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
I have.a engine miss I have codes po174 and po420 now. I had code first said multiple cylinder miss fire I changed coil unit didn't get better changed plug wires and spark plugs.
My car has 252000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
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.
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The P0302 error code indicates that cylinder two is misfiring and not receiving enough spark to its spark plug.
What the P0304 code means. The P0304 code will be seen in cars where the ECU has detected that cylinder 4 is not firing properly. The ECU monitors the operation of all cylinders to ensure they are all firing on time, so when one misfires repeatedly, a Check Engine Light is set.
P0302 definition: Cylinder 2 misfire detected. Diagnosis: A multiple misfire can be caused by anything from faulty spark plugs to low engine compression.
Multiple reasons could trigger a code P0302 misfire, including a faulty spark plug, a bad ignition system, or a defective fuel injector.
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.
While error code P0304 indicates a misfiring cylinder, the root cause can be many. Your car`s ECM may trigger this trouble code due to a faulty fuel injector, a leaking intake gasket, or low fuel pressure, among other things.
A misfire typically occurs when the timing of this ignition is off. Ford Ranger P0300 indicates that two or more cylinders are experiencing misfires.
The two Diagnostic Trouble Codes, P0304 and P0302, refer to cylinder misfiring. A faulty ignition coil, spark plug, wire, and so forth can cause a cylinder to misfire but there are other possible causes, too.
P0302 – How To Repair: Meaning, Causes, Symptoms, Fixes
“3” in the third character position in a DTC indicates that the ignition system or misfire is experiencing a malfunction. The last two characters “02” is DTC number. OBD2 Diagnostic Trouble Code P0302 means that Cylinder 2 Misfire Detected has been detected.
The two Diagnostic Trouble Codes, P0304 and P0302, refer to cylinder misfiring. A faulty ignition coil, spark plug, wire, and so forth can cause a cylinder to misfire but there are other possible causes, too.
The two Diagnostic Trouble Codes, P0304 and P0302, refer to cylinder misfiring. A faulty ignition coil, spark plug, wire, and so forth can cause a cylinder to misfire but there are other possible causes, too.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
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.
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.
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.
Engine will not stay started. I have replaced idle control valve map sensor spark plugs spark plug wires no check engine light is
ANSWER : You have a problem with the distributor assembly. I recommend replacing the distributor assembly. This will replace all the possible sensors and coil for the ignition and fix the problem you have.
Does anyone know the spark plug firing order for a 1992 Ford Ranger 3.0 V6? Changed out my spark plug wires, starts wants to die.
ANSWER : Hi there. Here is some info for you to review. 1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6 – 1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6.
Just replaced spark plugs and wires and my car is still miss firing and I can’t pin point why and my old spark plug is oil covered
ANSWER : Hello there, many faults will cause your 1988 Ford Contour to have a misfire even after the spark plugs were replaced. When oil is seen on the spark plug this indicates that the valve cover is leaking onto the plugs. When this happens it fouls the plugs and can cause a misfire. Until the oil leak is addressed the spark plugs will continue to become fouled. If the misfire persists there are many potential causes such as the plug wires, fuel pump, vacuum leak, oxygen sensor, MAF sensor, or the cap & rotor. A qualified Technician such as one from YourMechanic will be able to diagnose your misfire fault and make any repairs required to resolve the issue.
engine light-p303 cylinder 3 misfire, changed spark plugs,ingition coil and cylinder valves
ANSWER : Coils and plugs are usually the starting point for a misfire code, but some basic diagnostic work might save you some money. Sometimes I like to try swapping components from cylinder to cylinder to see if the misfire moves before buying expensive parts. There are a few other problems that could lead to a P0303, like ignition primary problems, vacuum leaks, or bad injectors, but those things are usually accompanied by other codes. It’s clear that you have a dead miss. When the ECU sees a consistent misfire, it shuts off the fuel to that cylinder to prevent damage to the catalyst. The the CEL will start blinking to warn you that you may be doing damage by continuing to drive. You’re at a point where you need to have a professional do some diagnostic work. by contacting Your Mechanic, you can have a technician come to your home or office to check out your misfiring VW and recommend a fix.
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.
