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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
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
Can bad U joints cause engine vibration
Hello, thank you for writing in. The misfire is likely the cause of the vibrations you are feeling. When just one cylinder is having a misfire, you may have a bad spark plug, a weak spark due to a failing...
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
My radiator fan is shaking and rattling.
Hello, thank you for writing in. The fans can cause the vehicle to shake and vibrate. If you suspect the problem lies with the fans, start there. Check for any broken fins, extra noises, debris, or other obvious signs of...
Question
Check Engine light is on
Hello, thank you for writing in. The work you have put in thus far is only benefiting your car, but misfires can be a lot trickier than most think. You may be having a low fuel pressure issue, dirty MAF...
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...
Question
Engine shaking
Hello, thank you for writing in. One question that needs answering is what are the plugs wet with? While it is most commonly oil, coolant and fuel an also foul the spark plugs. If fuel is the issue, you need...
Question
Be c.f.. Shaking and check engine light on. Not flashing. Just had plugs and coils done. Rpms erratic.
You need to scan the computer to get the stored codes and let us know the codes received since there may be many possible codes pertaining to this problem. You may have a problem with a particular coil wires from...
Question
My car misfires when it's cold al so idling rough
Hello, thank you for writing in. The vehicle may be having one of several issues including clogged fuel injectors, poor compression (metal expands when hot), any of your air intake sensors, or a vacuum leak. The valves and lifters can...
Question
Hey I have a chrysler300 2009 touring I have a p0301 and wen my car runs for a while it won't crank back up till it cools down
Hello, thank you for writing in. The vehicle's cooling leak may be causing the misfire. The leak needs to be repaired first, and then we can take any other issues from there. The starting problem may also be the vehicle's...
Question
My car has been sitting for 5 months, it starts but when I drive it it sputters and stalls, why is that?
You may need to add fresh fuel and then see if it runs better. If engine misfires then you may have fouled plugs and or bad coils. have computer tested for misfire codes to isolate the cylinder that is misfiring....
Question
Cylinder 4 misfire code P0304
You should recheck computer to see if same code is coming up P0304? If it is then check plug wire to see if it has oil on it from a leaking valve cover gasket getting oil on plug wire and...
Question
I have a 2006 ranger and recently the car started loosing power and it wouldn't drive check engine light came on and it dia
You will need to have a compression test and ignition test on the three cylinders showing misfire. You may have jumped timing or lost compression in those cylinder. A six cylinder engine will not run correctly on three cylinders. Have...
Question
once i turn the car it was shaking and once you drive it it was not accelerating like it should i started to see smoke come out
You should check to see if you are losing coolant since the smoke may be from a blown head gasket leaking coolant into one of the cylinders causing it to misfire. If you are not getting low on coolant then...
Question
96 Ford F150 with a 5.0 it's got a rebuilt motor and transmission I'm having problems with it firing a radically when it cranks
You should check the computer for codes first and address any codes received first. Have the fuel pressure tested to see if the pressure is within specifications and holds the pressure with key off. If problem continues then you may...

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