the wires of the connector to the 4th coil is open.
ANSWER : I would suggest going online and getting a wiring diagram for your vehicle. Most of the time, the coil wires will trace back to the control module. You can do a continuity, or resistance, test to figure out where the wire is broken, or what is causing the problem. I would suggest putting one probe on the connector and just start tracing the wire back until you find the break/short. Keep in mind, that if the wiring checks out, it is possible that there could be a problem with the control module itself. If this is something that you feel you could use a hand with diagnosing/repairing, contact a certified mechanic, like the mobile mechanics available at YourMechanic.com.
1998 f150 5.4, sputters when passing or anytime getting down on the gas. Replaced 2 bad coil packs and changed plugs. Did notice t
ANSWER : On the Ford, if the plug was wet but did not smell like anything, this may be due to oil getting on the plugs. Have a compression test done on the cylinders to make sure you have good compression, and then have the injectors cleaned to make sure they are in good condition.
On the Nissan, you would need to supply the codes to help with a diagnosis. A misfire on these may be anything from shorted wires in the spark plug hole to oil leaking from the valve cover shorting the wires. Remove coils and see if they have oil on them. Replace the spark plugs, coil boots, and the valve cover gasket. You may want to check a fuel sample to see if you got water in the fuel if you happen to get fuel at the same gas station. Water on the plugs would also not have a smell. If you would like to have this checked, consider having a certified technician from YourMechanic, inspect the sputtering issue to have this addressed appropriately.
