Question about 2001 Mercury Sable

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The engine is misfiring despite having the spark plugs and spark plug wires changed. It does not happen all the time, usually in the morning when dew has been on the car.

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Check out your crank sensor and coils. For the crank sensor just first check that the connection to it is clean and free of corrosion. When it misfires does it misfire on just one or two cylinders. Many cars share coils, one for two plugs. Follow the HT leads back and see how they are shared between coils. If two cylinders sharing the same coils are misfiring then this good evidence that their shared coil needs to be replaced. Alternatively if you have separate coils physically swap the coils around and see if the misfire also moves. If it does, it is obviously a fault with a coil set.

Posted on Oct 13, 2010


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97 acura 2.2 cl engine light p0302 code

A P0302 is indicating that cylinder # 2 is misfiring...Cylinder # 2 is the second plug counting from the front to rear of engine...Main causes for misfire are: defective spark plug, spark plug wire...When was last time plugs were changed? if it has been awhile I would suggest changing them...Also the spark plug wires should be replaced...Changing one plug and/or one wire isn't a good idea; change them all...Plugs cost two or three dollars apiece and a set of wires around $15...Standard motor products wire set # 4717...Spark plugs; Bosch platinum gaped at .044

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I have a 2006 Honda Pilot. About a month ago, my check engine light came on. I had it checked at Autozone for the code and it was "Spark Plug Misfire". I replaced all 6 plugs with hight quality NGKs. ...

Not sure, but may be the timing is off. Autozone should be able to check it with a timing light. The timing setting determines the firing of the spark plugs. It it is off, it doesn't matter how new the spark plugs are.

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How often should the plug wires and cap be changed

You only need to change them if you are having problems such as miss firing engine etc.

Jan 19, 2012 | 2001 Subaru Forester

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Misfiring after replacement of spark plugs and wires

If it wasn't misfiring before. Make sure you have the proper gap on the spark plugs. Make sure you have the wires connected in the correct order. If you have the old wires, you may want to end up trying those one at a time to make sure you don't have a defect wire either.
Thank you,

Mar 04, 2011 | 1994 Ford Escort

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P0301 - Cylinder 1 Misfire Detected.

- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

1 Answer

Transmission "Check" light has started to come on and flash how should I go about fixing. Is it a mechanics job or are there somethings I can try first.

A flashing check engine light is usually caused by a misfire. I'm guessing that the engine is running a little rough? Some things you can check are the spark plugs and wires. You can check the wires by spraying them down with soapy water and seeing if they leak.

If the engine is misfiring you can pull each spark plug wire or coil off of the spark plug one at a time with the engine running to see if the engine runs worse or stays the same. Be careful cause you can get zapped by 40,000 + volts and it can tickle a bit. Once you find the cylinder that doesn't change how the engine runs you can focus on that wire and spark plug. Look for carbon tracking on the plug itself. It will look like a dark black line running down the plug and the porcelain will be slightly erodded under it. If you see this you will need to change the plug and wire.

Oct 13, 2010 | 1997 Isuzu Trooper

1 Answer

Running good then bad

Good Morning,
Sounds like you need a good tuneup. An engine that is misfiring usually indicates fouled or worn out spark plugs or wires. Also, the engine timing. Try replacing the spark plugs making sure they are properly gapped. If you have your vehicles operators booklet it will tell you the spark plug gap or if you don't have the booklet your auto parts store counter person can tell you. Firs change the plugs and see if there is any improvement. If there is and your satisfied your done! If you are not satisfied try replacing the spark plug wires next. Be sure to match the wire lengths and only change one wire at a time! If this doesn't solve your problem have the engine timing checked by your mechanic.
I hope this will help you.
Have a great day!

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Hi, I have a 1997 Porsche 993. Motronic 5.2 M07. I am getting these fault codes 1) 62 misfire emissions-relvant 2) 51 Cylinder 2 misfire emissions-relevant) 3) 54 Cylinder 5 misfire ...

misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

Mar 07, 2009 | Porsche 911 Cars & Trucks

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1998 Dodge Intrepid: engine misfiring

usually wires ign wires & plugs but could be your ignition coil!!test it don"t guys$$ have a spark tester if not invest in one don't bother using a spark plug your just waisting time with that!~

Dec 29, 2008 | 1994 Dodge Intrepid

1 Answer

No ecceleration under load

Most cars I have encountered with misfire problems were the result of several problems.   1.  Were factory recommended parts installed? (ie. Mazda uses NGK plugs not champion plugs.) I am also not an advocate of splitfire plugs and other after market parts. 2.  When was the last time the plug wires were changes?  I normally change mine every 60,000 miles regardless of engine trouble.   3.  When was the last time the cap and rotor for the ignition system changed?  Same as plug wires,I change them every 60,000 miles. 4.  If you accidentally crack the porcelain on any of the spark plugs, then you can also expect a misfire. 

Dec 21, 2008 | 1995 Hyundai Elantra

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