Possible lifter failure? Need some opinions...
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Possible lifter failure? Need some opinions...
Every time I start up my car when it's cold and I let it warm up, at about ~100 degrees there is a really loud slapping/tapping/knocking (however you wanna describe it) and you can even hear it with the windows up and radio on. It lasts for only about 20 seconds then goes away and the rate of tapping will increase with rpms. It is coming from the driver's side of the engine. I think it might be a lifter. Im not too concerned with it since it goes away pretty quickly and doesn't affect performance. It has been going on since the summer. I changed from Mobil 1 0w-40 to Amsoil 5w-30 to see if there was a difference but there was none. I even made a couple passes at the track last night and everything is still ok. Does anybody have any ideas and is this anything to really worry about? Thanks.
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same here........... It has been doing it since 8 - 10.000 miles has 36k on it now hasn't gotten better or worse. It has been refered to as cold start knock piston slap ect. it is just an annoying noise I may see if I can get it on vid and post it
Last edited by formula87; 11-24-2007 at 12:52 PM. Reason: did not finish writing
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and to answer the op its nothing to worry about they all do it if its cold enough just let it warm up
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Ok thanks guys, I just needed some reassurance. I didn't think it was piston slap just because it just recently started doing it out of nowhere, but guess it sounds like it's no big deal.
#9
It lasts for only about 20 seconds then goes away and the rate of tapping will increase with rpms. It is coming from the driver's side of the engine. I think it might be a lifter. Im not too concerned with it since it goes away pretty quickly and doesn't affect performance.
Did a google search and seems they still make the stuff:
http://www.autobarn.net/ch100-qr.html
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My car made exactly the noise you describe. I was hoping it was maybe a bent pushrod, but its not, so I am puting new lifters in along with my cam swap. However, the lifters that came out seemed to be in fine shape unless the internals were gummy, but I doubt it the rest of the motor was really clean. I guess Im saying, just live with it.
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Tell them it's a new brand of hybrid techchlorabate lifter set that sets off minute explosions to raise the ratio 1/1000 to where our cars perform better with the optimum pydanomide tune with the latest software not available to the public.
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You might be right about it being a lifter. Used to be that regular flat tappet style lifters would sometimes have the internal workings get gummed up. The use of Rislone was typically the thing to try and free things up. Since hyd rollers have the same type of internal workings, same thing could happen, but is probably not nearly as common with todays better oils.
Did a google search and seems they still make the stuff:
http://www.autobarn.net/ch100-qr.html
Did a google search and seems they still make the stuff:
http://www.autobarn.net/ch100-qr.html