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Old 12-17-2009, 03:54 PM   #1
2000Ranger3.slo
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Question Bottom end "knock", what could be the issue?

Alright, so this is not a new issue with my truck just something i figured i would ask about on here. My Ranger has bout 133k miles, still running strong, I love my little truck! But, ever since I can remember there has been this annoying knocking sound or kind of like marbles in my engine(ive heard that expression before thought id use it). When i first crank it its not very noticeable, once it warms up and is idling it is very noticeable. If i rev the engine up you can still hear it if you know what youre listening for but its alot louder when your next to it just lettin it idle. Any ideas would be awesome.
ONe other thing, my truck seems like it is slightly misfiring. I dont have any codes or nothing it just idles very rough, any ideas what could be causing that i thank ya!
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Old 12-17-2009, 04:24 PM   #2
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I'm thinking you should better define the noise. A KNOCK usually sounds somewhat like a person KNOCKING on a door. A click sounds like marbles, cue balls hitting or snapping of fingers.
Knocking is usually a heavy sound form the crank or rod. WHile clicking is usually a top end sound.
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Old 12-17-2009, 08:18 PM   #3
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i agree, the type of sound you have would be very helpful. knocking rods sound very different from lifters.

sometimes a cracked piston skirt can mimic a rod nocking.

exhaust leaks can take the sound of a lifter clicking.

the frequency of the knock relative to engine speed, say half speed or at speed can also be helpful.




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Old 12-18-2009, 07:30 AM   #4
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Hmm. A loud clicking sounds like a good description of the noise i'm hearing. My truck idles at about 600-700 rpm, thats when the noise is most noticeable. When i rev up my truck say 2000-2500 rpm the engine and fan noise drown out the clicking sound so you dont hear it is bad but its still there a little. Its the loudest or most noticeable just idling. I have listened under the hood and the noise seems to be coming from the underside somewhere from the crank back to the oil pan, i just cant localize it. When i rev the engine the clicking increases in speed but does not get louder, when it is idling the speed of the clicking slows down but the noise is louder and/or more noticable. I dont get it, but like i said it has not got worse over the 2 or 3 years ive been drivin it, its just there and if i can make it stop that would be awesome.

What should my truck idle at, is 600-700 normal? And what kind of spark plugs do you guys suggest, maybe thats why my truck kind of rocks when it idles? Liek the timing is wrong or theres a misfire, i dont know any suggestions appreciated..
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Old 12-18-2009, 09:49 AM   #5
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Quote:
Originally Posted by 2000Ranger3.slo View Post
Hmm. A loud clicking sounds like a good description of the noise i'm hearing. My truck idles at about 600-700 rpm, thats when the noise is most noticeable. When i rev up my truck say 2000-2500 rpm the engine and fan noise drown out the clicking sound so you dont hear it is bad but its still there a little. Its the loudest or most noticeable just idling. I have listened under the hood and the noise seems to be coming from the underside somewhere from the crank back to the oil pan, i just cant localize it. When i rev the engine the clicking increases in speed but does not get louder, when it is idling the speed of the clicking slows down but the noise is louder and/or more noticable. I dont get it, but like i said it has not got worse over the 2 or 3 years ive been drivin it, its just there and if i can make it stop that would be awesome.

What should my truck idle at, is 600-700 normal? And what kind of spark plugs do you guys suggest, maybe thats why my truck kind of rocks when it idles? Liek the timing is wrong or theres a misfire, i dont know any suggestions appreciated..
Sounds like a top end noise! A rocker arm or lifter makes the click sound you describe. To find the location of the noise take a long screwdriver of a piece of wood dowel and place one end tightly against your ear and the other end on the engine while it is idleing.. By moving the end on the engine around you will be able to find the nearest place on the engine to the origin of the noise..

Yep! 6 or 700 is normal. No spark plug is EVER better than the one the factory put in there in the first place. Always find the factory plug when changing worn out plugs. Even if you must go back to Ford to get them. All other brand plugs are simply trying to do the same thing the factory ones do. As long as your factory plugs are working they are as good as new..
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Old 12-18-2009, 12:50 PM   #6
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I replaced the plugs n wires around 100k- i probably bought cheap parts then cuz of money situation. I think i should just buy some new OEM plugs n wires. Back to this noise though, it has been making this noise for atleast 2years...it hasnt got worse and doesnt seem to affect the performance. But i'll try listening a little closer and get back to ya.

What do you think might be casuing such a rough idle. Would my cam synchro cause any of my problems, bad coil pack or just crappy plugs and wires?
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Old 12-18-2009, 01:26 PM   #7
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I'll check it and clean it if its dirty... What kind of issues does the cam synchronizer cause if its going bad? Hmm, i dont know. Anyone else who may have some suggestions of things to check either for the clicking noise i have described or why my truck idles so dang rough, it would greatly appreciated. Thanks everyone for the help!
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Old 12-18-2009, 02:49 PM   #8
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Yea, i think i actually put some junk autolite plugs in it...shame on me!! So if the CPS is not squeking or making noise i dont need to worry with it? I wish i could localize or verify what exaclty that clicking noise is coming from, it hasnt got any worse and now i think about about it its been probably closer to 3 years its been makin that noise...uggh, its just annoying. thanks for the ideas
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Old 12-18-2009, 05:29 PM   #9
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My truck does the same stupid thing, I cannot find it and it pisses me off. Mine has 104k on it and ticks from the bottom end. I have used a stethoscope on every part of the motor and have not been able to narrow it down. Just like your truck it doesn't seem to get worse nor does it hurt performance. My only theory is that one of the injectors is noisy enough to reverborate through the motor. My tick seems to be the same speed as the injectors when I rev it up. If you do happen to figure it out please let me know so I can figure this out. I can't hear it from under the hood only from the side of the truck.

Also the cps is not the part that starts squeeking it is the shaft itself. At the mileage you have on the truck I would replace the thing soon because it can also fail with no warning at all and grenade your motor. Not trying to freak you out but it is the reality of these motor. I have done just about every kind of maintanence on mine and the only thing I can't find is the noise.

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Old 12-19-2009, 07:22 PM   #10
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I notice yours is the same year and engine as mine. I have the same sound coming from my engine almost exactly the way you described it. Was like that when I bought it. Its been looked at by several mechanics, had the tranny pulled, changed torque converter, pulled oil pan inspected bolts for main bearings and such. No one can figure out where the sound is coming from because it seems to resonate through the engine. I bought this truck with 72,000 miles on it. It now had 194,000 miles runs fine and still makes the same noise. At a hot idle, oil pressure is 20psi. I just forgot about it and drove it.
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