Question about Hyundai XG300
P0301 Code - Cylinder #1 Misfire Detected
A P0301 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1.
Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
A code P0301 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Same procedure to test and check other cylinders on misfire condition.
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Posted on Feb 15, 2012
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Posted on Jan 02, 2017
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Posted on Dec 30, 2008
SOURCE: cylinder 5 missfire 1999 tahoe
How is the pressure in the fuel rail? a low pressure will cause erratic firing of the injectors - the further down the rail u get usually the worse the problem. If the fuel filter was not changed regularly or if the vehicle stood for a while, dirty fuel/standing fuel at some time in the recent past, this **** will accumulate in tyhe injectors. To avoid spending a loada cash, swap a few injectors around and see if the problem moves with the injector.
Posted on Jan 07, 2009
SOURCE: missfire #1
Might be a sticking valve. If they stick, then they usually do it when the engine is cold. Hook up a vacuum gauge, then start the engine cold: if the needle bounces during the misfire, then suspect an intake valve is sticking.
Posted on May 05, 2009
SOURCE: benz e420 multiple cyl missfire
also check and see if the updated Mass Air Flow sensor has been installed, these go bad all the time causing all kinds of weird misfires and other problems.
Posted on Jul 12, 2009
SOURCE: Cylinder 2 missfire detected
Get a Compression tester.Its easy to do. Remove the plug and screw this in to the spark plug hole and disable the ignition system by pulling the ECM fuse. Crank the engine for 5 seconds and stop. Check the gauge. It should show 150 psi or close to it. If it shows under that check some of the other cylinders and see if they read the same thing. If they give a better reading then you could have a bent valve, a blown head gasket or broken rings or even a hole in the piston. If your unsure then take it to a shop and have them run a compression test on it for you. And make sure you stay in the shop while they do it and see the reading for yourself.
Posted on Jul 13, 2009
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