Question about Hyundai Cars & Trucks
What repair is most probable with this diagnosis?
Bad coil.... To be sure, unplug that coil and change it with another one of the 7 other,,and restart..the code should be another one....
Posted on Mar 02, 2019
Does that engine have individual coils per spark plug? could be a bad coil for that plug
Posted on Mar 02, 2019
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Posted on Jan 02, 2017
Fuel injector cleaner commonly has a low success
rate, and will not help if it's more than one cylinder that is
missfiring. The fact that you have a "rattle" noise, leads me to beleive
the engine is not receiving fuel on one or more cylidners. If it is all
the cylinders, than the fuel pump may be the culprit, or the fuel pump
circuit. But if only one cylidner is missfiring than it is a possibly an
injector. A code P0300 refers to all cylinder missfires, and any code
between P0301-P0308 distinugiushes a particular cylinder.
1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.
Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms
Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )
Hope help with this (remember rated this). Good luck and have a nice day.
Posted on Mar 05, 2010
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