Help weird engine tick/slap (Vid) updated kinda

[BlackonBlack89]

Here is the noise. Its a cell phone but it pretty damn good. A little louder than real life but I think it becasue it close to the engine


This 91 has been has been a handful of little problems.(I like my 89 alot better) The rod knock is gone since the rod bearing were changed less than 400 miles ago and now it has thicker oil (peace of mind). So i know it not rod knock plus the noise if from the top end somewhere. I think its from the driver side but can't tell if it front or rear. I swear it is coming from back but it sounds like it could be either or. Weird

Now here what happened.... after I/my dad did the rod bearings, we Started it up let it idle than it started making this noise just 2x as loud. Then after a few minutes it started to get quiter but then leveled off and now sounds like it does now. After we added some lucas oil stuff(can remeber the excact name but good stuff) the noise went away. Stayed away for almost 400 miles and now just came back. Now today on the way home It just started again.
I have no explaination for the coming and going of this noise. I think it might be the cam chain slapping the VC but i am sure so I figured I ask u guys before I dug into her for the 4th time. LOL

I do not know the history of the vehicle so could a lack of a valve adjustment cause this sound???


Help me figure this out!!!!

 

[Calypso]

Don't know, but it doesn't sound good. That's almost the same sound as NeedAPartsCar's was making before/when his engine went. Don't know though. Try pinpointing the exact location of the noise by using a screwdriver.

 

[sccolbert]

sounds like a chain on a valve cover to me...

 

[Calypso]

sounds like a chain on a valve cover to me...

That's what I thought when I read the post, but it's not coming from the right area, at least, doesn't sound like it. My 1993 had a bad cam chain tensioner and it didn't sound like that at all. a little softer and more random...

**EDIT** Can you hear it from inside the car at all? if you can, chances are it's not the cam chain tensioner, that doesn't make that loud of a "tapping."

 

[BlackonBlack89]

sounds like a chain on a valve cover to me...

I think so too but I also think maybe it could be a timing belt tensioner as I searched for a while and those two things sounded like my symptons. I just cant tell where it coming from. I swear it sounds like it coming for the middle of the enigne.

I think this weekend I will find out for sure. I am gonna have to baby it to work tommorow I guess.

I just started the car again and the video makes it sound so much lounder than it is (FYI). barely here it in the car (at idle) but hood open you know its there.

 

[BlackonBlack89]

That's what I thought when I read the post, but it's not coming from the right area, at least, doesn't sound like it. My 1993 had a bad cam chain tensioner and it didn't sound like that. a little softer and more random...

**EDIT** Can you hear it from inside the car? if you can, chances are it's not the cam chain tensioner, that doesn't make that loud of a "tapping."

Barely at idle. Rev yes but the windows are down hood open BTW

 

[Calypso]

FWIW, I couldn't hear the chain tapping from inside my car at all. I'd think your better bet would be to check the timing belt. I guess if those go out, they can cause tapping, sometimes. Just make sure there is no slack in the belt at all. Good luck figuring it out

 

[SASHO91]

You said, "The rod knock is gone since the rod bearing were changed less than 400 miles ago " ....Soooo the car had a spun bearing before and you put new bearings in?

EDIT: just watched the video... that's something in the bottom end.

 

[BlackonBlack89]

You said, "The rod knock is gone since the rod bearing were changed less than 400 miles ago " ....Soooo the car had a spun bearing before and you put new bearings in?

EDIT: just watched the video... that's something in the bottom end.

It never spun, just had a rod knock . It had a knock which sounded alot different than this new sound. A rod knock does not just go come and go either(atleast I have never heard of it happening). I really dont know what it is. My father thinks it might be valve tap. So who knows I really dont know what to do right now. I may just park it and figure out what I want to do with it.

 

[Calypso]

I'm with SASHO91 on this one. I've said it before, but that's the same sound that was coming from my buddies engine when his went. They guy that bought it from him compression-checked the cylinders and I think like 3 of them weren't getting compression. Motor was shot. I'd say compression check before you do anything else, or pull the intake/valve covers and have a look.

 

[Racer X]

Pull the valve covers. You either have a worn/ failed chain tensioner (better news) or you threw a shim (start looking for cams and a new shim bucket).

 

[K-Dawg]

I dunno Justin, I think it sounds an awful lot like rod knock if you ask me. Pull the valve covers just for the **** of it, but I don't expect you'll find much wrong.

 

[93MTXSHO_STUD]

i second the rod knock... I had a slight rod knock before I changed the bearings. Sounds like a louder version of what I had. Though I wouldn't throw out the shim or chain theory, though I wouldnt know what the bad chain would sound like. I would recommend getting under your car while its running and listening at the oil pan to see if it gets louder. Screw driver tech. is classic to finding problems as well. Valve covers are prolly a bit easy to take off that the oil pan, id start there.

 

[BlackonBlack89]

Ok this is really weird.
I just drove the car to my dads(5 miles) and when I started it, the nosie was there but not constant but there. ok w/e. Well I am driving car and listening. The sound was GONE.(after maybe 1 mile or so) I have no freaking clue why. Didn't do a thing except not drive it for a day. It now sounds perfect.

It is NOT rod knock. Cant be. If you heard the sound in real life I think you would agree and understand why.It something up top. But the sound comes and goes.(like for a long time, then comes back) Its just weird. Engine feels strong like it still can go all out. plus the bearing are brand new. So I will find out soon when I pull the VC but it wont be this weekend hopefully next weekend.

 

[ShadetreeSHOguy]

erm, that sound sounds sickenly disturbing to me. You wouldnt have put in BBB's by chance would you. a familiar 90 that i know had that same sound and it had sucked in a butterfly screw

 

[SHO92]

I heard a similar noise on a 3.2 that had the pistons smacking the valves.

 

[Calypso]

I'm still leaning on something not good. My friends (this is getting a bit repetitive) had that same noise coming, and at the same "speed" or whatever. While we were trying to diagnose it, the sound went in and out, then was completely gone for a while. Then it came back and stayed. We later pulled the intake/valve covers and managed to pull out a piece of metal from one of his cylinders, using a magnet.

My thought: you may have had something small rolling around in there that eventually got sucked out one of the valves or jammed in something, but that may be unlikely.

I know you're already going to do this, but when you have the intake and whatnot off, see if there is anything in the cylinders and make sure all of your butterfly screws are there. Try using one of those magnet stick things to see if you can pull anything out of the cylinders. Better yet, if you have access to a borescope, see if you can see any marring on the inside of the cylinders to see if anything had been in there, or is in there.

Hopefully it's nothing serious, but going based on what I can hear from the video, it doesn't sound like anything in the cam/chain area (but I don't know what a thrown shim sounds like). Then again, if it was something really serious, I don't see how the sound would just go away like that.

Weird.