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Misfire

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Symptoms of a Bad or Failing Ignition Cable
Common signs include a decrease in power, acceleration, and fuel efficiency, the Check Engine Light coming on, and visible damage to the cables.
Symptoms of a Bad or Failing Ignition Coil
Common signs include the Check Engine Light coming on, engine misfiring, rough idle, a reduction in power, and the car not starting.
How Long Does a Top Dead Center (TDC) Sensor Last?
The top dead center (TDC) sensor is the point from which the firing order is determined and the ignition system measurements are taken. The measurements are normally defined as before...
How Long Does an Oil Cooler Last?
The heat that the engine produces can produce a lot of damage in the right situation. Making sure that all of the systems on a car that reduce the heat of the...
Is it Safe to Drive With a Misfiring Engine?
Repairing a misfiring engine can be simple or complicated, depending on the reason it is misfiring. The...
Symptoms of a Bad or Failing Timing Belt
Common signs include a ticking noise coming from the engine, an engine that won't turn over, engine misfires, and oil leaking in front of the motor.
Symptoms of Bad or Failing Spark Plugs
Common signs of faulty spark plugs include slow acceleration, loss of power, poor fuel economy, engine misfires, and difficulty starting the car.
Symptoms of a Bad or Failing Fuel Pump
Common signs include a whining noise, hard starting, engine performance issues, and an inability to start the car.
Symptoms of a Bad or Failing Timing Chain
Common signs of a faulty timing chain include engine misfires, metal shavings found in the oil, and rattling sounds from the engine while idling.
Is it Safe to Drive With a Misfiring Cylinder?
An engine misfire can be caused by bad spark plugs or imbalanced air/fuel mixture. Driving with a misfire isn't safe and can damage your engine.
Symptoms of a Bad or Failing Valve Cover Gasket
Common signs of a faulty gasket include a burning oil smell, dirty valve cover, oil leaks, low engine oil, and a rough-running engine that misfires.
How Can Problems with the Ignition System Cause Misfiring?
Misfires are never good, and they're always a sign that there’s a problem with the engine that needs to be repaired. The problem won’t “go away on its own” and waiting too long...
Why Misfires are Often Misdiagnosed
Properly diagnosing a misfire can be a challenge, as a variety of symptoms can cause it, or a different problem could be present.
The Check Engine Light Demystified
Your car Check Engine Light can mean many things. The Check Engine Light comes on when there's an electrical or mechanical problem with your car.

Related questions

Question
car shakes when i start it in the morning, check engine light blinks then stays on
If you have the engine computer scanned you most likely have a misfire code to one or more cylinders. You may have a bad plug wire or coil or spark plug. If you have not got a tune up then...
Question
Continuous misfire of cylinder 2
Cylinder compression in all four cylinders should be verified. Secondary firing patterns should be scoped to get independent verification (i.e., apart from what the OBD-II system might be reporting) that indeed the problem is just in cylinder no. 2. If...
Question
Misfire on cylinder 2
Compression in cylinder No. 2 should be tested. If compression is within spec, a possibility is an oil leak into cylinder no. 2. With regard to the fuel injector, verify its operation as, although the injector may be new, the...
Question
My Ford f150 has a misfire on #4and#7 I checked the coils and plugs but they seem to be firing what else do I need to do
In order to isolate the cause of the misfire you will need to do an engine compression and leakdown test to make sure the compression is good and no valves are burned. If compression test is good on all cylinders...
Question
Car hiccups or slight jerks at steady rpm
Ignition failures are more common on your car than fuel injector failures, and the mileage would be about right for coil failures. It takes several subsequent misfires for you to be able to notice it on the road, so if...
Question
Should I replace the spark plug boots and coiks when I time up my 2005 sts it has a misfire
The cause of the misfire should be identified first before any parts are replaced. It may have absolutely nothing to do with the ignition system but rather the fuel system or the air induction system. In particular, an attempt should...
Question
What can be causing my car to have OBD2 codes: P0301- P0306 come up on scanner? Could the cooling system cause this?
P0300 codes are all misfire codes. the last digit designates the cylinder where the misfire was detected. In your case P0301 and 306 mean the misfire was detected on cylinders 1 and 6. You probably won't be able to fix...
Question
Was told engine was performing plenty poorly
If you have a valve cover leaking oil onto the spark plugs then it can cause a misfire. This does not mean the leaks are the cause but a possible cause. I would recommend having a mechanic like one from...
Question
Transmission Lurching Issues?
The lurching is not caused by a fault in the transmission. Rather, the misfiring is probably the cause as the engine periodically gains and loses power as the misfiring occurs. Diagnostic Trouble Code P0301 means that Cylinder No. 1 is...
Question
Could l have water in my gas tank if it hesitate to move
It is possible you got some water in your fuel if you noticed the fuel truck was just there refilling the gas station tanks. This mixes up the water in the bottom and you may have got some of it....
Question
RPM goes high while sitting still miss firing 02 Deville I think 4.8
Hi...engine idle speed is controlled by an idle air control valve (IAC). A faulty or blown fuse in other electronically controlled systems can cause the IAC motor to malfunction, leading to a higher than normal engine idle speed. The IAC...
Question
2008 Chrysler 300
An automotive scope should be used to see the actual secondary ignition waveform in that misfiring cylinder. Even new coils and new injectors will not function if the circuit supplying those components has a fault. The other possibility is there...
Question
Why do i keep getting the po300 code after replacin plugs,wire,coil packs and cleaning throttle body. i have checked fuel pressure
P0300 signifies that there are random misfires. Consequently, there is usually a "global" cause and there are quite a few such causes including: fuel injectors that are defective, EGR valves or tubes that are clogged, ignition timing that is off,...
Question
2012 audi a4 quatro, cylinder 2 misfires
The variance in cylinder compression you are reporting exceeds that allowed in the Factory Service Manual. Put oil in the No. 2 cylinder to see if compression rises appreciably and you can then rule in or out leaks past the...
Question
hey Jay. I have a vw jetta 2011 4 cyl. my car has 60,000 miles was driving and felt a slight hesitation when accelerating uphill.
Diagnostic Trouble Code P0303 means that Cylinder No. 3 is misfiring but the causes of that misfiring can be very varied. The other Code that you probably saw, namely P0304, just refers to the same misfiring but it is occurring...
Question
I have a 2006 Hyundai Azera Limited all the cylinder are misfire would this stop the car from starting up?
Hello, thank you for writing in. The vehicle is not starting because of the issue causing the misfire. If not cylinders are firing when they are being told to, there will be no combustion, and the car will not run....
Question
What is the main reason for a random misfire on Audi A6 2002 3.0
Hello, thank you for writing in. Without the codes that are present it is hard to narrow down the possibilities for you. Coil packs and fuel supply are going to be towards the top of the list. You should start...
Question
What are the signs of a misfiring engine? I'm not sure if my car is misfiring or something else.
Misfire can be a very broad term that can describe a variety of symptoms, but as far as the Engine controller is concerned, a misfire occurs when combustion is not taking place when the controller is expecting it. The Controller...
Question
My car was misfiring so i replaced spark plugs coil packs and fuel injectors my cylinder 1 is still misfiring what can it be
Since you were first showing misfire on number 5 cylinder and now you are showing misfire on number 1 cylinder. I have to say you introduced a problem on number one cylinder. I suggest first removing and checking the spark...
Question
I have a 2012 Dodge Charger R/T AWD and I have check engine light issues
Hello, thank you for writing in. The long list of potential issues that cause hard-starts and misfires is profound. Without knowing exactly what diagnostic codes the dealership was pulling from the check engine light, it is impossible to narrow down...

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