I have heard the same thing about carbon build up. Might run some Sea
Foam through it to clean out the carbon. I find it at the auto parts
stores for less that $6.00 a can. A lot of us motorcycle riders use it
with good results. Just a can put it in the tank and use the octane the
car calls for.It might take a couple of cans/tanks to clear it out. Or
it could be a knock sensor, if the car has one which adjusts the timing
when it senses the pre detonation. Another good one recommended by a
Volkswagen mechanic it a product made by Chevron called Techroline
(sp?). It might be easier to find.
Common problem of pinging on earlier 90's version of this 4.6L engine was
soft carbon clogging EGR passage below the throttle body adapter to intake
Fix is not too difficult for DIYer and is free if you are able to reuse
gasket. Remove the TB adapter from the manifold and clean it out.
Joel Ryan wrote:
Hey, not that this'll help.....but who knows
I have an 83 grandmarquis, 302, efi. And sometimes it gets crap stuck in
the EGR valve, too...ever once in a while we just take it off and blow it
out with the old air compresser.
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