Massive Engine Knock on All Startups

[96gt4.6]

I would guess that would be possible. With the change in coil type in '11 the manufacturer said do not unplug while running (coil). Never seen anything on the injector. The only issue I could see happening is on some ecu's once it sees a circuit fault it will disable that injector for that key cycle, which can make cylinder balance/contribution testing a pain as you have to key cycle after each reconnect.

Although I have never personally verified this on a coyote ecu so no proof there.

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[racingmason]

Quick update. The oil analysis came back and everything looked normal. They said it can be ran 8k on the oil based on the sample. Iron was 42 ppm and copper was 10ppm but they said it tested like a coyote with 5800 miles on it.

Inuavent drive the car much. Instated it up every few days and surprisingly it went at until today when it came back faintly on a cold start.

 

[96gt4.6]

On one hand this is great news really. With the analysis results coming back clean like that, and the fact the noise seems to be intermittent in nature, combined with no evidence via boroscope inspection, really starts to shy away from major concern.

The cylinder cancel test will help shed some more light on the issue as long as it is done properly.

Those videos sure pull out the noise....it sounds really loud!

 

[Tommy V]

Yea were are all the experts now that were telling this guy to.pull the motor and put a shortblock stating other members must not have any experience lol.Bet u would have pissed off if u pulled that motor out listening to them knuckleheads!!!. Zaza Anyway glad your motor is good op,im sure you find the culprit of your noise.

 

[engineermike]

Remember det_riot that had a knocking engine, took it apart, and couldn’t find anything wrong inside?

 

[Tommy V]

Yes i seen that thread,my point was nobody can diagnose an engine noise listening to it over a phone or computer.Doing this for 30 years pulling the motor is the last u do after u check all other things.Hell i have heard flywheels,ehaust,transmissions make sounds,that u would swear are rod knocks.I put headers in mine 6 months ago at only at idle while in drive i swore i had a rod knock!!Turned out that it was not even the header gasket,it was the mid pipe that connected to the collector and clamp was not tight enough.Sounded just like a knock.Not saying this is his case but i would check everything i could before pulljng a motor out.

 

[engineermike]

I had a 2000 Lightning with a tap. I would have bet money it was a bad hydraulic valve adjuster but it turned out to be a loose spark plug. Figured it out when the plug was ejected under load...

 

[Tommy V]

Lol yea i know a few ford buddies back in the day that had that happen.Bad thing for them though was the threads come out too!!

 

[Jay-rod427]

As some have alluded on this thread, its time to pull the motor out and perform diagnostic tear down. Its interesting to read advice on this thread and realize only half the folks on this board actually know what they are talking about. Once you've determined its the motor itself...DONT RUN IT ANY MORE. Its time to pull it and tear it downl

Blown

Lol right? Video totally sounds like muffler bearings, kaframp stand and benzene ring all hitting each other on cold start. Maybe bad washer fluid?
Thought we were all too gumby to hang on yellowbullet and thats why we are on 6G instead.
At least peeps are trying even if just morale support.
.. could be canooter valve or a bent dinglehopper making that noise too.

Yea were are all the experts now that were telling this guy to.pull the motor and put a shortblock stating other members must not have any experience lol.Bet u would have pissed off if u pulled that motor out listening to them knuckleheads!!!. Zaza Anyway glad your motor is good op,im sure you find the culprit of your noise.

Wait what Tommy?! LOL.

OP oil report is good news, but not entirely out of the woods yet. MUST do diagnostics until you find the actual source. Don't pull anything, or replace anything until you're sure it's the problem. Hopefully you find it soon, and can tell all us keyboard warriors which crowd is right.

I know you've messed around with gaskets, and bolts, but have you taken the driver header completely out of the car? If nothing else with it out of the way can look around for other sources.

 

[racingmason]

Wait what Tommy?! LOL.

OP oil report is good news, but not entirely out of the woods yet. MUST do diagnostics until you find the actual source. Don't pull anything, or replace anything until you're sure it's the problem. Hopefully you find it soon, and can tell all us keyboard warriors which crowd is right.

I know you've messed around with gaskets, and bolts, but have you taken the driver header completely out of the car? If nothing else with it out of the way can look around for other sources.

It was not pulled out of the car all the way. I checked motor mounts while I was in there and ensured there was a gap between the headers and steering shaft. The sound is intermittent now. Sometimes it's there and sometimes it's not. Exhaust is lined up and tight. I havent checked the clutch yet. It's on its last day as hard pulls it now slips in 5th gear on 93 octane. I'm surprised the factory clutch made it that far tbh.

 

[Jay-rod427]

It was not pulled out of the car all the way. I checked motor mounts while I was in there and ensured there was a gap between the headers and steering shaft. The sound is intermittent now. Sometimes it's there and sometimes it's not. Exhaust is lined up and tight. I havent checked the clutch yet. It's on its last day as hard pulls it now slips in 5th gear on 93 octane. I'm surprised the factory clutch made it that far tbh.

Could be clutch/throw out bearing coming apart making noises. I mean check the actual header for cracks. Not tight joints.

 

[Tommy V]

If clutch is that bad i would look into the throw out bearing,as some stated in hear if it is that when u push clutch in the noise changes or goes away but NOT always.

 

[racingmason]

If clutch is that bad i would look into the throw out bearing,as some stated in hear if it is that when u push clutch in the noise changes or goes away but NOT always.

Noise doesnt change when clutch is depressed or engaged. It's nice out today and I double checked every bolt on the headers back to the mufflers. Of there was a leak anywhere in the exhaust it would be easy to see as soot builds up quite a bit over time and you can normally see where its sneaking out. I also used the smoke machine again and plugged up the exhaust and disconnected it at the 3inch collector ball and I saw no leaks, just the smoke coming out the air filter. I also checked starter bolts, motor mounts, front suspension and anything I have removed over the last 18 months and everything was torqued to spec. I took it out for a drive and the noise was back again. Datalogs show no signs of knock or any false knock.

Once I figure out what clutch I'm going with I'll pull the trans and replace the clutch, flywheel, pilot bearing, throw out bearing, and clutch line. It's not my daily driver so I have the freedom to mess around with it at my leisure.

Will keep all updated.

 

[Blown86GT]

Good luck... not scared here to verify it ISNT a problem in the motor to pull it out and verify.

 

[greengoblin31]

how come nobody suggested that it could be a lifter?

before i swapped an engine i would remove the front and top covers and check for any issues with valvetrain.

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