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I made a short video comparing my engine to every video I could find where someone was having similar symptoms, most of which said it was a timing chain issue. I think I can hear a similarity in the rate at which the knocking occurs, but maybe I'm just telling myself that because i want a...

When I hold the hose to the top of the valve covers at the front I can hear a slight clicking noise, it doesn’t seem like the source of the loud knocking though. I poked the hose everywhere and found that it was very loud when placed on every single one of the injectors. I searched the forum...

Here’s a video of my engine running. The knocking noise is pretty loud and there also seems to be a hissing noise. I held a hose to my ear and could hear a loud hissing noise when the other end was on/around the EGR valve.

Thank you! I looked into this and it seems very likely. A post in another thread said that the gasket is above the drivers side coil bank. This makes sense because my cyl 8 coil was very rusty, cyl 7 -kind of rusty, cyl 6 -a little rusty. Should I take the valve cover off and take a look/clean...

I’ve been researching possible issues all night and I am wondering if it could be my timing chain tensioners (FFS everything I read seems like it could be the problem). My car does have a loud clacking noise coming from the engine that should not be there. My car has ~185k miles and I’m sure...

Also, I put a towel over the air intake tube where it connects to the filter box and wedged a lit cigar between the towel and into the intake hole (where it disconnects right after the MAF). Let my car smoke the stogie for a good 10 minutes while I looked everywhere for smoke - didn’t see or...

And now for an update. Car was running amazing after I replaced everything I mentioned in my previous post. Best gas mileage I’ve ever gotten, ~28hwy/~17city. That lasted about 3 days. Car started idling rough again and stalling out at stop lights and during slow turns coming from a stop. It’s...

Here are the pictures I was supposed to post of the adapter thing. I put a ring of jbweld marine putty around the lip and smushed it down into its hole.

You were right thanks Joe.

Thank you all for your replies. I think I figured it out! The hose I said I already replaced (post #7), well the sound was coming from on the passenger side where the hose goes into the top of the intake manifold (Bottom picture, blue arrow). Apparently there is a plastic adapter that goes...

Car dies while idling in park Found it. I already replaced that hose yesterday though. Think I’ll order a new one of these:

Thank you, I’ll pick some up and see what I can come up with. Another thing, on my lunch break today I let my car idle until it started running rough. Turned off my car and unplugged the MAF sensor and started it back up, idled fine for ~10 minutes. Turned the car off and plugged MAF back in...

New one ordered and will be here on Thursday.

And here is a picture of the plastic tube that I broke off (used some epoxy to put it back on for now). Found this picture on the internet but the arrow is pointing at the piece that broke off in the hose.

Also, I recently cleaned the MAF and I have not checked O2 sensors. I only replaced 3 vacuum hoses and the "new" ones came from the junk yard but they looked fine and fit much tighter. I inspected the larger diameter hoses and wrapped them entirely with electrical tape just in case, they feel...

Is this where you’re taking about?

Where exactly are these gaskets you’re talking about? I think I have a vacuum leak and this sounds like a place I haven’t checked.. want to check everything I can before I take a look at the intake manifold gaskets (the ones you mean when you said “the metal ones between the intake and the...

Hello all! For years now I have used this forum to help me diagnose and solve my LS issues -and am sincerely thankful you guys have put so much information out there- but the time has come for me to finally make an account and ask for some input. Right now my 2002 3.9L Lincoln LS (180k mules)...