Tapping noise
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Joined: Nov 2002
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Tapping noise
Here's the scoop. '96 f150 4.9 inline 6. Never really had a prob expept for clutch work. (150,000 miles and counting) I wake up yesturday and crank her up and hear tapping or ticking noise. I know its not the tranny since it happens in neutral and seems to get louder when the accelerator is pressed rather fast. When I'm driving and accelerating its loud. When I let it get into a groove of speed it gets quieter. I checked the oil today and it was low. I filled it and it quitened up a little. I checked the plugs and they are fine, no loss of power when accelerating so that should be eliminated. The truck has always tapped a little (very quietly). My thunks are maybe a lifter problem or maybe (God I hope its this simple) a little bad gas. My F-I-L (father in law) thinks maybe a lifter has gone bad too but I'm suspicious since it seemed to happen overnite. Is there any inexpensive and easy way to fix it if a lifter has gone?
Also any suggestions on what else it may be.
I'd hate to have to spend a butt load of money on this truck but I'd also hate to trade it in, I mean I've put all but 8 miles on this truck!!!
Also any suggestions on what else it may be.
I'd hate to have to spend a butt load of money on this truck but I'd also hate to trade it in, I mean I've put all but 8 miles on this truck!!!
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Tapping noise
Just read another post and went and checked my truck. I think its an exhaust leak somewhere near the manifold. Can hear it tapping really good when I rev the engine. I can't find it yet but thats my suspicion. Tapping appears to be coming from there.
Post Fiend
Joined: Nov 2002
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From: Memphis, TN
Tapping noise
If it's an exhaust leak, you'll find it EASILY with a piece of hose to your ear poking the other end around the manifolds/ex pipe. If it's a lifter or other internal mechanical tap, you'll hear it MUCH louder with a long steel bar pressed against the block & sealed to your ear (a long heavy screwdriver works well). If it's internal, try draining about 1/2 qt of oil & replacing it with 1 qt of Marvel Mystery Oil (available at Wal-Mart or most parts stores). If it goes away (even temporarily), it's likely a clogged lifter resulting from infrequent oil changes or other oil contamination. If it gets slightly worse, it may be high wear in general - do a compression test to confirm.
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