Ticking/rattling coming from the valvetrain *Video
05-25-2008, 08:39 PM
#1
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Ticking/rattling coming from the valvetrain *Video Ok, so it's been making this sound since a trip to the track about a month ago. The track runs went badly (mechanical overrev, launched at too high of rpms, hit the rev limiter), so I know I messed something up, but I need some help diagnosing before I dig into the valve train for the first time.
It's a rattle type sound when the revs come down, and a ticking on cold starts. The ticking goes away, so I think it's just piston slap (which just starting happening after the track runs). But the rattling is always there. My oil pressure jumped too, now it's between 50-60 at idle (instead of ~40 like it was before the runs). From the video, it seems to be worse on the passenger side, but in person it sounds like it's coming from both sides. Any help is appreciated, thanks!
It's kinda hard to hear in the videos, but it's that rattling that starts right when the revs come down. It's a lot louder in person.
You can hear it really well at :22
It's a rattle type sound when the revs come down, and a ticking on cold starts. The ticking goes away, so I think it's just piston slap (which just starting happening after the track runs). But the rattling is always there. My oil pressure jumped too, now it's between 50-60 at idle (instead of ~40 like it was before the runs). From the video, it seems to be worse on the passenger side, but in person it sounds like it's coming from both sides. Any help is appreciated, thanks!
It's kinda hard to hear in the videos, but it's that rattling that starts right when the revs come down. It's a lot louder in person.
You can hear it really well at :22
05-25-2008, 08:45 PM
#2
It is a little hard to hear in the video, but when I hear "overrev", I immediately want to suggest checking pushrods. Bet you've got one (or a couple) with a slight bend to them.
This is what mine looked like (left is ok, right is shaped like a banana).
This is what mine looked like (left is ok, right is shaped like a banana).
05-25-2008, 09:33 PM
#5
bent pushrod my guess due to the overrev, but I get that sound too, with mine it's a lifter that kinda deflates under particular situations, I can run it hard at the track then on a normal drive give it a little or almost stall it and that blip of low pressure is enough to get it started. Idle for a min or 2 at a light and it'll be back to normal, but it WILL do that on my car every once in awhile. I have hardened pushrods too.