I have an Explorer 2002 that recently started to Ping & rattle at acceleration. Had a tune up at 100K and runs well. However, the pinging and rattling is evident. No check engine light. Fuel consumption seems to be normal. I put CFoam in gas tank, but no luck. Any ideas?
Was this doing this before the tuneup? Did it gradually start? If it's carbon, there's a way to run seafom through the intake while it's running to help clear it.
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