Lifter tick? or what?
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check to make sure no spark plugs are loose. I had one like that forever and didn't figure it out until it fell out! The ticking was afwul and I kept looking for some type of exhaust leak.
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you ever add some lucas synthetic oil stabilizer i think thats what its called, but it helps with lifters and seals. Might wana do that next oil change add a quart of that into your oil and see if it helps.
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Lifter probably. That happen to me at 150,000 miles. I was passing this car and I punched it. Next thing I knew whenever I slowed down from 130 mph I heard this tick tick tick. I came from the driver side valve cover. First thing that following Monday morning I took it to my speed shop along with my new assembled heads, cam, oil pump, water pump, push rods etc. EVERYTHING from the block up I needed except lifters. Well, turns out a lifter went bad ******* up push rod and digged my stock cam some awful groves in it. Replaced them with LS7 lifters.
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I had good oil pressure with the bad lifter too. No SES light or anything. My car is a 2000 model too. The lifters and the push rods on these cars werent the greatest. I felt the same way when it happened. I was lucky had been collecting parts and everything except for the lifters. AND of course the $$$ to have it done plus the tune.