light engine tap with video

[4play]

Ok I know Ive posted this before, and mainly got "save for a new engine" but engine runs fine, I ran across another Marauder owner and heard his engine ake the exact same noise as mine, and he told me his has been making that noise for the last 80K and has not gotten worse.

The engine only makes the noise once it has warmed up a bit, the hotter it gets the louder the knock is it sounds like a bottem end knock, it is comming from the drivers side rear bank, ive had my mechanic buddy thats been a mechanic for 20 yeaars he ws listning with a mechanic's stethoscope, all over the engine top bottem tranny and it was defently coming from the drivers rear cylinder, you can hear it though the end of the exhast pipe faintly and in the block. what's strange tho it stops as soon as you rev the engine up a bit, like 1100-1200 sounds like a VcT knock but our car dont have VCT I was told. the knock it just a bit louder then the injectors when listening under the hood, you can hear it the best by the front drivers side wheel or under the car. the oil allways looks good, it's been doing the same for 12,000 miles has not gotten worse and only does it when the engine is Hot. it's quiet when cold. starts after about 15 min after idleing. Most engie knocks get worse when you rev it up with this one it goes away completely, i'm lost lol.

Here's a video a took you can hear it more clearly closer to the end of the video, I know you can hear alot more noise's the microphone on My video cam is just verry senseitive. listen for the distinct knock
View My Video (http://tinypic.com/r/157hro2/5)

[Black_Out]

You sure it's not coming from the one of your cat converters? Sounds like maybe some catalysts are loose, and once you give it some gas and put some flow through the cat they stop rattling around.

It might sound stupid but just make sure it's not that before you go tearing into the engine!

[4play]

no defently not. put the stethoscope on those too, hit them around, made no diffrence in the noise, you can hear it on the manifold port coming out of that cylinder and on the block on that rear cylinder and nowhere else, not even on the rear main bearing, I was thinking maybe it's oil pressure related? still have not done a test on it. sounds like a bottem end knock but acts noting like it LOL i'm lost.. the engine still runs awesome no smoke does not use oil. Help lol

[justbob]

I haven't checked it that indepth, but mine does the exact same thing as yours since I bought it with 13,000 miles, S/C'd at 47, currently at 66,000. Never once changed and only really noticeable when near a wall for the noise to bounce off of. Another members car was at my house today with only 44,000 and it also made the exact same sound as you describe. I quit worring about it many years ago. If it goes it goes. But like I said, never once has it changed in any way.


Your video wouldn't work for me. I'm baseing this off your post.

[FordNut]

Roll up the windows, turn up the radio

[juno]

Have you completely ruled out the head?

[4play]

for sure not the head, it's in the lower block driver's side rear. I know it's not hana blow, i'm not worried about it but it's inda embarresing pulling up somewhere "hey dud your engine knocking" lol what do you expect it's a ford i reply LOL then I leave him in my dust. idk just wondering if anyone heard this before and know's what causes it... i'm leaning to oil pump, thinking I might get the pressure checked.

[LeoVampire]

for sure not the head, it's in the lower block driver's side rear. I know it's not hana blow, i'm not worried about it but it's inda embarresing pulling up somewhere "hey dud your engine knocking" lol what do you expect it's a ford i reply LOL then I leave him in my dust. idk just wondering if anyone heard this before and know's what causes it... i'm leaning to oil pump, thinking I might get the pressure checked.

Did you check to see if you can feal any hot air comming out around the manifold or where the converter bolts up to it?

[4play]

yes I had the car up on the hoist. no leaks. you can hear it clearly from the echast port coming out of that cylinder and right on the block on that cylinder... I know i'm lost and so was the mechanic... it has nothing in common with your typical knock...

i found this and this is basically my problem and the fix.... but I was told our engines are different from the 5.4 and regualr 4.6 and that our 4.6 DOHC does not have a VCT system... but this is what it said

"VARIABLE CAM TIMING

The 4.6L 3V and 5.4L 3V variable cam timing (VCT) feature may emit a light knock in normal operation and is audible only at idle speed, with a hot engine (gear selector in parktneutral). However, it may be masked by or mistaken for other noises generated from either injector firing or a malfunctioning valve train as described above. The noise does not affect performance or durability of the part.

VCT phasers may knock at hot idle. it may be heard inside the passenger compartment, or the wheel well area. Some light noise is normal. The engine may require a cold soak overnight for a full diagnosis to effectively be made at hot idle, particularly when a VCT phaser is suspected. The knock is not prevalent at cold temperature.

To test for VCT noise:

1. Place the transmission in park or neutral.

2. Bring engine oil temperature to 160°F (71° C) or above as indicated by the scan tool "EOT" PID.

3. Allow engine to idle, and determine if noise is noticeable.

4. Set engine speed to over 1,200 rpm (if noise is a VCT knock, the noise should disappear).

5. Return engine speed to idle (verily knock returns). If the noise intensity is more than a lightly audible knock at hot idle under 1,200 rpm at engine operating temperature, replace the cam phaser using the camshaft "In-Vehicle Repair" procedure found In the Workshop Manual. If the noise is only a lighly audible knock at hot idle under 1,200 rpm, do not attempt to repair this normal engine noise.'"

That's my EXACT issue.... but i'm lost......and its a little louder than normal.

[LeoVampire]

Most mechanics that are old school can tell the difference between upper and lower engine knocks.

You need to find someone that can track this down for you without costing a ton of money to start with.

Once you know what it is then get an estimate on repair. A good mechanic stethescope with a narrow rod and placing it on differnt parts of the engine to localize where it is comming from.

Compression tests and oil pressure tests might need to be performed as well.

[4play]

yes im working on the oil pressure test. sounds too low to be a upper engine knock tho.... i ust dont know what inside there could make that kinda knock... i mean if it speeds up or gets louder when i give it throttle or makes a knocking noise under a load thats pretty plain and simple... I even pulled the coil on that cylinder and it made no difference in the noise... same with the belt.

[LeoVampire]

yes im working on the oil pressure test. sounds too low to be a upper engine knock tho.... i ust dont know what inside there could make that kinda knock... i mean if it speeds up or gets louder when i give it throttle or makes a knocking noise under a load thats pretty plain and simple... I even pulled the coil on that cylinder and it made no difference in the noise... same with the belt.

It could be a wrist pin knocking rather than a lower bearing. But you have isolated it to a specific cylender from what I am understanding so drop the oil pan and take that piston out and finish confirming the problem.

But it sounds like your in for a rebuild no matter what if I am understanding what you have found.

:(

[4play]

stupid question..... becides removing the oil pan how do I remove the piston?

[LeoVampire]

stupid question..... becides removing the oil pan how do I remove the piston?

Unbolt the piston connecting rod from the crank take off the bearing cap and turn the crank until it is away from the connecting rod and then pull the piston out.

But I would not do just do the one if there is a problem.

Better to yank the motor out and do it right!

[4play]

can i just mail it to you lol

[LeoVampire]

can i just mail it to you lol

If I had the facilities I would do it all of the time for people.

In the past when I lived in Mass a friend had a shop with flow benches and bridgeports and everything else you could imagine for turning and engine into something that would make people cringe!

The good ole day's of making Pro Stock cars and engine's for guy's and ourselves.

Use to have a 1968 Mustang GT that could hold a standing wheely for the first 3 gears. All I would do is change the tire's over to race on the track and then put the street's back on for everyday Driving.

Unfortunatly law's and time has made those type's of car's illegal for the city street's.

[4play]

well, i'll just wit till she blow's then i'll stuff a cumminns diesel in her.... then she'll be good for at least a million miles more..

[JimP]

Video isn't there, can you post it up again pls. I want to have a listen.

[NOMARQUIS]

Yes, repost the vid!

[RacerX]

I thought you had to move the K member to get that there oil pan out... :D

[Zack]

You probably have the famous early 03 Head Tick.

[4play]

nah it's defently not a tick. it sounds like a bottem end Knock. coming from the down in the block drivers side rear. like I said as soon as i rev it up to 1200 or so it's gone. and it dont knock cold.

[JimP]

I heard what sounded like bottom end noise on a 2003 MM today. Was talking to the guy who was getting his car serviced at a friends garage. It's faint but you can def hear it once warm. Real hard to isolate as stated in above posts.

It sounded like it goes away once you rev it but I'm sure it's just the other noises that are drowning it out. Anyhow, he asked that the shop leave it low by about half a quart after changing the oil. The owner then added half a bottle of lucas oil stabilizer and the noise was gone. Says he's been doing this since he bought the car 4 years ago. Not a member on this site so I told him about it, said he'd check it out.

From what I gather there is something which is getting cushioned after adding the oil stabilizer, it looked thick, all I can say is car was quiet afterward.

Think he said he had about 110,000 kilometers on the car, it was nice.