I have changed : fuel injector ,plugs ,plug wires,and fuel injections ..but still have the same problem >> engine misfire while driving exactly when rpm reaches 2.5 and above .
Are the leeds ok and the coils this also causes a miss fire
SOURCE: My 2002 Hyundai Elantra Gt (2.0L)engine runs rough
The Hyundai online shop manual and my newly arrived Hyundai shop manual kept pointing to the coil as a possible problem. While preparing to check coil continuity I discovered the pigtail connected to the bottom of one of the coils was loose and the contacts were burned. This is the coil that supplies spark to plugs 1 & 4, the same ones that kept showing up each time the check engine light illuminated. After cleaning the contacts and making sure the pigtail was securely attached to the base of the coil I have had no further problems.
SOURCE: I have a 2002 Hyundai Elantra. The check engine
check for a bad valve. i had the same problem only #3. it was a bad exhaust valve.
SOURCE: 2002 Hyundai Elantra 2.0, #1
If it is only that circuit and not the parts itself, it is likely that either someone has damaged the wires going to the ECM to drive the injectors or the ECM has failed on those 2 drivers. My suspicion is that this happened shortly after the install. Find where the wires are for the device itself and see if they are in close proximatey to any wiring harnesses or has been cut. This is where you will likely find the culprit.
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there is no check engine light so i can't do a computer test ...Now , what Possibilities should i take in mind if misfire doesn't exist when engine is idle ,Misfire only exist when driving . HOPE SOMEBODY CAN HELP.
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