SOURCE: MoPar Performance News, Tech Tips, by Larry Shepard - Mopar Chief
Engineer
>
>The problem is related to the gasket that seals the cover to the bottom of
>the manifold on the Magnum engines. If this gasket does not seal properly,
>the engine can suck in oil vapors from the lifter valley and cause the
>engine to detonate due to the aggressive spark advance curve used in the
>Magnum computers. Remembering where this gasket is located, this is not
the
>first thing that you want to do. It could be expensive and time consuming
>to pull off the intake to check. However, we have a helpful tip. To
>determine if there is a proper seal, remove the PCV (Positive Crankcase
>Ventilation) valve from the right hand valve cover, but leave the PCV valve
>attached to the hose from the intake manifold. Remove the breather hose
>from the left-hand valve cover that goes to the air cleaner. Plug-off the
>connection at the valve cover. With the engine idling, place your thumb
>over the opening where the PCV valve was located. After 10-15 seconds you
>should feel pressure, which indicates that the gasket is sealing. If you
>feel a vacuum, the gasket is leaking and needs to be repaired. The best
>repair is to remove the intake manifold, remove the bottom plate and
discard
>the failed or leaking gasket. Clean all the surfaces thoroughly, and apply
>a bead of Mopar RTV sealant, PN 82300235 to the bottom of the manifold.
>Re-install the plate, let dry and then re-install the manifold. Refer to
>the service manual for manifold installation tips and details.
-----Original Message-----
From: Bernd D. Ratsch <bernd@texas.net>
To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
Date: Tuesday, March 02, 1999 10:10 PM
Subject: RE: Re[2]: : DML: Pinging????
>Doesn't make any sense though...other Dak's run just fine...without the
>modifications. That tells me that something in the basic system is wrong.
>(Wonder if this may have to fall into the Lemon Law..)
>
>
>> -----Original Message-----
>> From: owner-dakota-truck@buffnet4.buffnet.net
>> [mailto:owner-dakota-truck@buffnet4.buffnet.net]On Behalf Of
>> fawcett@uism.bu.edu
>> Sent: Tuesday, March 02, 1999 8:46 PM
>> To: dakota-truck@buffnet.net
>> Subject: Re[2]: : DML: Pinging????
>>
>>
>> <<My 95 V-8 used to ping. Tried every type of fuel and nothing helped.
>>
>> Put in a 180 degree thermostat and that helped some, still ping a
>> little,
>> but not as bad. Put the JBA headers on, now it pinged even less, on
>> 87 octane, running on 89 octane now I don't get any pinging at all.
>>
>> So between the 180 thermostat, headers and 89 octane gas I got
>> rid of my pinging.
>>
>> Bob>>
>>
>> AHH HA! I knew somebody would confirm this sooner or later! I
>> had done the
>> 180, FABM, different octane's and additives but nothing stopped
>> the ping 'till I
>> put the headers on (mine are JBA's as well)... Nobody has been
>> able to explain
>> why this is, but with this confirmation --I'll take what I can get!
>>
>> L8R,
>>
>> Tom
>>
>>
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