My service engine light is on in my 97 neon. had it plugged in and came up miss fire on 1 & 3. i replaced the plugs, wires, and coilpack. code cleared but then came up as fan relay open or short so i replace fan relay sensor behind driver headlight. code cleared and fans worked. it then bounced back to the miss fire code so i replaced the computer. service engine light wont shut off and cant get it inspected. can you help?
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The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persist more tests needs to be done. PO307 is the same thing except number 7 cylinder.
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
The spark plug wires might be bad, Are the coil packs a wires together in one? With the engine off, loosen each plug wire so as to when you start it you can not have to battle with it First do this with dry floor, rubber sole shoos and a pare of rubber or vinyl gloves. As its running pull 1 plug wire off at a time. When you get to a plug that doesn't change the sound of the motor you've found your miss. Did the CK engine light come on?
Be careful, when its running, slowly pull each spark plug wire up, if you see sparking coming out of the side of the spark plug boot, replace the wires and spark plugs. Use the correct Champion Spark Plugs.
you need to check the check engine light first. then the miss can be from the oil on the spark plug i would replace that spark plug with oil on it and replace the valve cover gaskets this will prevent the problem from happening again
For some reason neons require Champion brand plugs,like the one's from the factory. Also check the plug wires. If it's also got a nasty oil leak on the driver's side the cam sensor is probablt the culprit,causing the misfire.
YOU NEED TO CHECK DARK GREEN/ORANGE WIRE AT IGNITION COIL WHEN CRANKING ENGINE FOR POWER..IF NO POWER,SHUTDOWN RELAY IS NOT BEING ENERGIZED..THIS ENGINE ALSO HAS CAMSHAFT POSITION SENSOR ON END OF CYLINDER HEAD..ENGINE CONTROLLER NEEDS CAM AND CRANK SIGNALS TO ENERGIZE THE SHUTDOWN RELAY..UNPLUG CRANK SENSOR AND CHECK VOLTAGE ON ORANGE WIRE..SHOULD HAVE APPROX 8V..IF NOT..UNPLUG CAM SENSOR AND SEE IF 8V SUPPLY RETURNS..IF NO POWER TRY UNPLUGGING VEHICLE SPEED SENSOR LOCATED IN TRANS HOUSING WHERE RIGHT SIDE AXLE COMES OUT OF TRANS..IF 8V RETURNS..THE SPEED SENSOR IS SHORTED INTERNALLY..THESE 3 SENSORS SHARE THE SAME 8V SUPPLY CIRCUIT..WITH SPEED SENSOR UNPLUGGED,PLUG CRANK SENSOR BACK IN AND TRY TO START ENGINE..HAVE SEEN THIS SAME PROBLEM AT WORK RECENTLY
Check the spark plugs and wires. Look at the plugs to see if there is a black line vertical on the ceramic part. That would indicate a faulty plug wire, a common problem of the 2.0 litre engine in the Neon and PT Cruiser.