Hey Gang, I pulled this of the "alt.autos.dodge.trucks" newsgroup for those
of you that missed it.
=====================================================================
In hopes this will help all with the pinging problem they are experiencing.
Chryco TSB #18-24-98 covers 96-97 Vans, Dak's, Ram's, Cherokee's and Grand
Cherokee's with 2.5L, 4.0L, 3.9L 5.2L & 5.9L engines. This TSB announces a
new software revision that allow the dealer to tweak the timing slightly to
mitigate the engine ping condition. Also, Chryco TSB #18-48-98 covers '94 -
'99 Dak's & Ram's, '94 - '98 Grand Cherokee's and '98 & '99 Durango's, all
with 5.2L & 5.9L engines. It identifies a possible crossfire problem with
the plug wires and offers new P/N's for isolators and convolute insulation
that will mitigate this problem also. Contact your dealer for more info on
these fixes. Hope this helps... Good Luck!!
Chryco Service Manager
Member SAE
Mike Simmons wrote in message <36ccd713.0@news.fidnet.com>...
>To add yet another thread to this seemingly endless discussion, I forthwith
>will throw my two cents worth in!
>I was unable to determine what model year 5.2L/5.9L engines we are dealing
>with, however Chryco just released a TSB that offers a software update that
>allows the dealer to "tweak" the timing slightly to alleviate abnormal
>engine ping. This TSB does not apply to all model years, so let me know
>what year and I will check for you or check with your dealer. Also, I have
>found that an excess carbon buildup in the combustion chamber can be the
>cause of a lot of abnormal engine ping. It seems that the carbon deposits
>retain heat from the power stroke (ugly Ford word!) and incandesce and
allow
>preignition of the air/fuel mixture. A good commercial combustion chamber
>cleaner, or in severe cases sand blasting the chamber with walnut shells
>thru the spark plug holes has fixed many of these cases. Good Luck!
>
>Chryco Service Manager
>SAE Member
>
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