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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,...
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
Gas pedal shakes when accelerating fast and misfire code came on?
Hello, thank you for writing in. The most common cause of engine or pedal shake (because you can feel the engine shake in the pedals) is a misfire. With that being said, its not uncommon to feel issues with brakes,...
Question
Misfire on coil one and two
It is possible that the coils were damaged by the bad plugs. The spark output of the coils may be bad on the two cylinders in question. If you want to chance it and only replace the spark plugs then...
Question
Runs rough and misfires
Hello. The trigger system that your codes may be referring to could be the crankshaft or camshaft position sensors. Many engine management systems use these signals as a trigger point for their ignition systems. It could be possible that there...
Question
Problem with the triggering system on the coil ? Can the coil go bad and get out of time on firing? 1996 Mercury Grand Marquis
Hello - no, the coils cannot vary timing, they are responsive to whatever timing trigger is passed to them (crankshaft or camshaft position sensor, ignition control module, distributor, etc.). The coil which services Cyl 5 could be failing however -...
Question
RPM's fluctuate while idling and sometimes it dies. Getting codes for multiple misfires and knock sensor.
Hi there. Check the fuel injectors and see if they are working or not. While the engine is running, unplug one injector harness at a time. If the engine begins to hesitate, then the injector was working. If the engine...
Question
Misfire in cylinder number 8.
Hi there. The issue could be the spark plug not firing on cylinder 8, the fuel injector not atomizing on cylinder 8, or there could be a burned valve or a burned head gasket. Check the spark plug on cylinder...
Question
Misfire after installing AC
Hello. In most cases the AC system should not affect the operation of the engine. If the issues only began after the AC was installed, it may be possible that the issue developed while the AC was being worked on....
Question
My 2002 Ford Expedition is running too lean with misfires.
Hello. It sounds like you may have a few issues going on here. I usually start by checking the codes in the computer myself. This will give me a good idea of what my be going on and what cylinders...
Question
codes p0174, p0302, and p2A03 read on code reader.
Hi there. What is happening is the codes are reading for a misfire on cylinder number 2 and the system is too lean on bank 2. Check the spark plugs and the fuel injector on cylinder 2 to see if...
Question
My car does not move when I accelerate, the engine shakes when it is turned on and in a traffic it shakes sometimes.
Hi there. Check the engine for any misfiring conditions. Check the spark plugs and the fuel injectors and see if they are working properly. See if there is spark to the engine and see if the injectors are firing by...
Question
m y mechanic put a 5.4 3valve reman into my 2007 lincoln navigator.
Hi there. Check the cylinders that are misfiring for fouled out spark plugs or non working injectors. Look at the spark plugs and see if there is any burn marks or corrosion. If there is no signs of wear on...
Question
Engine Stutter On Acceleration
It's likely that If you were to scan the engine controller, (ECU) you would probably find several misfire codes. The misfire codes can indicate specifically which cylinder if malfunctioning. Your model car has a history of coil and ignition module...
Question
I have a 2005 Lincoln navigator that the number 6 spark plug is misfiring on.
Hello. A misfire can be caused by a number of things. Depending on what they found to be the problem it is quite possible that this is an accurate estimate. Most of the time this is caused by a failure...
Question
Rough idle falls on its face any throttle passed half 0p0420 0p0430 0p0300
First off, the P0420 and P0430 both refer to a catalyst efficiency problem, while the P0300 and P0302 codes refer to a misfire problem. If you are certain that the issue is not with the ignition system, then I would...
Question
code po300
Diagnostic Trouble Code P0300 can set due to spark plugs that are damaged or worn; spark plug wires and/or coils that are damaged or worn; fuel injectors that are defective; EGR valves or tubes that are clogged; ignition timing that...
Question
Engine misfiring p0300 code
Hello there, many faults will cause a random misfire in your 2004 Chevrolet Classic. Replacing the spark plugs is the first step so it's great you have taken care of that already. A few other faults will cause cause a...
Question
My engine is about to kill itself.
If the vehicle transmission has entered limp mode and the engine is really misfiring, these faults have to be diagnosed separately. The engine misfiring should be dealt with first. Typically, the engine is scoped to look at secondary firing patterns...
Question
Bank 1 air fuel imbalance alarm car is misfire after it gets hot ok up till that time
Hi there. Check the spark plugs and see if the plugs have a good bold spark. If the plugs are not sparking, then either the plugs are fouled out or the ignition coils are not energizing. Check the fuel injectors...
Question
Misfiring Cylinder after replacing the plugs three months ago. Is it a chance that the whole batch of plugs may have been defective?
Hi there. The best thing to do is switch the coil over from cylinder 3 to cylinder 1 and see if the misfire continues with cylinder 3 or if it changes to cylinder 1. If the misfire stays with cylinder...
Question
Ford F150 shakes when pressing gas
If you are getting a check engine light coming on and flashing of the light when problem is happening. I would recommend having the engine computer scanned to see if you have misfire codes or codes to the intake manifold...

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