98 rodeo w/ engine knock
I recenlty purchased a 98 rodeo, 3.2 v6 w/ 88,000 miles. Everything is great except an engine knock/rattle between 2500-3000 RPM. The sound, and the RPM that it appears varies depending on how hard I am accelerating. Sometimes it sounds like valve "clatter", leading me to think it is related to ignition timing, and sometimes it sound like a "knock". CEL has not come on.
I have:
changed to NKG spark plugs (sound changed somewhat)
cleaned the EGR valve
replaced PCV valve
cleaned top end w/ sea foam (sound changed again)
I am planning to put a real oil pressure guage on it to check the oil pressure, but have not yet.
Questions:
should I get a CEL if: knock sensor, or EGR valve, etc. is bad or if timing is not being advanced/retarded correctly?
What else should I check? timing belt?
Boy do I miss distributors with a set of points.
Thanks,
David
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