I just tried high octane myself and the problem was greatly reduced. I
ran it all out, put regular back in and the problem came back instantly.
This seems to me to be pinging rather than valve lifter roller rattle. My
Dakota was built for the east coast which does have special emmisions
requirements, but I doubt they're the same as California. But maybe
there's a similarity in whatever is causing this problem.
>
>Date: Tue, 20 Oct 1998 10:53:25 -0700
>From: mastres@id.ucsb.edu (Tony Mastres)
>Subject: Re: DML: Ping and Rattle problems
>
>I've had the exact same problem for about 6 months with no
>resolution. I
>have found that higher octane gas will reduce but not eliminate the
>problem. The oddest diagnosis was that something in the California
>emissions packacge was causing it. I really dont know enough about it
>to
>believe or discount this theory but I was wondering if this is a
>California
>problem moreso than other parts of the country?
>
>------------------------------
>
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