Hey Goblin, read the whole thread. Insightful, was wondering if you're still running with the slap knock?
Help Diagnosing Engine Knock
- Thread starter The Goblin
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- engine knock flex plate
Hey Goblin, read the whole thread. Insightful, was wondering if you're still running with the slap knock?
brewtus98
TJ Enthusiast
This is what mine sounds like after I did a bottle of Marvel Mystery Oil... I haven't heard another Jeep ticking this bad yet
Does that go away after warm-up?
oconnef
Member
I know this is dated, but wondering if you dug further. That's dead on what mine sounds like and forgiving anyone that's read the entire thread, I've replaced:
Oil Pump Drive Assembly
New Head
New lifters, push-rods, etc.
I'm 100% certain the timing chain needs a reboot (I'm at 285K+ at the moment) and the shop agrees it's piston slap, so I'm looking for a rebuild.
Actually I came here today to see if anyone had good recommends on a rebuild kit?
As the engine mounts need replacing, I'm actually wondering if I should just swap the engine altogether or do the rebuild myself.
Either way, I'm currently leaning toward the CompCam kit for chain, crankshaft and such. Sucks that I already did lifters and whatnot, but I'm more concerned with getting good quality pistons and rings.
Any ideas from the community?
Hey folks. Sorry I haven't updated in a while, just haven't had anything to update. Until now. The knocking sound was still as present as ever, so I decided I'd try a different approach. I don't normally care for additives, and I know there are a ton of different opinions on here about them, but I've tried so many different things that I thought, what the heck? I will try one out. I bought a can of Engine Restorer a while ago that has just been sitting on my shelf, so I decided I'd give it a try with my previous oil change. I used Rotella T6, 5w-40, and added the Engine Restorer... and was BLOWN AWAY.
The knocking is gone, and the engine is running smoother than ever.
Now, don't get me wrong, I'm not advocating for Engine Restorer, I'm not dumb enough to think that solved the problem, rather it more than likely just cleared up a symptom for a little while. But I am fascinated by the result. I still get a little bit of clanking after I've run the engine for a while, especially after shutting the engine off, and then turning it back on again when it's still warm. Like when running to the store or something. I will notice some clanking on startup at that point, but it's still drastically quieter than it used to be.
So, that says to me that the noise is definitely coming from something in the engine, most likely piston slap. Engine Restorer claims to "fill in the warn spots" in cylinder walls, so I imagine that could be what has helped quiet the sound down, especially if it was indeed the piston banging back and forth.
I know some have expressed concerns about cat failure using this stuff, and other have said it's liquid gold. I don't have an opinion either way yet, I'm just here to share an update, that's all.
At the moment, I'm enjoying the quieter and smoother ride, with noticeably increased power. I'm not a fan of just treating symptoms, I'd rather treat the cure, but I only drive my TJ a few thousand miles a year, so for me, the benefits may outweigh the risks. Time will tell.
Thanks for all your great input! This is such a great community!
The knocking is gone, and the engine is running smoother than ever.
Now, don't get me wrong, I'm not advocating for Engine Restorer, I'm not dumb enough to think that solved the problem, rather it more than likely just cleared up a symptom for a little while. But I am fascinated by the result. I still get a little bit of clanking after I've run the engine for a while, especially after shutting the engine off, and then turning it back on again when it's still warm. Like when running to the store or something. I will notice some clanking on startup at that point, but it's still drastically quieter than it used to be.
So, that says to me that the noise is definitely coming from something in the engine, most likely piston slap. Engine Restorer claims to "fill in the warn spots" in cylinder walls, so I imagine that could be what has helped quiet the sound down, especially if it was indeed the piston banging back and forth.
I know some have expressed concerns about cat failure using this stuff, and other have said it's liquid gold. I don't have an opinion either way yet, I'm just here to share an update, that's all.
At the moment, I'm enjoying the quieter and smoother ride, with noticeably increased power. I'm not a fan of just treating symptoms, I'd rather treat the cure, but I only drive my TJ a few thousand miles a year, so for me, the benefits may outweigh the risks. Time will tell.
Thanks for all your great input! This is such a great community!
Hard to believe it's been four years since I replaced my pistons and over 7,000 miles ago. Jeep runs great and is quiet. Well, the engine knock is gone but there's plenty of other noises. I've done countless repairs to this thing over the last four years 
.
Just an update video:
Also, glad to hear you made some progress, The Goblin! Keep us updated to date on how it works out long term.
.Just an update video:
Also, glad to hear you made some progress, The Goblin! Keep us updated to date on how it works out long term.
Hey folks. Sorry I haven't updated in a while, just haven't had anything to update. Until now. The knocking sound was still as present as ever, so I decided I'd try a different approach. I don't normally care for additives, and I know there are a ton of different opinions on here about them, but I've tried so many different things that I thought, what the heck? I will try one out. I bought a can of Engine Restorer a while ago that has just been sitting on my shelf, so I decided I'd give it a try with my previous oil change. I used Rotella T6, 5w-40, and added the Engine Restorer... and was BLOWN AWAY.
The knocking is gone, and the engine is running smoother than ever.
Now, don't get me wrong, I'm not advocating for Engine Restorer, I'm not dumb enough to think that solved the problem, rather it more than likely just cleared up a symptom for a little while. But I am fascinated by the result. I still get a little bit of clanking after I've run the engine for a while, especially after shutting the engine off, and then turning it back on again when it's still warm. Like when running to the store or something. I will notice some clanking on startup at that point, but it's still drastically quieter than it used to be.
So, that says to me that the noise is definitely coming from something in the engine, most likely piston slap. Engine Restorer claims to "fill in the warn spots" in cylinder walls, so I imagine that could be what has helped quiet the sound down, especially if it was indeed the piston banging back and forth.
I know some have expressed concerns about cat failure using this stuff, and other have said it's liquid gold. I don't have an opinion either way yet, I'm just here to share an update, that's all.
At the moment, I'm enjoying the quieter and smoother ride, with noticeably increased power. I'm not a fan of just treating symptoms, I'd rather treat the cure, but I only drive my TJ a few thousand miles a year, so for me, the benefits may outweigh the risks. Time will tell.
Thanks for all your great input! This is such a great community!
I have the exact same story. Engine Restorer took the slap away...for about 1000 miles. No other side effects though. I just let it slap for another 3k and added it again. Gone again for probably 1000 miles. It's kind of shocking that it works even at all
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