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Re: Engine Problem - Help!
Very possibly the same thing that caused me to put a new engine in my '94 a year ago.
According to what I have read and found out since my own problem, it is not uncommon for these engines to drop the valve seats after a certain age.
You can do a couple things... and since nothing else is evident you may not have any other choice.
If you are up to it you can pull off the intake manifold. Try to blow it out with an air copressor and see what kind of debris comes out. If you find small bits of metal it is probably from the valve seats, which means you are in deep doo doo.
Second is just an extension of the first... go ahead and pull the whole head off and inspect the top of the pistons and the bottom of the head. If you find your piston heads pitted out... or good chance a piece of metal has been smashed onto the top of a piston causing the knocking sound... then you have found your problem. If it is all clear and the head checks out, breathe a sigh of relief.
The damage to my engine was extesnive enough that I opted to buy a new engine. If your valve seats dropped you may or may not be able to reuse the head... mine was toast.
If this is your problem, when it comes time to put it back together be absolutely certain that you have cleaned the engine out completely or else metal debris will find its way back in there and cause the same problem... this goes especially for the air intake. Clean that sucker out good.
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