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"lassie" <invalid@invalid.invalid> wrote in message
news:g9smhn$a9o$1@news.albasani.net...
>
> "dwight" <dwight@XtfrogX.com> wrote in message
> news:VsudnUDZGpZMSVzVnZ2dnUVZ_sWdnZ2d@comcast.com. ..
>> "Mike Lenker" <mikestang64@verizon.net> wrote in message
>> news:wQfwk.581$sq3.384@trnddc07...
>>> I agree, check all exhaust components, especially heat shields on the
>>> cats. Most likely due to a harmonic frequency at that RPM. Several
>>> wavelengths from different drivetrain components may come into synch,
>>> thereby amplifying themselves through loose components. If there is
>>> nothing loose on the outside, take a rubber mallet and it each cat (not
>>> too hard) and listen for rattles. I've had baffles break loose inside
>>> and cause rattling noises. If that's the case, get a whole new H-pipe
>>> and do a DIY install. Might be cheaper than a shop cutting out and
>>> replacing one bad cat. If a shop just replaces one, you'll still have 3
>>> old cats which may do the same thing eventually. As a bonus you can get
>>> legal hi-flow cats and gain a few HP.
>>>
>>> mkl
>>> '86 Capri 5.0 5-spd
>>> 175,000 mi
>>
>> Heat shields. That sounds right. And an easy and very cheap fix, too -
>> rip it out.
>>
>> dwight
>
> there was a recall on the cats on 5.0 before 92? (free cats)
> The ceramic would break inside the cat and heat up, cause funny sounds
> etc.
> Had a 89, one side was broke, would resonate about 3k as a loud muffled
> sound, 2.5 to 3.5 or so.
> fixed for free by ford.
> Also a loose fitting on the exhaust pipe somewhere can do it.
>
yup, had my h-pipe replaced under recall many moons ago. Insides still
fine, but shedding heat shields every so often. About ready to drop another
one.
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Re: 5.0 rattle
