I had the OBDII telling me that there were missfires recorded on three cylinders. It also gave me the "random missfires" code. I marked the three potentially bad packs and moved them to other locations when I changed the spark plugs to see if the problems would follow the packs. I also checked for oil leaks etc.
Anyway, I haven't really driven the car too much since I did this. The other day I took it out and it was driving poorly again. The check engine light came on and I got the "random missfire" code again along with two cylinder missfire codes.
I will most likely replace some of the packs. I'm more worried however that i've got a vacuum leak which is causing the car to lean out and is giving me the missfires rather then the actual packs being bad.
Anyway, I was curious if the graph I posted showing timing being all over the place indicated some other issue or might be a symptom of a vacuum leak or failing coils.
Ryan
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Originally Posted by shorod
I'm trying to understand what you mean about the missing when you type, "were missing are, it seems missing again." Are you saying that the coils that were missing in the original locations are still missing in the "new" locations? Did you move the spark plugs to the same cylinders as the coils? I would have suggested you leave the spark plugs where they were, it's helpful to only introduce one variable at a time during diagnostics.
Was cylinder #1 missing before and still missing now, even with a different spark plug and coil?
-Rod
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