99 ls1
99 ls1 I have a 99 ls1 in a TransAm and when i start it up the lifters make noise for about 3 to 4 seconds. Oil and filter are new. Old oil was clean every time i have changed it. Car runs great and has about 40 psi oil press at idle hot. Got any ideas?
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Joined: Oct 2009
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Mine has terrible lifter noise at start up too, if i run it hard then its really bad the next time i start it. After a oil change it really rattles, I have 40+ oil pressure at idle hot, car runs ok. Its more of a rattle than a tap in mine, i actually think i'm hearing the rockers tap on the valves until the lifters pump up with oil completely. I also have the piston slap noise but that you can't miss, its a klacking knocking noise that goes away after it warms up.
If i drive it easy for a few 100 miles the noise goes away completely, then if i run it hard it comes back. I guess gm has some lifter issues.
If i drive it easy for a few 100 miles the noise goes away completely, then if i run it hard it comes back. I guess gm has some lifter issues.
