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Old 12-03-2011, 04:07 PM
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need some guidance

i have a 99 f250, with 160,xxx that i just bought
here is the problem,
at idle it sounds like a kind of knock, deff. a noticeable noise, than when u reach above 800 rpm it diminshes completely..
i believe this to be an injector, but i would assume it would smoke a bit if it was,

all help would be greatly appreciated thanks, james
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Old 12-03-2011, 06:52 PM
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It could be an injector, but it could also be in the valve train. Had a friend that chased a knock. Nothing could be found, so the tore the whole valve train apart thinking a bent pushrod. Nothing was found, so they put it all back together and the knock went away.
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Old 12-03-2011, 06:59 PM
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Could just be the #8 AD 'long lead' injector that can routinely knock with no problems.
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Old 12-04-2011, 06:19 PM
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Quote:
Originally Posted by jesilvas View Post
Could just be the #8 AD 'long lead' injector that can routinely knock with no problems.
#8 LL is an AE injector, the rest are AD's. His 99 most likely does not have a LL injector in it though.
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Old 12-04-2011, 06:32 PM
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Yea I knew it was different, but couldn't remember what code the rest were.
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Old 12-08-2011, 04:15 PM
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mine has the same problem its an 01 with 186,000 a noticable knock at idle but goes away when accelerated. I was told it was injector. it drives me crazy but it has done it for 30,000 miles now and no smoke yet.
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Old 12-08-2011, 09:14 PM
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stick your ear down to your trans bell housing your problem sounds like mine and I think my torquew converter is going out
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