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Engine Strange Noise

  • Thread starter Thread starter burntokita
  • Start date Start date May 8, 2026
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burntokita

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Apr 22, 2025
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North Carolina
May 8, 2026
#1
  • May 8, 2026
  • #1
I’ve got an 88 Fox, 60k miles MAF converted. Semi-recently did lower intake gaskets, but in general I just let the car be how it is. I’ve noticed recently I get a dull, not necessarily thud but loud enough I can hear it at idle metallic-ish noise that I simply cannot track down. It’s got the regular tick you can hear with very close proximity, but this is not that. I’ve also got a sporadic shake at idle, but I’m fairly certain it’s an unrelated IAC issue as the car won’t die once the IAC has been unplugged. I can’t hear the noise anymore once the car goes above idle. There’s a video attached, I’m apprehensive to call it a rod knock simply because I’ve got no loss of power, am at relatively low miles, and it just doesn’t seem intense enough to be what I’ve observed in other vehicles. I’m not going to act as if I baby the car because I don’t, but I certainly don’t have a history of misshifts or redlining it. Previously it was ran a quart-ish low on oil, from what I’ve been told, but that was over a year ago. Done more than a few oil changes on it since and haven’t seen any glitter.

It’s got typical leaks and creaks but nothing (other than this) out of the ordinary. I’ve not put a gauge on for oil pressure, but the wildly inaccurate one in the cabin hasn’t given me much reason to do so outside the needle jiggling every now and again.
 
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burntokita

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Apr 22, 2025
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May 8, 2026
#2
  • May 8, 2026
  • #2
Video: https://files.catbox.moe/dd00a0.mov
 

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
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Middle of Maine
May 8, 2026
#3
  • May 8, 2026
  • #3
The Nods are rocking.
One at a time, pull a plug wire off of the distributor and see if the noise goes away.
If it does, you have located the cylinder with the problem.
Or, stick a brick on the throttle pedal and walk away. At some point the noise will go away and you can pick up the pieces of the problem cylinder off of your driveway.
 
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burntokita

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Apr 22, 2025
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May 8, 2026
#4
  • May 8, 2026
  • #4
The thing about it is that I first noticed this noise MONTHS ago. I hit 5500 consistently, at least 3 times a week, drive the car daily, have taken it on 5 hour roadtrips, and put nothing but 5-30 in it. I’ll try out what you said but I have a hard time believing any sort of rod failure wouldn’t have killed the cylinder completely by now.
 
Reactions: General karthief
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burntokita

Member
Apr 22, 2025
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North Carolina
May 8, 2026
#5
  • May 8, 2026
  • #5
Bullitt347 said:
The Nods are rocking.
One at a time, pull a plug wire off of the distributor and see if the noise goes away.
If it does, you have located the cylinder with the problem.
Or, stick a brick on the throttle pedal and walk away. At some point the noise will go away and you can pick up the pieces of the problem cylinder off of your driveway.
Click to expand...
Did what you said, pulled the wires off, and after shocking myself twice, we’ve not learned a thing other than that the noise is louder when the car is warm. Still perceivable from dead center on the lower intake manifold despite what cylinder I had off.
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
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May 8, 2026
#6
  • May 8, 2026
  • #6
Take a look at the harmonic balancer, watch it from the side while the engine is idling, if it wiggles or wobbles it needs changing.
And run 10w-30 in it.
JMO
Oh, does it 'rattle' for a sec when you cold start it after sitting for a few days?
 
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burntokita

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Apr 22, 2025
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May 8, 2026
#7
  • May 8, 2026
  • #7
General karthief said:
Take a look at the harmonic balancer, watch it from the side while the engine is idling, if it wiggles or wobbles it needs changing.
And run 10w-30 in it.
JMO
Oh, does it 'rattle' for a sec when you cold start it after sitting for a few days?
Click to expand...
Will switch to 10-30 on the next oil change, I’m moving to TX anyway and it’ll be better for it. Currently live in the Appalachians so the 5-30 makes most of the year much easier. No rattle. Little Harmonic balancer movement, but not anything crazy. Could still be the culprit, but with where the noise emanates I just have a hard time with that answer. Could very well be echoing, I guess. It’s not too hard to get off, maybe I’ll give it a shot. Wanted to check my supposed 12 degree timing with a balancer that had proper visible numbers on it anyway.
 
Reactions: General karthief

AeroCoupe

lube between the nut and the face. I know my lubes
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Oct 28, 2001
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May 9, 2026
#8
  • May 9, 2026
  • #8
Some good info on balancers in here:

Drivetrain Post in thread 'Clutch got coated with dust during plasti-blasting'

Aug 10, 2023
Ummm that mofo is done. So do you want a good stock replacement or a SFI approved (read racing) one? Good thread on them:

doing harmonic balancer for first time

Well. ...... You could but you have to lube the washer to get an accurate torque read how do I know where to stop I have a finger gap of space from the balancer to the seal I'm just being careful I've never put one in before iam 40 but never worked on cars from the 90s
stangnet.com
  • AeroCoupe
 
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keel

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Aug 23, 2020
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May 11, 2026
#9
  • May 11, 2026
  • #9
burntokita said:
Video: https://files.catbox.moe/dd00a0.mov
Click to expand...
My car will sometimes make pretty much the exact same noise when its warm. I stopped worrying about it after it didn't get any worse or any better after years of clutch dumps, hitting rev limiter, and tens of thousands of miles. Never figured out what it was, none of the mods or maintenance I did made a difference.
 
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