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  #1  
Old 03-12-2011, 07:38 PM
kale kale is offline
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Default Loud knocking/tapping sound from driver's side.

I have a loud sound coming from the drivers side of the engine that changes as the engine speed does.

My truck is a 95 ranger with a 3.0L Vulcan with over 250K.

I have removed the intake, and the drivers side head, hoping to find some obvious problem but everything looks fine. The head gasket seemed fine from inspection and the valves are all sealed relatively well. I have visually inspected the lifters, but they all seems fine. Is there something specific I should do to test them out?

The sound I hear is identical to the sound in this video:

So since I seem to see no problems with the pistons, cylinder head, valves or pushrods, what are other options that could making that knocking sound?

Also, I had low compression all along the that side before I took it apart. I think it was 60, 30, 90psi front to back. Also when I took the spark plugs out, the front driver's side was all burned up, but the other too were in great shape.

I'm really lost on what the next steps I should take are. Thank you for any advice you may have!
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Old 03-12-2011, 08:00 PM
klinger86 klinger86 is offline
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Default Re: Loud knocking/tapping sound from driver's side.

Sound to me like the fuel injectors firing. I know sometimes they are knida loud like in the video. Does it speed up under acceleration and slow down at idle?
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Old 03-12-2011, 08:19 PM
kale kale is offline
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Default Re: Loud knocking/tapping sound from driver's side.

Further into the video he revs the engine, that may help. It's just so loud I find it hard to think that it is a fuel injector. Also the sound seemed be be coming more from down on the block/ exhaust side of the head than from the intake area.
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Old 03-12-2011, 08:23 PM
mickblock mickblock is offline
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Default Re: Loud knocking/tapping sound from driver's side.

listen for the lower pitched, less frequent sound Marty.
To the op, read up on pre-detonation and engine knock. That'd be my guess.
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Old 03-12-2011, 08:38 PM
kale kale is offline
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Default Re: Loud knocking/tapping sound from driver's side.

I can't believe I didn't think of either of those. They do seem to fit with no physical damage inside the compression chamber. Although one of the cylinders( the 30psi one) has quite a bit more carbon buildup than the other two.
Would any of that explain poor compression though?
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Old 03-12-2011, 08:58 PM
mickblock mickblock is offline
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Default Re: Loud knocking/tapping sound from driver's side.

Cracked compression rings(s) from prolonged pre detonation could explain the low compression. If the valve seats had the carbon build up and were exclusively allowing that much pressure loss, I'd imagine the engine would run pretty poorly, but it's possible.
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Old 03-12-2011, 09:02 PM
kale kale is offline
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Default Re: Loud knocking/tapping sound from driver's side.

Ok, so if it is pre-detonation then how come it seems to only have affected one side? If it's a timing, mixture or spark issue wouldn't it affect both equally? The compression on the other side of the engine is all in the 120-130psi range.
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Old 03-12-2011, 09:30 PM
DHEM DHEM is offline
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Default Re: Loud knocking/tapping sound from driver's side.

well that dude in the vid said he had a broken valve with chunks missing from the piston.
is it a loud knock?
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Old 03-13-2011, 04:23 PM
kale kale is offline
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Default Re: Loud knocking/tapping sound from driver's side.

Yeah, the knock is loud. But it definitely sounds like something banging into something else, not so much a tapping or knock from bad timing.
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Old 03-13-2011, 04:35 PM
DHEM DHEM is offline
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Default Re: Loud knocking/tapping sound from driver's side.

does it go away as you rev it up?

----------

and did it sound like it was from the upper or lower part of the engine?
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Old 03-14-2011, 09:13 AM
kale kale is offline
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Default Re: Loud knocking/tapping sound from driver's side.

Nope, it's still their faintly at almost all times. In the video it goes away a bit when the revs are dropping, it does that on mine too. But driving at speed I can still hear it.
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