i have a 98 z28 sometimes i hear a knock. not really sure where its coming from i know i have a bent pushrod. i will be doing my valvetrain this winter. its wreid because it don't knock all the time. i just hope its not a rod knocking. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

 

i don't ask that hard of ?'s do i?

 

Is it just when cold? Or just when hot, or what? How is the oil pressure? Stock cam? Stock valvetrain?

 

it does it cold and when it gets hot and yes its stock. and oil is around 25.

 

can anyone help here? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

 

Need to have more details . . .

Can you describe the sound exactly? Is it a deep dull clang? A ticking sound? How does it change under load?

Also, how is your oil pressure? Does it stay stable or does it get real wobbly/unstable at times?

 

oil pressure is arond 25 and is stable.its more of a ticking sound and under a load it go's away.let me know if u guys need anymore info about it. the car also shakes more than it should it like its missing out. but isn't throwing any codes. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

 

My '98 z28 did the same thing, but oil would dip below 20 in idle. Is that what you mean, 25psi in idle or while driving. It should go to around 40psi while driving. The '98s had bad oil pumps, by now your engine might be toast. That could be a bad bearing. In fact if it is a clanking sound that speeds up as you drive, it is a bad bearing. If that's the case then shut it down and don't start it again until you find out.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by rocketsled:
<strong> oil pressure is arond 25 and is stable.its more of a ticking sound and under a load it go's away.let me know if u guys need anymore info about it. the car also shakes more than it should it like its missing out. but isn't throwing any codes. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">well if it goes away you might have tweaked the bearing a little. That's what I did 10,000 miles ago, and guess what. My car has a new motor in it. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

under a load it run around 40psi and idles a 25psi. and u don't here the ticking all the time only during start up.i listened to it to day is sounds like its coming from the heads. not the crank case.

 

good news guys. its a lifter so when i have my cam done. i well replace the lifters. i glad it's not a rod. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />