Question about 2000 Mercury Sable

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It shows cylinder 4 misfire ,,i changed spark plug and ignition coil but still same problem ,,engine shakes while driving but after 60mph its smooth........

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A misfire can either be fuel, spark or mechanical........have you had the compression checked for a bad cylinder......as it is injected, are you sure whether this is blocked or not working.....and are you getting a spark from the coil.....each of these need to be checked

Posted on Aug 26, 2010

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2006 grand prix gxp 5.3. When you are driving normally it will miss from 50mph and up. When you punch it it doesn't miss a beat. I cleaned the maf sensor and air filter, Plugs were replaced.


It's probably a coil breaking down , have a scan tool hooked up an have misfires checked to see which cylinder is missing .
Ignition Coils
Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.
Drive it long enough like that (with it misfiring ) the check engine light will flash . This is to warn that a catalytic converter damaging event is taking place . This would also set a DTC - diagnostic trouble code
DTC Descriptors ?€¢
DTC P0300 Engine Misfire Detected


?€¢
DTC P0301 Cylinder 1 Misfire Detected


?€¢
DTC P0302 Cylinder 2 Misfire Detected


?€¢
DTC P0303 Cylinder 3 Misfire Detected


?€¢
DTC P0304 Cylinder 4 Misfire Detected


?€¢
DTC P0305 Cylinder 5 Misfire Detected


?€¢
DTC P0306 Cylinder 6 Misfire Detected


?€¢
DTC P0307 Cylinder 7 Misfire Detected


?€¢
DTC P0308 Cylinder 8 Misfire Detected

Apr 26, 2016 | Cars & Trucks

1 Answer

Engine light came on and said 8th cylinder misfire i changed spark plugs and ignition coil but still showing same problem


Could be a clogged fuel injector. Check all ignition connections to make sure they are clean and secure as well as the one for the associated fuel injector.

Jun 11, 2012 | 2003 Ford Crown Victoria

1 Answer

Ford five hundred running on 5 cylinders


the code p 0302 refers to no 2 cylinder misfiring===causes --engine mechanical fault ---wiring--ignition / fuel system---injector--ECT/Maf sensor ---ECM
you state that the engine runs normally for several seconds so I would eliminate a mechanical fault at this stage
most misfires are from faulty injectors so reposition the injector to another cylinder and see if the miss moves along as well
if it doesn't move but stays at no 2 cylinder , then it could be a problem ECM
if you can get a substitute ECM of known good performance , swap it out and see if that fixes the fault

Mar 26, 2017 | 2005 Ford Five Hundred

2 Answers

I have a 2008 dodge avenger se and my engine light is on and was flashing before. when it is in drive or park it turns off when i stop. i took it to auto zone and the told me that cylinder 3 and 4 misfire...


The best way to fault find in swap coil 1&2 with coil 3&4. If the fault doesn't change, it is possibly the plugs or something more sinister electrically.

Sep 18, 2017 | 2008 Dodge Avenger

1 Answer

Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2004 Ford F150

1 Answer

Car keeps giving p0303 code.


Code P0303 means that there is a misfire detected on cylinder #3. This could becaused by anything from a worn out spark plug to a blown cylinder head gasket, a faulty fuel injector, a bad ignition coil, or a leaking intake manifold gasket. I have also seen this type of code caused by clogged-up EGR ports in the intake manifold on certain engines. "Freeze Frame Data" stored in your Engine computer along with the fault code is designed to help identify what engine conditions (high speed/slow speed, heavy load/light load, etc.) are producing the misfire. This helps a lot in identifying exactly what is causing the cylinder to misfire.

One way to eliminate some of the possible causes is to swap parts with another cylinder to see if the code changes.

If you have "Coil-On-Plug" ignition, you can swap the coil on #3 cylinder with the coil on #4 Cylinder and swap the #3 spark plug with the #2 spark plug. Then clear the codes and drive the car till the Check Engine (or Service Engine Soon) light comes back on.

If it still gives you P0303, then it is not being caused by the plug or the coil. It could be any of the other possible causes listed above.
If it now gives you P304, replace the bad ignition coil that is now on #4 cylinder.
If it now gives you P302, Then replacement of all the spark plugs is recommended.

Dec 26, 2010 | Chrysler PT Cruiser Cars & Trucks

1 Answer

2003 mercedes Benz C240 codes P0300, P0301, P0302 and P0303. Please, help me how to fix?.


P0300 Random Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
according to this fault codes first mark ignition coils
3 ---------------- 6
2 ---------------- 5
1 ---------------- 4
RB-------------LB
this right banks and left bank, please remove Ignition coils with lids and spark plugs from right bank and swap with left bank, if fault code change as
P 0304 Cylinder 4 Misfire Detected
P 0305 Cylinder 5 Misfire Detected
P 0306 Cylinder 6 Misfire Detected
You can Identify it's a faulty ignition system then next swap ignition lids from ignition coils be careful each coils have two lids one short and other long bit deference and when you remove and fix it to the car keep in mind correct order because each coil two different fire for two spark plugs don't mix up, if you mix it can create the fault code.if you detect any fault ignition coils or spark plugs or lids replace that and also whether god or bad recommend to replace spark plugs, find the right that's most important thing, if this way couldn't found the any ignition fault next step is check fuel presser, when the engine running fuel presser must be around 4.5 bar without engine running must be 4 to 6 bar if the fuel presser too low need to check two different things one is fuel pump other is fuel injectors, in this case you can swap injectors from right bank to left bank and find is the injectors leaking, if not leaking faulty fuel pump.is this information helped you? if yes please leave a comment,

Oct 15, 2010 | 2007 Mercedes-Benz C230 Sedan

2 Answers

My check engine light is on and the code is reading p0304 what could be the problem


You have a Misfire at Cylinder #4 meaning:
Dirty, fouled or malfunction Spark Plug at #4 Cylinder. Remove the Spark Plug and check the igntion (spark end).
Ignition (Spark Plug) Wire malfunction for #4 Cylinder.
Misfire from the Coil/Distributor at the #4 connection from Cylinder #4.
Get a Spark Plug/Wire/Coil/Distributor tester and check the Spark Plug, Wire and Coil.
I always recommend changing everything in sets meaning: Change all Spark Plugs and Wires.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

Feb 18, 2010 | 2003 Ford Expedition

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