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My 2005 chevy cavalier #2 cylinder not firing good.i changed spark plugs but still have problem .can you give me diagnosis ?
My car was running good one night.the next day i wen't out to start the car and it started missing real bad.i changed spark plugs but no change in performance!
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If it's just one cylinder, it could be the spark plug or the spark plug wire...or, you could have a plugged or malfunctioning injector (if your car has fuel injection).
Spark plugs get there voltage from the ignition coil packs, more then likely you have a bad coil pack or coil pack boot, pull one coil pack or spark plug wire or boot at a time, if you see a drop in rpm, that one is good, if no drop bad coil pack.
well first you need to perform a compression test, this will tell you right up front of you have major engine trouble be it head gasket, camshaft, cylinder rings etc. First things first what do the spark plugs look like after it has benn running for a while??
Firing Order on 2.2 liter: 1-3-4-2
Cylinder number: 1-2-3-4 from passenger to driver's side
From the coil from fire wall to radiator: #1 coil 4-1 #2 coil 3-2
Good luck and this should help you get your car running 100% again.
it fires 1-3-4-2. The coil pack is marked 1-4, match them up with your cylinders, and you're good to go! Cylinder 1 is on the front of the engine, the side opposite from the transmission. Find your alternator and that's at cylinder 1.
The cylinder closest to the passenger side is number one. Firing order is 1, 4, 3, 2
Where is your coil pack located in reference to the engine? I need this info to give you accurate placement of the spark plugs.
Charlie
The reason I'm asking this is because a dual coil fires BOTH plugs at the same time. If one plug doesn't fire right, the other won't either, even to a point that neither does. Kepp the coils where they are and swap the plugs and wires and see if you have a change. Let me know
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