Quote:
Originally Posted by jbash87
hmmm... I know it's a blow to one's ego, but if you're getting errors right after you've done some work, you've got to go back over that work and double/triple check it. It happens to the best of us.
No misfires doesn't necessarily mean complete combustion. Even the best manufacturers can let a small number of bad parts through. In the industry we call this DPPM, or Defective Parts Per Million. The goal is to reduce this, but that also means some bad parts will eventually slip through.
I don't disagree.
All this to say, I'd double check that work. Look at the spark plugs and see if you find any anomalies. I'm not a good spark plug reader by any means, but there are plenty of pictures online which detail how certain conditions will affect the appearance of a plug.
At that point you should be able to narrow in where the issue is. I could certainly be a leak in the manifold.
When does this occur? Is it right away, only when cold, only when warm, etc?
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It's very difficult to tell. I erase the error and it comes back after driving - sometimes almost right away, sometimes after a few days, which tells me that it is a somewhat intermittent issue.
I went in there and double check that all my oils and CCV tubes are tight, and they are. I don't imagine a spark plug being bad, they generally either fire or don't fire, and its more or less the same for coils, a faulty coil would cause spark not to fire and cause a major misfire.
I could technically get one extra plug and one extra coil and keep swapping cylinder by cylinder, and i see if anything changes, but I doubt its the plugs or coils. The engine runs great under all conditions - idle, moderate throttle, and WOT.
I only changed the upper CCV tubes, so maybe the lower tube on bank 2 has a slight leak. Its almost impossible to reach from the top, so I can't DIY it.
I'll see if my mechanic can do a smoke test to see if there is a vacuum leak somewhere.