Awful noise with load/ part throttle only. cannot replicate in neutral

[LukesCougar]

So. my luck with this car keeps getting better. I am wanting to believe this is detonation, but im not very good at diagnostics and this sounds very metallic .. At first i thought it was related to my bad tensioner, but after fixing it the cold start noise is gone and all that remains is the warm/ part throttle noise

I cannot replicate this noise in neutral or high or really low loads, only part throttle cruising with load

i cleaned pcv, checked plugs and theyre all gapped to .054-0.55 but one hole was dirty and the plug felt loose.. cleaned it and it snugged down fine..

cleaned maf and reset pcm.. and i still have a noise.

on a similar note the egr almost looks brand new on the outside but im not sure if its dirty. it is probably what ill check next, but what in the hell would make this noise if its not something internal?

 

[LukesCougar]

 

[Grog6]

I don't hear anything.

 

[LukesCougar]

i have also checked egr and it looks fine.. barely any carbon build up. now im stooped. i havent tried higher octane gas yet though

I was reading a dodge forum that described the exact symptoms and ended up being a lash adjuster. Makes me curious but that isnt work id be doing myself.

 

[LukesCougar]

too much bass? i cant hear it either on my computer speakers. i can with my cell phone

 

[1997ThunderbirdLXV6]

I can hear two noises. One a crickets type noise (which may literally be crickets in the background), and the other a metallic rattle type noise which reminds me of the noise a flag makes in very strong wind.

I'm guessing we're talking about the second?

But the fact that I can hear them doesn't help us because I'm clueless as to what noises mean.

 

[LukesCougar]

I can hear two noises. One a crickets type noise (which may literally be crickets in the background), and the other a metallic rattle type noise which reminds me of the noise a flag makes in very strong wind.

I'm guessing we're talking about the second?

But the fact that I can hear them doesn't help us because I'm clueless as to what noises mean.

the metallic rattle noise is what is bugging me. i may try and take another video.

The current video definitely doesn't do it justice. In person it sounds like one of the pistons is doing a happy dance or a heat shield is violently rattling

i also dont know my noises so im lost. i might lift up the rear and see if it makes the noise just putting it in drive part throttle so i can actually point it out

 

[LukesCougar]

Im still thinking it is valvetrain related maybe? any search with my exact symptoms leads me to a forum of someone finding a bad lash, or valve.

I did read one described as a warped flex plate making noise when load was applied. I have no idea how likely that is for a stock car but i do drive pretty spirited

 

[Grog6]

I've never heard of a flex plate coming loose on one of these.
I've got a friend thats a hypocondriac, looks up lots of medical problems he doesn't have on google. You can find a lot on the net.
ALoose lash adjuster doesn't happen; it spit's out the follower, which makes some serious noise. And bends valves, which are obvious.

 

[XR7-4.6]

I’d drain the oil and check the drain pan for glitter, load dependent metallic knocking noise is indicative of rod bearing


Valvetrain noise isn’t that rapid, keeping in mind the cams operate at half the speed as the crank, and noisy sticky lash adjusters tend to quiet themselves down with engine/oil temp, where rod knock becomes louder

 

[Grog6]

I’d drain the oil and check the drain pan for glitter, load dependent metallic knocking noise is indicative of rod bearing
Rod knock id distinctive, and unmistakable; there should be plenty of examples on the web.

Rod knock gets louder, more insistant, "I'm gonna break now" kinda way.
Detonation sounds like wind rushing leaves around, not scary, like a rod or loose follower. Rod knock exactly follows engine rpm. Valves rattle, and sound kinda like a rod, but more tinny, when the piston smacks it.

Valvetrain noise isn’t that rapid, keeping in mind the cams operate at half the speed as the crank, and noisy sticky lash adjusters tend to quiet themselves down with engine/oil temp, where rod knock becomes louder

Rod knock gets louder untill it ends suddenly with a "TAP-TAPP-TAPsQUeeeaK POW!!! ...AS IT SNAPS OFF.
How do I know, you ask? (lol) My count is 4, so far; two dirt bike, a 2.8l v6 firebird, and now a 4.6.
The teardown on Lazarus will be impressive, I'm sure. 550k miles, hooned daily, at least 6 transmissions, soon to be a PI.

 

[LukesCougar]

I’d drain the oil and check the drain pan for glitter, load dependent metallic knocking noise is indicative of rod bearing


Valvetrain noise isn’t that rapid, keeping in mind the cams operate at half the speed as the crank, and noisy sticky lash adjusters tend to quiet themselves down with engine/oil temp, where rod knock becomes louder

That was kind of my first thought, but i just have been hoping not. If it is a rod bearing why would i not beable to replicate it though? i cannot hear it when the rpms are falling in neutral or revving, and when driving it does it specifically when im at part throttle and nowhere else...?

the only thing i can really compare it to is a massive exhaust leak on my grandpas continental, but still more prominent and this gets worse when hot instead of closing up.

It probably is a rod bearing or wrist pin or something along the lines of, i was just really hoping not. already drained the oil pan not even a month or 2 ago when i first heard the noise and everything looked fine. Used, but mostly clean oil? I even took a magnet through it and couldnt find anything out of the norm and there was barely any metal on the magnet after sloshing it around in the oil for a good minute or so

 

[LukesCougar]

I’d drain the oil and check the drain pan for glitter, load dependent metallic knocking noise is indicative of rod bearing


Valvetrain noise isn’t that rapid, keeping in mind the cams operate at half the speed as the crank, and noisy sticky lash adjusters tend to quiet themselves down with engine/oil temp, where rod knock becomes louder

Well i drained the oil, there is an almost non existant amount of metal, I really can't see anything. Even with a flashlight it didn't look like glittery oil just looked like regular Ole used oil.

Magnet barely picked anything up either.

I'm throwing some 10w 40 in for the summer. Just incase it is something just starting to go out