I thought I had a colapsing lifter on the drivers side. Well I replaced all the lifters and pushrods, and I heard the tapping sound again today. It gets really loud for a couple of minutes, then it goes away. It doesn't matter if I just got on it, or if I'm driving normally. What else can it be????

TIA
John

 

Do you still have the A.I.R. system on the car? I had the check valves in those tubes that attach to the headers replaced because they were noisy. Sounded just like a lifter for a few seconds then went away. The evap solenoid that runs underneath the driver's side fuel rail can also be mistaken for lifter noise.

 

Hey Jake, I don't have the A.I.R. system anymore. I took all that stuff off.
And as far as the solenoid, you're talking about the solenoid with the red connector on it right? I unplugged that when I heard the tapping sound, and the tapping was still there.
So I'm clueless!!!

Thanks for the replies.

Anyone else have any ideas??

John.

 

I have an idea, but your not gonna like it. This happened to me, I had similar symptoms as you, the tapping sound would come and go, kinda wierd. Anyway, it turned out to be a spun rod bearing for me. Drain your oil and see if there are any metal shavings that come out. Hopefully this is not what it is, but just an idea for you...

Dan

 

He is right about the possibility of a spun rod. Mine made the same sound when I spun one .didn't sound like any spun bearing I had heard before. In my case it was the piston actually hitting the head. Didn't do any damage to the head or piston but you could see where they touched. It sounded like the pushrod was hitting the valve cover to me at the time.

 

<img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" /> <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" /> <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" />

So, if it was a spun rod bearing, wouldn't it tap all the time? If it's spun, it's spun, right?

 

TTT

Anyone else have any ideas??

And it's more of a ticking noise than a tapping noise. Almost like an exhaust leak. And it does seem to be RPM related. By that I mean, after I get on it one good time, the ticking appears(It doesn't happen every time I get on it either). Then after a few minutes, it goes away. It's a very pronounced tick right after I get on it too.

TIA
John

 

John, like I said above, it did not tap all the time. I originally thought it was a lifter bleeding out like you did. The noise mine made was like what a bent push rod would sound like. My noise would start kind of faint, then get a little louder, and would adventually go away if I lowered the RPM. I'm not saying this is your case, just something to look at. Drain your oil and find out...If you already changed the oil and didn't look for metal shavings, then I don't know. Good luck to you though!

Dan

 

Thanks Dan, I'm gonna change the oil in the morning and I'll look.

Let's just hope it's not a rod!!!!

John.

 

Have you missed any shifts?? I pulled a bonehead move and ripped the infamous 1-2-3-2 shift sequence awhile back and would hear an intermitent ticking like you are describing. I thought that I had tweaked a pushrod, so when I took it to the dealer I expected to be told that the pushrods were replaced.

Turns out that it was the timing chain. I had stretched the chain, and as a result my valve timing would vary. With the timing chains being a notorious weak point on these motors, it may be worth checking out on your car.

Good luck.

 

mine was intermittent at first too. I am not saying it is a spun bearing just a possibility. I would drain the oil and look for shavings (small aluminum flakes)

 

I haven't missed any shifts lately, and I put a double roller timing chain and gears in when I changed the heads and cam.

I'm gonna change the oil tomorrow. When I do, I'm gonna put back in 4 qts of oil, and 2 qts of transmission fluid. There may be some oil galley passages in the block clogged up, so I'm gonna run this combo for about 100 miles to clean things up in there. We'll see what happens.

Thanks again for the replies guys.
John.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Johns98Z28:
<strong> I haven't missed any shifts lately, and I put a double roller timing chain and gears in when I changed the heads and cam.

I'm gonna change the oil tomorrow. When I do, I'm gonna put back in 4 qts of oil, and 2 qts of transmission fluid. There may be some oil galley passages in the block clogged up, so I'm gonna run this combo for about 100 miles to clean things up in there. We'll see what happens.

Thanks again for the replies guys.
John. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Does this noise happen at every start up and die out after engine warms up? Is it worse on colder days? I may have same problem. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

 

John best way to analyze oil is by cutting open oil filter and examine paper media for bearing or whatever. I dont know about your trans fluid idea, if it were me i wouldnt do that. How about Marvels mystery oil?

 

CamaroSS, it doesn't happen at start-up. When it would happen would be when I got on it real good. And it wouldn't happen all the time either.

LS1derfull, the trans fluid trick was recommended by Jay from Absolute Speed to clean the internal oil passages of the block. He recommended that I put 4 qts of non-syn oil, and 2 qts of trans fluid, run it for around 100 miles, not getting over 3500RPM or getting on it real hard, then change back to the regular synthetic oil that I normally use. I've got 50 miles on this oil/trans fluid mix right now.

I did notice when I drained my oil to do this fluid mix, that the oil filter looked like it was in bypass mode. Does that make any sense? The holes around the main opening on the oil filter were closed off by the gasket inside the filter itself. Why would that happen??

 

i had the same problem after installing gtp heads and cam the noise was coming and going it was ended up being a spun rod bearing

 

Ive been doing the trans fluid thing on my cars for years. I usually dump a quart in the engine the same day I plan on doing an oil change, do what ever running around I'm gonna do, then change the oil at the end of the day. My current beater truck, which I bought new in 93 has 151k on the clock, has never leaked any oil, screwed up any pressure switches, and had zero mechanical problems. I do this every 10k miles or so, and change the oil every 90 days, regardless of the miles.
I have been wondering about doing this with my LS1 engine, but didn't want to mix syn with dino in the crankcase.
the reason I started putting trans fluid in my engines was because I learned that trans fluid is basicly a base 5w oil, treated with anti-foaming agents and loaded with detergents. when I was rebuilding diesel engines, the black carbon from the internal parts was imperviouse to any hand soaps on the market, so me and the guys in the shop used trans fluid to pre-wash our hands, and the finished up with gojo or something. it was the only way we could get the carbon black out of our cuticals, fingrnails, etc. I haven't done any research on synthetic trans fluid, so I can't speak on that.
IMO, the results speak for themselves.
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

Okay, I changed the oil in my car this morning. I put back in the combo of Mobil 1 10w30, and 15w50, and replaced the oil filter. Everything sounded good for a little bit. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

The ticking started up again. This time it hasn't gone away yet. And that was at 2:00pm today. So I guess the only thing it can be now is a spun rod bearing <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" /> .

Does anyone have the part #'s for the main bearings, rod bearings, and rings. If I'm gonna pull the motor, I might as well freshen the whole thing up. Too bad I don't have the money to add a few cubes to it. <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />

Thanks for your replies guys. I had a gut feeling that it was a spun rod, but I didn't want to own up to it. Thanks again.
John.

 

did you try a leak down test on the side that is ticking ? it could be a bent valve

 

No, I didn't do a leak down test, but when I replaced the lifters a couple of weekends ago, I checked the heads and they were okay.

The ticking sound sounds like it is coming from the center of the motor. When you get down on the ground to listen, it gets much louder under the car. Does this still sound like a spun rod??