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1968-2013 Full Size Vans Econolines. E150, E250, E350, E450 and E550

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Old 10-22-2012, 06:07 PM
Cowcharge Cowcharge is offline
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4.9 valve clatter

Hey all, '94 e150 with a 4.9l 6, 190k. Doesn't use any oil and mostly runs ok. The valves don't make any noise at idle, while accelerating or decelerating. But when going down a hill (especially at highway speed), and the van "catches up with the engine" so there's no load, there's a godawful clattering until I either let off a bit or give it enough gas to put a load on the engine again. Any idea what would cause that? Thanks!
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Old 10-22-2012, 10:32 PM
joshofalltrades joshofalltrades is offline
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sounds like it may need new lifters. or you could try a can of seafoam or whatever to hope it'll loosen up your existing lifters - but new would be best. they're not too bad to install.
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Old 10-23-2012, 02:00 AM
pacific350 pacific350 is offline
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Normally I'd think weak springs from too much heat like some days of a bad radiator or bad gas which all ethanol is in my book or too low of an octane.

It's not me doing the job so I won't suggest looking under the vavle covers to see whats up
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Old 10-23-2012, 02:04 AM
joshofalltrades joshofalltrades is offline
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if he looks into changing the lifters, he'll have the valve cover off in the process, and at least take a look around. i've put 300s through hell and never had a valve spring problem, nor have i heard of it being a common problem with 300s. but i have had lifter problems on them
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Old 10-23-2012, 02:04 AM
 
 
 
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