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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 most common causes of engine misfires are: worn spark plugs, weak fuel injector, vacuum leak,...
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
I put 44k in my gas tank and it helped a little but I can still feel some vibration.
If you have a cylinder with low compression, the problem may be much deeper than carbon build up. Carbon build up may cause valves to stick which can cause low compression, but it is more likely a stuck or burned...
Question
Have already changed plugs, plug wires, and ignition coils, but the engine still wants to stall and shake a lot.
You may need to have you crankshaft position sensor relearned or have the sensor replaced. Also the catalytic converter could be partially clogged. If everything is working properly, then it is possible that some intake bolts could have...
Question
P0302 2003 Pontiac Aztek
Hi there - if I'm reading your notes correctly, you "checked" the plugs and wires, but did not replace them. For your mileage, you need to replace the spark plugs at least, and possibly the plug wires as well. Misfiring...
Question
Misfiring, and we have been told the coil pack has given up. Bought 3 aftermarkets which aren't even letting it run 2012 Sonic 1.6L
Hi there - the coil packs on this model have a design issue, and use of OEM parts, and great care in installation is required. I recommend a engine misfire inspection performed by a mobile, professional mechanic, such as one...
Question
O2 sensors changed, but check engine light still showing code after clearing it I checked fuse. Wires are good and used Denso OE.
Depending on what the code was for will determine if the oxygen sensor was to be replaced. If the conditions were for a rich or lean mixture and it said oxygen sensor, then the spark plugs and wires could need...
Question
Engine light blinking and the oil light come on. Accelerates slow but when you get to about 30 mph it smooth out. Then when you slow down it start shake.
For the cylinder that has excessive oil in it, the oil is either coming in for the piston rings being worn or the valve guide is leaking on the intake valve causing the engine to consume the oil. If the...
Question
Honda Civic 2008 after replace blown head gasket car take long to start
If vehicle is hard to start after the engine head was removed then you may need to double check the timing of the timing belt was set correct and the engine has no codes for the cam sensor set because...
Question
The Check Engine light flashes when I go to give it bunch gas and feels like it misfires 2002 Chevrolet Silverado 1500
Hello - first task is to retrieve whatever problem codes are tripping the Check Engine light. Most auto parts stores will do that for you for free. Without that info, I suspect you have a weak spark plug or ignition...
Question
Do a axle make a 2005 crown Vic skip
The problem sounds like you have a misfire in the engine. You should have the engine computer scanned for codes for the jerking and misfire. You may have a failed spark plug or ignition plug wire or coil. Have a...
Question
My sl600 V12 has 161,000 miles. Do I need to replace the ignition wires?
If you suspect that the engine is misfiring, you should identify and resolve the cause now because misfiring can cause lots of collateral damage such as plugging up the catalytic converter. Misfiring also wastes lots of gas, has the potential...
Question
My car jerk's some times one week is good and the other week is bad.
Either the EGR - Exhaust Gas Recirculation - has been plugged up or the MAF - Mass Air Flow - sensor is dirty or damaged. Try removing the vacuum line to the EGR and test driving the vehicle with the...
Question
Idles fine in park But won't rev above 2,000 rpm and won't go over 30 mph. 1988 Pontiac Grand Prix
Hello. This can be caused by a number of things. I usually start by doing a compression test on the engine first. If the compression is low then the engine may be worn or it may need a timing chain....
Question
Check engine light flashes on then turns off what does that mean?
A flashing check engine light usually refers to cylinder misfiring. Misfiring should be investigated and resolved promptly - that's why the light flashes versus simply staying steady - because misfiring can damage the catalytic converter which can result in additional...
Question
2009 gmc acadia..car starts but when you put it in drive it cuts off
Hello, thank you for writing in. To begin, there are several recalls and issues known to happen with the Acadia within your year range. If you have not already looked up your VIN to see if your vehicle was part...
Question
Car misfires then goes to limp mode.
When the vehicle goes into limp mode when the engine misfires, the computer is shutting down the electronics to the transmission to prevent damage to the catalytic converter as the fuel condition is either too lean or too rich. Check...
Question
1996 Jeep Grand Cherokee with 180,000 miles. As I'm driving it starts to sputter but still going the speed limit.
Sounds like the crankshaft position sensor is loosing connection when driving. Check the harness to the crankshaft position sensor and see if there is a loose wires or if the contacts can be loose when pushed against. The harness could...
Question
GM Dealer cleaned injectors and caused P300 Code? Buick Ranier
Hello - this seems unlikely, but sometimes cause-and-effect are not obvious. The answer to this question would be helpful: "Was the car misfiring or otherwise running badly before the "injector cleaning"? Was the Check Engine light on, and if so,...
Question
What causes Cylinder misfire? Spark plugs, wires and coil pack already replaced 2005 Dodge Stratus
Hello - in addition to the components which deliver spark on command (which you have already replaced), are the components which determine when the spark should be delivered (crankshaft and camshaft position sensors). A bad fuel mixture will cause misfire...
Question
Rough in morning. 0 compression. after heats up runs okay to 100 compression. in 3 cylinders only on a Miata 2004.
Your engine has morning sickness. There is no way for the engine to have a 0 compression as the engine would not start, so there has to be at least 60 pounds of compression to ignite the fuel. The issue...
Question
My Lincoln ls 2004 has 9 codes at onece
Hi there. Your vehicle is in a lean mixture state. The fuel system is not supplying enough fuel to the engine. Check the fuel pump to see if its working by putting on a fuel pressure hose on the fuel...

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