Did I break something??

[Jason94sport]

I was on a HW doing about 80mph. I was between 2 trucks. I had to exit, so I downshifted to 4th & slammed the gas. The truck on the right of me didn't want to let me in front of him, so I stayed in 4th, & the speedo needle was way past the 85mph mark. I wasn't looking at the tach, & was redlining it in 4th all of a sudden I heard a loud knock, I was exiting & slowing down when I relized this. Now when I accelerate I hear this loud clicking noise. Sounds like when you put a card in a bike tire, like a flapping type sound. It happends in all gears, N, & R, at any RPM over 1K. I looked in the engine comparment, & I don't see any leakage, or broken parts. I hear it from the engine when I try to locate it. I don't think it's U-joints, or any suspension stuff since it happends in N, with me just hitting the gas. Any ideas?
Thanks

 

[TSTONE]

couple questions?

1) do you only hear it when rolling, or can you hear it at a stand still?

2) do you still have the original autohubs?

 

[moto_head90]

Maybe something's hitting your fan....

 

[Jason94sport]

I can be stopped in N, or 1st gear, step on the gas, & hear it. Nothing is hitting the fan either. Yes I still have the hubs, But the sound is coming from the engine, not the wheels. The hubs do engage, & disengage fine. My 4X4 works also.

 

[mike dilbone]

sounds like a rod knock from here.

 

[TSTONE]

the card in the spoke sound, sounds like my hubs right before they try to phantom engage(zzzzzzzzzz - bang)(but you have to be moving), but if you are hearing this when in neutral at a stand still and reving the engine it might be a sticky lifter, i have had a clicky sound at idle in my engine since it was new, but it goes away when you rev it

 

[nosaj122081]

Originally posted by mike dilbone
sounds like a rod knock from here.

Yeah, or any number of valve/valvetrain/rocker arms/pushrod/lifter problems.

Redlining it coulda broken a rocker, bent a pushrod, you could have a collapsed lifter, the valve could be beat to death.... Any of those things would make a cycling "tick tick tick" noise.

 

[Jason_25]

Well I can tell you is change the oil, and look for debris in it. If there isn't, maybe something is just a little off and the oil change will fix it, if not, well then you're screwed.......

 

[nosaj122081]

Forgot to mention a little past experience on this, my Mach 1 would start bending pushrods like pretzels above 6000RPM (need some hardened pushrods and guideplates), so it could be something like that and the rattle is the bent pushrod loosing and recontacting the rocker.

 

[Jason94sport]

That's what I'm afriad of, some internal problem with the engine. It still drives fine. Has lots of pickup, & idles fine. The engine only has 62K miles. I'll try the oil change on saturday.

 

[Jason_25]

Yeah it's a shame isn't it. I ruined my engine over the summer by submarining it. When the mechanic popped it open he said it burned NO oil and appeared to be in "like new" condition, and it only had like 80k miles.

 

[nosaj122081]

Good luck, honestly, all the things that I listed (with the exception of a bent or cracked valve or something) I consider to be easy jobs... Pushrods, rockers, lifters, can all be accessed/replace by popping off the intake and valve covers, and they're all fairly cheap, straight forward parts to replace that only need a torque wrench and a set of feeler gauges to work on. I've had some pretty severe valve train problems though, hell, the first 351C I had in my car dropped a friggin' valve and destroyed the piston, block, and heads; needless to say I wasn't happy. Good luck, it could be something as simple as a lifter not pumping all the way up (my Mach did this for a while b/f I replaced them) and the oil change will do the trick.

 

[Isaac]

first of all,,

does it seem to lose or change oil pressure after it warms up,, differently then it did before?
if thats the case it would lean me more towards what im already thinking, in which it sounding like a rod bearing,, all the symtoms you stated are leading to that,, you would still have plenty of power and all,, but sounds like it is a rod bearing.
wouldnt be a bad idea on another note to pull the valve covers,, make sure nothing is bent , broken or just loose.
but like i said , sounds liek a rod to me.

 

[Jason94sport]

FIXED!!! Boy was it simple! Noise turned out to be an exhaust leak. Some little hose that carries some of the exhaust gas to a sensor or something. I don't know what it is called. It's a piece mounted on the drivers side of the intake, has 2 little hoses coming out of it. Anyway, one of the hoses broke, & that's what was causing the noise. I spend $12 & replaced the hose, & the other one next to it. Problem solved. Thanks for the help!

 

[Jason_25]

Wow, I'm glad to hear that. A testiment to the 4.0 toughness. BTW, that was your EGR valve.