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I have a friend who had a '91 Honda accord and he burned a hole in his piston because he drove too long with the EGR chamber clogged. I don't know if you have any check engine codes for the EGR lift, but if you have a code that occasionally comes up, it's because the chamber is clogged since the older accords do not have a way to measure EGR flow. There is a guide floating around that I can send you which shows the procedure for cleaning the EGR chamber which btw isn't that trivial since Honda didn't make a removable chamber until '94. (You have to port holes, clean the holes, then use a specific Honda plug for these holes)
Let me know.
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