The FSM, under Fuel Requirements, states in the first paragraph:
Your engine is designed to meet all emissions regulations and provide
excellent fuel economy and performance when using high quality unleaded
gasoline having an octane rating of 87. The use of premium gasoline is not
recommended. The use of premium gasoline will provide no benefit over high
quality regular gasoline, and in some circumstances may result in poorer
performance.
Now don't go jumping all over me. I didn't write the above, DC did. I do
agree that you should not have to put premium in your tank. I did find,
however, that my pinging with the stock PCM was eliminated when I used 89
octane. It is possible that I may have eliminated the pinging by one or
more of these other options as well.
1) Changed to a colder plug (Autolite 3923's)
2) Changed to a 180 t-stat.
3) Have the dealer retard the timing by flashing the PCM.
Ron
00 SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Patrick and Kelly
Engram
Sent: Thursday, September 14, 2000 5:50 PM
To: DML
Subject: DML: 5.9L octane rating
Hey, I just picked up my truck at the dealer. ('99 R/T) One of the
items I asked to have inspected was the pinging problem. I gave them
the tsb for the wire rerouting, and advised that Dodge supposedly now
has a computer flash that retards the
timing if the problem cannot be corrected.
Well, the tech asked me what octane I used. I told him 87, which is
what it is spec'd for. He said, No, Dodge says you have to used 92 on
the R/T, prowler, and something else. You can see where this is going.
So, I came home and tried to search the archives for R/T, octane
rating, 5.9L, etc. and the only stuff I came up with this year relates
to octane after installing the m.p. computer, which of course calls for
super unleaded.
I also searched the Dak. spec page that someone posted a few weeks
ago, and it has all but octane rating on it.
So, I need help. Where can I find in print by Dodge that they built
this truck to run on 87? Oh, by the way, I bought
it used and dont have an owners manual.
Thanks,
Patrick
patrickandkelly@erols.com
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