Dvl4evr Posted February 18, 2009 Share Posted February 18, 2009 About a month ago, I started hearing a clicking noise from under the hood. I looked to see if it was associated w/ the belt or a pulley, and noticed it was coming from the engine itself. Since then, I have unfortunately been able to look into it further and it's gotten a little louder. I've heard of piston slap, but not sure what it should sound like. Can some one please enlighten me?Thanks,Jim Link to comment Share on other sites More sharing options...
Guest azz061 Posted February 18, 2009 Share Posted February 18, 2009 i would take it to LPM or a corvette known shop and get their opinion! Jason at LPM can help! He knows alot about piston slapping!lol Link to comment Share on other sites More sharing options...
goldenC4 Posted February 18, 2009 Share Posted February 18, 2009 If it goes away when it's warm it might be piston slap. More than likely it's a stuck lifter though. Or possibly a broken rocker arm, bent pushrod, etc. How does it run aside from the ticking? Link to comment Share on other sites More sharing options...
lewisbg2400 Posted February 18, 2009 Share Posted February 18, 2009 I'll have to agree with the guy above. A stuck lifter likely or top end problem all together. Link to comment Share on other sites More sharing options...
Eddie44 Posted February 18, 2009 Share Posted February 18, 2009 My C5 had piston slap and sounded like a diesel truck when it started up. As it warmed it quieted down. I put 58k on it w/o a bit of problem. I agree that it sounds valve related if it's doing it all the time and getting worse. I'd run, not walk to a competent repair facility. Link to comment Share on other sites More sharing options...
Robwuk Posted February 18, 2009 Share Posted February 18, 2009 My C5 had piston slap and sounded like a diesel truck when it started up. As it warmed it quieted down. I put 58k on it w/o a bit of problem. I agree that it sounds valve related if it's doing it all the time and getting worse. I'd run, not walk to a competent repair facility. Link to comment Share on other sites More sharing options...
ChadC Posted February 18, 2009 Share Posted February 18, 2009 My C5 had piston slap and sounded like a diesel truck when it started up. As it warmed it quieted down. I put 58k on it w/o a bit of problem. I agree that it sounds valve related if it's doing it all the time and getting worse. I'd run, not walk to a competent repair facility. Link to comment Share on other sites More sharing options...
TheCMSH Posted February 18, 2009 Share Posted February 18, 2009 I have it on my '01, go over to corvettemechanic.com and do a search on it; it's a very common problem and there's a ton of information about it on that site. The premium gas which we have to put in the car is the culprit unfortunately. I use bottle of Techron (fuel system cleaner, not the injector cleaner) about every 4th tank which helps minimize it (carbon build-up), there is a product out there called BG44K which supposedly will eliminate it after a couple bottles of it. I haven't been able to locate it here in Phoenix and honestly haven't pursued trying to order it in from out-of-state as of yet. It's not a death sentence for the car but you should monitor the situation. Hope this helps Link to comment Share on other sites More sharing options...
Jason L Posted February 18, 2009 Share Posted February 18, 2009 80% of the time its because the cylinder hone isn't all the way true and when the pistons cold it slaps around in the bore. I had 2 01's that did it and a 99 F body. There are other things that can cause it best thing to do though is have someone take a look at it and see what the noise is. Could be valvetrain related as well but its hard to tell unless I hear it in person.Jason Link to comment Share on other sites More sharing options...
anmracing2 Posted February 18, 2009 Share Posted February 18, 2009 Maybe it's an injector.......Andrew Link to comment Share on other sites More sharing options...
Guest Sidewinder Posted February 18, 2009 Share Posted February 18, 2009 We also have a small borescope we can remove the plugs and see any scoring on the cylinder wall, you hafta know what your looking for though it's not like scratches. That would tell ya without a doubt what it is. I had it on my '02 and now I can hear it on other peoples cars from a mile away. Link to comment Share on other sites More sharing options...
Dvl4evr Posted February 19, 2009 Author Share Posted February 19, 2009 Thanks everyone for the replies. The sound doesn't go away as the car warms & my first thoughts were of lifters. But I'm no expert so I'll get it in ASAP.Thanks again!Jim Link to comment Share on other sites More sharing options...
Guest Sidewinder Posted February 19, 2009 Share Posted February 19, 2009 Thanks everyone for the replies. The sound doesn't go away as the car warms & my first thoughts were of lifters. But I'm no expert so I'll get it in ASAP.Thanks again!JimShould be easy to diagnose to a trained ear. Link to comment Share on other sites More sharing options...
anmracing2 Posted February 27, 2009 Share Posted February 27, 2009 So what's the deal???? Did you find out what it is??????? I haven't been on the forum for a while so I was just wonderin'....... Link to comment Share on other sites More sharing options...
Dvl4evr Posted February 28, 2009 Author Share Posted February 28, 2009 Ok, so I'm quite embarrassed about what the issue was. It seems the #7 spark plug wasn't torqued down enough & the compression was pushing it out every time that cylinder fired. Good news is that it only took them an hours worth of labor to figure that out & take care of the problem! Link to comment Share on other sites More sharing options...
Guest Sidewinder Posted March 1, 2009 Share Posted March 1, 2009 an hour? Link to comment Share on other sites More sharing options...
anmracing2 Posted March 2, 2009 Share Posted March 2, 2009 Andrew Link to comment Share on other sites More sharing options...
Bigfoot Posted March 2, 2009 Share Posted March 2, 2009 an hour?That's just the labor they charged him. You run a shop, you know how it is. ;) In all acutality they are supposed to charge what the book says for time. i.e. if the book says 1.5, you charge 1.5 hours even if it took 3 hours or 10 minutes. Link to comment Share on other sites More sharing options...
anmracing2 Posted March 3, 2009 Share Posted March 3, 2009 Which means it was a 5 minute job so the customer gets screwed and pay for an hour and half. So lets just tell the customer it took an hour to make us feel better about charging them........ Seriously though, glad to hear it got fixed!!!!!!!Andrew Link to comment Share on other sites More sharing options...
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