There's a rattle that seems to be coming from the cam gear area on the rear bank of the 2.5L HO on my '98 CSVT. Lately it's developed a little bucking noticeable up to about 2500RPM.
I had the codes read last week, and it showed that 1 and 3 were misfiring some. CEL was on, but it's been that way for a long time due to slightly out-of-spec cat. CEL is not on now.
I replaced wires on 1 and 3 (doing the rest when convenient) to see no significant improvement. Is the timing chain worn out? cam bearing shot? Chain tensioner loose? Engine has very high miles, but it's been bulletproof reliable to date. I've run full synthetic 5W-30 since second oil change. Car was built June 1997 as an early '98; I bought it new.
Sideline -- From reading other posts, I think the secondaries are not opening all the way, but that's been the case for over a year.
