I'm guessing you had to remove all the coil to put the new one in. When you reinstalled the coil packs, did you make sure your they are grounded?
SOURCE: Random Cylinder Misfire
Get a Haynes manual for your vehicle and use the troubleshooting guide there. about $20 from amazon, auto parts store or haynes.com. This WILL save you time and shortcut this and any future diagnosis. Haynes IMHO are top notch and I like them better than some factory service manuals that fgo for $100 and more.
David, 99 Saturn, Cam position sensor codes seem to indicate a engine timing (not spark, but crankshaft/camshaft sync). Old timing belts or worn tensioners can cause belts to jump a tooth or two which can have a pretty dramatic effect. The belt could also be old/dryrot and have lost a tooth or two causing it to jump. If any of these are the case, or if the timing belt interval is near, replace timing belt, tensioner, idler roller if present and water pump. FYI, quality OEM ignition wires shold last at least 10 years. If they are really bad, you can open the engine compartment on a dark night and you will see sparks arcing between them and/or something metal nearby. We all replace wires when we are not sure what the problem is, and regardless of what anyone tells you, it only rarely solves anything unless the car is more than 10 years old.
good luck.
SOURCE: 2004 pontiac grand am misfire
Check the plug wires for those 2 cylinders, next check the injectors, as they can cause misfire when defective.
SOURCE: 2004 Lincoln navigator misfire on cylinder 8 error code p318
Replace the coil pack once more. I went through 2 new ones on my f150 on one cylinder. One worked, the other didn't (both new off the shelf). Condensation build up in the boot caused mine to misfire. Anytime you replace a coil pack, squirt a little silicone grease inside. This will prevent condensation from hitting your plug. Fords are notorius for this problem, especially if you live in a humid area. Also, make sure and clear the codes after you make the repair.
SOURCE: I HAVE A 1993 SATURN SC2 I HAVE BEEN HAVING PROBS WITH
You may be faced with missing cylinders due to exhaust valves sticking or not seating/sealing well generally caused by excessive oil consumption through valve seals and poor fuel quality.Listen to the exhaust while idling in gear and you may hear popping and feel the suction inwards on your hand which helps indicate this problem exists.Perform compression test on all cylinders and should see no more than 20% variance in the compression readings. One last ditch effort before removing the head and servicing valves may be to replace valve seals and run chevron techron in fuel system and run engine at freeway speeds for an extended amount of miles.This is the only additive that has proven usefull with this problem but works best as a preventitive measure before cylinders start dropping.
Misfire is almost always bad spark plug and/or ignition coil. I wouldnt trust an OBDII scanner to correctly diagnose which cylinder is misfiring. Your best bet is to replace the coils in all 8 cylinders (or 6 if its a V6) since when one goes out it makes the others work harder, meaning that they arent far behind
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