Erica,
I presume that when the dealer repaired your intake manifold gasket, they
used RTV sealant for the gasket material rather than a replacement gasket?
That is what the proper fix (as described by MoPar Tech Larry Shepard) calls
for. Apparently, if it's just a replacement gasket, that too can fail, they
recommend using an RTV bead.
Also, have you had the distributor indexed? Sometimes the distributor may
be off slightly, and this has been shown to be the cause of pinging on some
of these engines. After the distributor is indexed, the computer may have
to be re-flashed.
On a final note, if the engine still pings after the truck goes out of
warranty, replace the wires with some Magnecors. In the meantime, you can
check for spark leak by running the engine in a TOTALLY PITCH DARK
enviroment, like a fully-enclosed garage at night. It is VERY IMPORTANT
that it be absolutely dark, or you may not see the spark leak. Also, make
sure the engine is fully warmed up before checking (drive it around the
block a few times), as a hot engine is more likely to leak spark. Problem
areas to watch are around the distributor (where all wires fit snugly
together), around the spark plug guards (I removed mine permanently), and
wherever the wires come near anything metal, such as the valve covers.
Running high-octane fuel is just a band-aid for the problem.
Hope this helps ;-)
-- '92 Dak CC 2wd 318 3.55 '84 GoldWing Interstate
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