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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,...
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
There’s one little yellow light that strikes fear in the heart of every driver. It casts a shadow of doubt over your whole vehicle. Will this be something straightforward or will the...

Related questions

Car is randomly misfiring
There are a number of things that may cause this such as a faulty or dirty mass air flow sensor, a potentially a bad idle air control valve, or dirty fuel injectors. The mass air flow sensor is a unit...
Car spits an sputters like it's misfiring if I accelerate too fast. But does fine any other time
Hey there. The first thing I would check would be the fuel pressure. But there are several possible causes for this condition. There could be a vacuum leak, the engine may need a tune up, or any number of other...
I replaced 2 spark plugs in cylinder 5 to fix a misfire.
Leaking valve covers on this engine allow oil down into the spark plug recesses as you note. Besides shorting the plug, the oil degrades the boot portion of the coil which plugs onto the spark plug, creating other opportunities for...
What are the effects or symptoms of bad fuel injectors?
Hello. A bad fuel injector can fail closed, fail open or not seal when closed and can work normal but have reduced flow from blockage. A fuel injector that is failed closed will cause total misfire all the time on...
Cylinder 4 misfire
It sounds like you may need an ignition control module. It's a small device mounted around the right front of the engine compartment. It has a plug with about a dozen wires connected. The module has a separate channel for...
My Dodge Neon is misfiring on cylinder #4. The Check Engine Light is on, code is P0304.
A misfire can can also be caused by a vacuum leak, a wiring problem, a faulty fuel injector, a bad electrical connector, or any number of other causes. It would be best to pull the codes that are causing the...
Engine shake when started and oil pressure gauge dropped to zero.
Hi there - nice ride! I would first get the oil level back up to "Full". hopefully this was less than a quart low. I would also get a real gauge on the oil pressure to know precisely what oil...
An intermittent misfire has triggered several trouble codes
Hi and thanks for your question. The codes P0201, P0203, P0204, P0205, P0206 are the cylinders that are not working. Your vehicle is only running on three cylinders that have fuel and possible fuel with the other cylinders at random...
I installed a new crankshaft positioning sensor, now I'm getting misfires and code P0300. Is this supposed to happen?
Assuming you replaced your vehicle's crankshaft position sensor for a P0335 trouble code and that code has not returned, this leads me to believe that the new sensor is either faulty or misadjusted. The sensor replacement should not have caused...
Engine shakes after 10psi.
Check for problem codes anyway, even if the Check Engine light is not illuminated. There may be a transient code for a misfire. I would suspect that either the plugs or coils are failing under load, and need to be...
Is it bad to drive a car with a bad throttle body??
Hey there. This may not immediately affect your car's engine. However, it will continue to cause intermittent misfires and will gradually get worse. This may also have an impact on other parts as well since the missing cylinder will still...
If cylinder 3 misfires is that a bad thing?
Hi there. A misfiring cylinder can be expensive if allowed to continue. The catalytic converter can be damaged. If the cylinder is misfiring, the coil, wire, and/or spark plug could be the cause. First swap the spark plug between cylinder...
Car is misfiring and has a lack of power
It is very difficult to definitively say what the issue is. Have you had the vehicle scanned for diagnostic troubleshooting codes? If not, you should start there. Due to your vehicle being pre-1996, the method of receiving codes will be...
Can anyone tell me if the half moon metal part inside of the distributor, that the cam sensor reads off of, is supposed to have an
Hello. Although you have done considerable work on the fuel system, it may be a good idea to check the fuel pressure coming from the fuel rail. This will determine if the fuel pressure regulator is working efficiently, which may...
Car cut off file injectors miss fire after driving 46mi.
Hi there. You will want to start by testing the fuel injector that has tested bad. This can be done using a multimeter. If the resistance of the injector is out of specifications, you will want to replace it. If...
I missed a shift from 3d to 4th and over-revved the engine. There is now a misfire in every cylinder.
Unfortunately, this could mean you have bent some valves. The best test for this is to put air pressure into each cylinder and see where it leaks from. You can utilize an expensive leak down tester or simply modify a...
Engine is misfiring and Check Engine Light is on - 2002 Toyota Tacoma
Hello. A flashing Check Engine Light is a sign that the computer has detected an issue that could potentially damage the vehicle's emissions components. I would recommend scanning the trouble codes when the light is flashing in order to determine...
Misfire under acceleration
First I would revisit the plugs and coils. there is always the possibility that something didn't hook up properly. Pay close attention to the ground wires. They are the brown wires that emerge from the harness at seeming random places...
Engine acts like it misfires occasionally during regular driving or while giving it gas - 2002 Ford Mustang
Hello there, intermittent misfires can have many different causes on your 2002 Ford Mustang. The most common cause is the spark plugs, so it is good those where replaced first. Other potential causes would be a fuel injector, coil, vacuum...
Slight misfire
Hi there. From the description you have given, the slight misfire could be caused by worn or fouled spark plugs. The slight misfire is apparently not being recognized by the vehicle's computer (the check engine light would flash and then...

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