I noticed a sensor on the driver's-side camshaft, and also a sensor behind the crankshaft sprocket.
I've been told that with these sensors, and also a knock sensor somewhere, the computer can compare all that data - along with fuel injector pulses for each cylinder - and figure out a lot.
I tore it back apart last night (took less then half an hour). I will repost today if I fix it. It appears that the right-cam is one tooth off and left cam is fine. This because the timing marks on the belt are incorrect. The cam that is one tooth off runs on cylinders #1 and #3 - the ones that now give an error code as "misfiring."
Right now - the issue seems to be mis-information. From all I can tell, the tooth count on the timing belt on the SOHC 2.5 is different from other similar engines (like 2.2s) - and the info is wrong in the factory service manual. Subsequently, new aftermarket timing belts are marked wrong.
I did a lot of searching and finally found two people who had the exact same problem. So, I took the original belt and examined with a magnifying glass. Sure enough, I found the old OEM timing marks and they do NOT match the new belt.
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