OK… according to mechanics.. the reason why #4 cylinder was a misfire … the sleeve dropped (fallen/loose) ??????? and now they are recommending for me to get a new engine?????? OH LORD… advice? Anyone? My vehicle is a 2003 … vehicles older than this last longer… I’m not sure what may have caused this??????? I guess I’m just that lucky…
We have a 04 discovery with the same problem except it is cylinder #3. It has 62,000 perfectly maintained miles on it. There are three other 04's in service for the same problem. It is a defective motor and you shouldn't have to pay for their inability to make a motor that last's less than 100,000 miles or much more!
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the misfire on a particular cylinder can be from several reasons
1--- mechanical--burnt valves , loose valve seat insert , hydraulic tappet holding valve open===run a compression test to eliminate mechanical faults
faulty injector, faulty injector tip( blocked) faulty injector wiring, plug, ht lead --ecm
cracked insulation in distributor cap or coil housing
moving a faulty injector to another position will move the miss or simply replace it with a known good unit
There are a few reasons why you would have a misfire on this engine. After having your codes read, it should tell you which cylinder is not firing. The next thing you need to do is check spark on the cylinder. If no spark, change the coil on that cylinder. If you have spark, you need to check the compression on the engine. Start with that cylinder, but I would check them all. If low, or no compression, the valve cover needs to be removed and check to see if a rocker arm has fallen off. Sometimes it's as simple as putting it back on. However if the rocker arm doesn't fit back tightly, chances are you have a valve seat that has dropped from the head. This is very common on these engines and requires someone very mechanically inclined to repair the problem.
your engine is misfiring according to your codes ...4 codes 4 problems P0300 - Random Cylinder Misfire DetectedP0301 - Cylinder 1 Misfire DetectedP0302 - P0312 Cylinder X Misfire DetectedP0325 - Knock Sensor 1 Circuit (Bank 1)Just showing a few
Hi Cliff, P0304 is an error code for a misfire of #4 cylinder. This usually means that there is poor / no ignition of fuel in the cylinder and is providing little if any power (due to a number of reasons - including: poor compression, or a faulty #4 spark plug, spark plug wire, distributor, etc). In an 8 cylinder engine, that would mean 1/8 of the power is lost; for a 6 cylinder engine 1/6 of the power is lost; and so on. The more cylinders your engine has, the less likely this problem would be noticed. Loosing 1/4 of the power in a 4 cylinder engine would probably not go unnoticed for long. The unburnt fuel in #4 cylinder is being exhausted with the other cylinders and is being burned in the catalytic converter instead of the engine. If allowed to continue, it may cause the converter to fail. You should have the trouble checked and repaired before it causes other problems. Good luck!
p0304-misfire no 4 cylinder--can be bad plug-coil -wire-problem with 02 sensor--fuel injector-bad exhaust valve-cat conv- poor ,compression -these are most of the reasons that an cause a misfire and yours is specifying the no 4 cylinder
code p0300 refers to--random/multiple cylinder/s misfire detected...Causes---spark plugs---HT leads---injectors---ignition coils ---low compression ---wiring code p0302 refers to cylinder 2 misfire detected Causes ---engine mechanical fault---wiring---ignition/fuel system ---ECT/MAF sensors ECM code po303 refers to cylinder 3 misfire detected Causes Engine mechanical fault---wiring---ignition/ fuel system ---injector---ECT/MAF sensor ECM The common fault to all is the fuel/system ignition I would have the injectors checked and have a pressure test done on the fuel manifold to check pump and fuel regulator valve.
Is there a coil per cylinder? That's sounds like a faulty coil, that can cause a misfire in a cylinder. It's relatively easy to test.
Start your engine and when the car rpm's drop, remove the coil socket from cylinder number one and if the car hesitates more that means that cylinder is working good, then reconnect and continue with cylinder number two, remove the coil socket and look very careful for hesitation and reconnect and so long until you check all off the cylinders.
If you disconnect a coil of any cylinder and the engine remains the same, doesn't hesitate more, then that cylinder isn't working, so change that coil.
Begin with cylinder number 4 if you want to cause of the scanner reference.
misfire that occurs in
a given cylinder will set a P030X code where "X" will be the
the cylinder that is misfiring.
For example, a P0302 code would tell you cylinder number
two is misfiring.
The misfire might be due to: 1. a fouled spark plug, 2. a bad plug wire, 3. a defective ignition coil in a DIS system, 4. a clogged or dead fuel injector or, 5. a loss of compression due to a leaky exhaust valve,
leaky head gasket or worn cam lobe.
On some vehicles, the OBD II system
itself will disable a cylinder if it detects a high enough rate
misfire. This is done to protect the catalytic converter. By
off the cylinder's fuel injector, the OBD II system prevents
fuel from passing through the cylinder and entering the exhaust.
fuel in the exhaust is bad news because it makes the converter
and if it gets too hot it can suffer damage. What else does OBD
add to the equation? It
also monitors the operation of the catalytic converter with a
oxygen sensor on the tailpipe side of the converter. By
upstream and downstream O2 sensor readings, it can determine how
the converter is doing its job. If converter efficiency drops
certain threshold, the OBD II system will set a code and turn on
Check Engine light.
OBD II can also detect fuel vapor leaks
(evaporative emissions) in the charcoal canister, evap
fuel tank by pressurizing or pulling a vacuum on the fuel
system. It can
even detect a loose or missing gas cap. In addition, OBD II
can also generate codes for various electronic
problems and even air condition failures such as a
Try a compression test. You could have a bent valve or a bad ring on the piston. If the compression test shows it to be much lower than the other cylinders then its a mechanical problem. The valve may not be seating or a weak spring isn't allowing the valves to close and its leaking under load.
Cylinder Number 1 Misfire Detected Possible Causes:
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical problem that affects only Cylinder 1Fuel delivery component problem that affects only Cylinder 1 (i.e., a contaminated, dirty or sticking fuel injector)Ignition system problem (coil, plug) that affects only Cylinder 1