Question about 2004 Hyundai Elantra
Many possible causes for this. Do you have a "Check Engine" light? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.
Soot/Carbon buildup on plugs can be caused by many things, like leaky intake valve seals, excessive crankcase emissions being sent back into the intake air hose, leaky fuel injectors causing an excessively "RICH' fuel mixture, excessive fuel pressure from the fuel pump, faulty fuel pressure regulator, worn/faulty PCV, a faulty O2 sensor (upstream) or even a defective ECU.
Posted on Oct 04, 2009
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Posted on Jan 02, 2017
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