Engine lacking power, misfiring. - Accent Hyundai Cars & Trucks

SOURCE: Engine warning light flashes and then goes out.

cloged mass sensor

SOURCE: my jeep has engine misfire and a lack of power?

That Could be alot of things first you should check the basics Plugs cap rotor wires, if all those are good move onto the fuel system most auto parts stores have a tool loaner program which basicaly you buy the part but return it when your done for a full refund get the fuel pressure tester and hook it up to the port on the fuel rail start the car and you should have about 50psi if not you have a fuel problem if thats good I would go for the crank shaft positon sensor which is what mine turned out to be and its a common problem with these cars but its kinda of expensive and hard to get to is the reason i say dont go for it first. if you do replace it before you put it in make sure it has a strong magnet in it, I bought two from auto zone that had weak magnet but didnt know this at the time which caused a lot of problems because i thought how could i buy two bad sensors but again I changed it one more time one from the dealer which i noticed imeaditly when i tried putting it in it kept sticking to all the metal had a strong magnet and havent had a problem sense that was almost a year ago hope this helps if it does please rate my answer

ZJ Limited

• 17989 Answers
• Posted on Jul 20, 2012

SOURCE: engine misfiring

Hi there:

A misfiring condition may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer


Possible Solutions:
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.


Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


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