Can any one tell if this is an engine knock or something else ? the motor has only 61k miles on it I already drained the oild to look for any metal but it is very clean http://home.comcast.net/~momto4boys/MVI_0935.AVI

[This message has been edited by ig88vsbobafett (edited 01-20-2006).]

that engine is ****ed. Sorry dude.

You've got virtually no oil pressure and a bad knock. Dont expect that engine to last for very many more hours.
What's more, if you throw a rod, you'll likely end up with oil splattering across your hot exaust system. Then the Fiero becomes Fire-o.

[This message has been edited by Jax184 (edited 01-20-2006).]

It sounds like you got a little guy inside there with a jack hammer!!

Can you say "Time for a new one"?

Woo-hoo! Love that sound: it means it's time for an engine swap!

I'm not quite as pessimistic as the others. Before I'd throw the engine away, I'd do a couple more tests. One of the posters said that you had very low oil pressure. I don't know how he knows that, but if you do, that's a pretty good indication that there is too much clearance between some moving parts - not a good sign. From the recording, I couldn't tell for certain that you have a rod knock; it could be something as simple as an exhaust leak. Check that out by sticking a piece of tubing into your ear and probing the other end around the exhaust ports on the engine - and at other locations on the exhaust system. If you determine that there is no exhaust leak, then pull one plug wire at a time, and see if the knock goes away - usually a rod knock will get much quieter when the load is taken off that cylinder by eliminating the spark.

Good luck.

I am 100% sure its not an exhaust leak

As for the low oil pressure, you can see it for a moment at the end during the interior shots.

Yea, you're boned.
Why no voltage also?

When you look for metal in the oil, you're not looking for actual pieces, watch the surface as it pours, under a light, you should be able to see a goldish film moving across the top. I really doubt there isnt something there with that kind of a knock.

I don't think it is a rod. A rod does not knock like that under pressure. It knocks under no load. A main bearing knocks like that under load, but your knock is too much for a main bearing, So my guess is that it is something else. Sounds like something has come loose and hitting the oil pan.
Don

sounds to me like a bottom end bearing(rod or main)...if i were you before i take the engine out, i would take out the oil pan and check. go through and wiggle the rod caps...with a knock like that..one of em is wayyyy worn and should wiggle around alot. other than that, i guess you just need to take the motor out,dissasemble and find out where that knock is coming from. hate to say it but to me....that motor sounds about gone. it could possibly even be a wrist pin but it sure sounds like a bottom end knock.

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Keith
Topsail Beach,NC
86&87 Fiero GT
86&96 Corvette
04 Harley Davidson Softail
73 Lotus Europa Twin Cam
86 Lotus Turbo Esprit

"He who dies with the most toys wins!!!"

I'm not entirely sure it's "terminal" Hard to tell from the vid, but it just doesn't sound like a heavy enough knock to be in the bottom end. It also sounded like the noise got louder when you pointed the camera at the tranny.
Is it possible that one of your pressure plate bolts has come unscrewed and is hitting the inside of the clutch housing? I've heard of loose torque converter bolts causing a clatter like a bad rod bearing. (Has your clutch started to chatter or otherwise act funny?)
Do you have a mechanic's stethescope? If not, a big screwdriver will work. Poke around and see if you can isolate where it's coming from.

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Raydar
88 3.4 coupe...........

Praise the Lowered!
Read Nealz Nuze!

quote Originally posted by Raydar: It also sounded like the noise got louder when you pointed the camera at the tranny.

Most video cameras have their microphones mounted to the tops, so it would be very close to the engine when the camera was looking down.

Yeah that's about what my duke sounded like when it lost a rod bearing

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1984 Fiero SE

Rod knock for sure. Pull spark plug wires one at a time and run the engine, when the knocking subsides you've found the cylinder.

JazzMan

quote Originally posted by Raydar: I'm not entirely sure it's "terminal"

Y'all are probably right. I'm just one of those "never say die" people. Sorry.

Let us know what you find by pulling the spark plug wires one at a time. Also did this knock just start or has it been there and just getting louder and louder?
Don

My Engine used to do the same thing about a year and a half ago, sooo i starting putting in the highest octane gas and it went away and the engine is still running fine to this day, I have a 84 2.5L with 120,000 miles

Dammit Jim, im a mechanic not a doctor. If it was a loose rocker arm wouldnt he have a hard constant miss as one of the valves would not be opening? Its purring like a kitten. Also if it were detonation, I would think it would not sound sloppier when he revs it, and possibly be intermittant. Ive spun enough bearings to know that sound. Its a little too sloppy to be a main, lol Ive ruined enough mains and spun enough rods to be able to tell the diffrence, thats just freakin sad....

Not to say these people are wrong, just offering my opinion, obviosly not being there first hand it is a little harder to diagnose

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Boost is like Venerial Disease, one night of passion can result in weeks of pain (and work.)
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quote Originally posted by kmerkle01: My Engine used to do the same thing about a year and a half ago, sooo i starting putting in the highest octane gas and it went away and the engine is still running fine to this day, I have a 84 2.5L with 120,000 miles

In your case, you probably had actual pre-ignition. High octane gas would prevent that, but not change a rod knock. Now the Iron Duke that you have shouldnt be "pinging" at all with even the cheapest of gas, so you might want to check things like your ignition timing and EGR system. With gas prices what they are, I'm sure you'd rather not have to pay for more than you're getting.

Check the oil pan for dents caused from a jack or objects in the road. It sounds like something hitting the pan such as the rod cap.
Don

The nature of rod knocks is that they are loudest with RPM and, more importantly, loudest with load. If the knocking varied only with RPM and didn't get quieter as you coasted the engine down then it might not be a rod, but in this case you can clearly hear the knock get louder with throttle, louder with RPM, and quieter as you closed the throttle. The extra push on the piston when the engine is under load makes the knock louder.

A valvetrain problem would be more "clackier" than what you've got, to some extent.

Do the wire test anyway, just to isolate it to a cylinder.

JazzMan

quote Originally posted by JazzMan: The nature of rod knocks is that they are loudest with RPM and, more importantly, loudest with load. If the knocking varied only with RPM and didn't get quieter as you coasted the engine down then it might not be a rod, but in this case you can clearly hear the knock get louder with throttle, louder with RPM, and quieter as you closed the throttle. The extra push on the piston when the engine is under load makes the knock louder. A valvetrain problem would be more "clackier" than what you've got, to some extent. Do the wire test anyway, just to isolate it to a cylinder. JazzMan

I have been wrong for a long time, because I was taught in auto school that a rod knock would knock more when not under a load and a main bearing would make a knock under a load.
All the rod knocks I ever heard were under steady throttle like cruising at a steady speed. But I am glad to know what you say, because I know that you are a good mechanic. Also the mechanic that tested my 84 Pontiac on the recall, pulled each wire and said if the rod was loose that removing the spark wire would cause it to knock. No offense, just trying to clear up my mind.
Don

[This message has been edited by ka4nkf (edited 01-21-2006).]

quote Originally posted by Steven Snyder:

I said he's "boned" not bones

Sounds a lot like a spun bearing caused by low oil pressure - that's what my 2.8 sounded like when it spun a bearing. I drove it for three months like that before it broke I think it's time for a 4.9.

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1986 Pontiac Fiero GT 4.9.. IT RUNS!

quote Originally posted by 86GT3.4DOHC: I said he's "boned" not bones