Put a code reader on and it said misfire on 1&4. Thats why changed the coil pack and spark plugs. Just been MOT.
The problem could be several things and the first thing to test/replace would be the oxygen sensors
Dribbling injectors and/or bad spray patterns is another possibility.
Intake air leaks; gasket or vacuum hose. Blocked crankcase breather.
These engines are particularly sensitive to any poor intake valve seatings. The smallest leakage can cause a lumpy idle and a standard compression check is useless. The key to accurately testing these is a cylinder leakage test.
SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4
ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.
SOURCE: Misfires on 1997 Hyundai Elantra!!!
can you please tell me how to fix these 2 codes on a 1.8L HYUNDAI Elantra p0707 and p0712 i just had the trans rebuilt and now these codes are coming up
SOURCE: Code P0300 misfired detected. I have cylinder 1
sound like bad ignition module.make sure where coil pack set in module contacts is clean and making good contact.also make sure plugs and wires is good.
SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my
A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.
SOURCE: 2004 Alero...Car will not start now. Changed fuel
did you check the ICM (ignition control module) that's what the coil pack sits on. Inspect if for wire damage and you can remove the ICM and have it tested at Auto Zone or Parts Source free of charge.
Thank you for using FIxya and good luck
Testimonial: "thanks for the advise. I took the ign mod.to auto zone and auto eletical shop and both cannot check it. Says it works or it dont..still wont fire"
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