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1995 ford f-150 knocks a higher rpm
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Posted: 01/13/09
11:02 AM
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I am looking at a 1995 ford F-150 4x4 with a 351 in it for $700 but the only thing is that the owner told me it needed motor work. I asked him what was wrong with it and he told me that it knocks at a higher RPM but as soon a it shifts and the rpm's go down the knocking stops. just wondering what the could cause the knocking. also is it worth it to buy something like this a fix t or possibly put a new motor in it.
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Posted: 01/13/09
11:02 AM
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1995 ford f-150 351 knocks at higher rpm's
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Posted: 01/13/09
11:34 AM
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For $700 if the rest of the truck is good I'd buy it.
It's totally possible that knock is just from carbon buildup. Run a can of Sea Foam through it and give it a tune up (new plugs, filter, ect) and see if that cures it. My guess is it will.
Could be wrong though...
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Posted: 01/13/09
11:42 AM
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hey if the truck is'nt beat it's worth 700.00 drop a new motor in it . could be couple things a rod bearing?a lifter depends were knock is coming from? hows the oil pressure? check motor vaccum at intake should run at least 15lbs at idle if has bunch miles buy a long block i just sold a 91 250 extra cab with 351 it had minor mechanical issues i bought for 600.00 and put 1000.00 in it sold for 3500.00 it was'nt a beat truck just sat for a while i did'nt even have truck 2 hours and was getting offers
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SnoMan
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| Posts: 5783
| Joined: 05/04
Posted: 01/13/09
04:31 PM
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My nickle is on a bad rod bearing....
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Posted: 01/13/09
04:34 PM
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Yea, but wouldn't a rod bearing make noise all through the RPM range?
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Long Travel 4 Wheel Drive - The Best of Both Worlds!
Questions? Comments? Concerns? PM Me!
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SnoMan
Addict
| Posts: 5783
| Joined: 05/04
Posted: 01/13/09
05:57 PM
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 FourWheeler Web Editor:
Yea, but wouldn't a rod bearing make noise all through the RPM range?
Not always. If it is not too bad it might float a bit at lower RPM but as RPM's increase and dynamic forces increase on rod the film may rupture and increase clearance and knock loader. Also if it is a rod you will feel it in block with a hand on it. (you can feel it before you can hear it usually) Plugging plug spark on bad rod will cause a change in noise too.
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