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  #1  
Old 05-09-2010, 03:40 PM
Chris Chris is offline
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Join Date: Feb 2010
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Default tapping sound under the hood?

I recently begin to hear a knocking sound at idle when the truck is started, under the hood. It goes away after driving, and it doesn't always knock, it doesn't seem to matter if its cold or warm. Sounds like a lifter on the passenger side, but you can hear it with the windows rolled up.

Any ideas?
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  #2  
Old 05-09-2010, 05:53 PM
mb128 mb128 is offline
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Default Re: tapping sound under the hood?

check ur oil. or its the lifters knocking. im not 100% sure though so dont quote me
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  #3  
Old 05-09-2010, 11:31 PM
Chris Chris is offline
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Default Re: tapping sound under the hood?

Oil is fine, in fact just did a change thinking it would rid of the sound. If its the lifters, I haven't noted any performance loss, and as I said it isn't always there, sometimes when I start the truck after its sit for a minute or so, I'll hear it, other times I can start it up, and its fine. My truck isn't even missing, or nothing that I can tell. I had a Taurus 3.0L that had a headgasket gone, and it'd cause the lifters to knock really bad, and it would cause my car to miss fire, this thing doesn't even seem like its all the lifters, but maybe one. Can they be adjusted or what?
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  #4  
Old 05-10-2010, 04:30 AM
sgtsandman sgtsandman is offline
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Default Re: tapping sound under the hood?

I have the same thing on 2.5L until it warms up. From previous experience, the brand of oil can make a difference believe it or not. One brand is more prone to it than others depending on what your engine likes. You may have to experiment a little to see which ones will work best for your engine. It's kinda like a firearm, each one has it's "preference" on what it will shoot best with.
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  #5  
Old 05-10-2010, 05:32 PM
CivicKiller-16 CivicKiller-16 is offline
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Default Re: tapping sound under the hood?

is it ohc. if it is the the valves might need adjustment
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  #6  
Old 05-10-2010, 05:44 PM
bcghosttowns bcghosttowns is offline
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Default Re: tapping sound under the hood?

Is your oil pressure up?
Check for an exhaust leak at the manifold.
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  #7  
Old 05-10-2010, 06:05 PM
DieHard4rd DieHard4rd is offline
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Default Re: tapping sound under the hood?

Dude its the hamster wheel. The bearnings are about shot.. Time for a new hamster wheel



Sorry, I couldnt resist!
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  #8  
Old 05-10-2010, 06:15 PM
Chris Chris is offline
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Default Re: tapping sound under the hood?

Quote:
Originally Posted by bcghosttowns View Post
Is your oil pressure up?
Check for an exhaust leak at the manifold.
Seems to be fine. I just changed the oil, been using Mobile 1 Synthetic Truck and SUV since I got the truck. Doesn't seem to be an exhaust leak that I can tell..

Its a SOHC, 2004 Ford Ranger.
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  #9  
Old 03-03-2011, 10:34 AM
TexasRanger04 TexasRanger04 is offline
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Default Re: tapping sound under the hood?

I have the same problem, im trying to find out how to fix it.

Dude its the hamster wheel. The bearnings are about shot.. Time for a new hamster wheel

And stupid Question, What is the Hamster Wheel? Oh god im gonna regret this!

I have it at start up but it doesnt seem to be harming the performance until I run for a longtime at 70. When i slow down it feels like im losing spark.
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  #10  
Old 03-11-2011, 10:08 AM
michael taylor michael taylor is offline
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Default Re: tapping sound under the hood?

I have a 4.0 OHV with the same annoying sound. Tried everything, went everywhere, and no one could figure it out. Finally picked up a can of Sea Foam Spray carb-cleaner, and right into the throttle body it goes. Make sure you pass by the butter-fly and keep the rpms up to 3500 to 4000 while spraying.
Worked like a charm. Less than $10.00.
regards,
MT
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  #11  
Old 03-12-2011, 12:43 AM
Prunedale 4x4 Prunedale 4x4 is offline
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Default Re: tapping sound under the hood?

lifters?
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