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Hello, I am Denny another Chaparral owner that is looking for more then the Chap. Forum has to offer.
I have had my 1985 XLC 235 trailer queen since 1992
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Hey Jim. Hope you are feeling better and can get back online real soon. Miss ya man. Take care.
So, maybe this is an ignition issue? slowly increase rpm, no knock, goose the throttle, and you get a knock? Is the advance working properly? You say you degreed the cam, but is the crank marker correct? Is the advance working smoothly when goosing the throttle? Is this a TB-IV ignition? Module could be doing funny things, or the pickup. Inspect the cap and rotor?
We test ran with 93 and 1/2 pint outboard oil and got the power back BUT developed a hi rpm under load knock from either 6 or 8 .Raise the idle slowly up to 5 k and you dont hear it, raise it quickly no load and it clanks.As little as 4 deg makes it disappear no load.customer said it happened powering up . Will have a update as soon as I get it to take apart AGAIN.