My pinto,2.3 liter 4 cyl, has started to make that rattle sound I guess its spark knock or predetonation. At night it doesnt do it,I think because the air is cooler.
It never did it before,but I did recently redo the carb top half,so it could be running lean or leaner.Thats the only recent change I could connect it to.
Is it likely to be that,or the cold air intake not being on it and it getting under hood air all the time?
Or would it be more likely the spark plugs are too hot? Cooling system problems?