Sure it is not a loud fuel injector? Heard of several of these engines
having loud injectors.
"Al Figols" <albatross32672@yahoo.com> wrote in message
news:20040628151535.88436.qmail@web40807.mail.yahoo.com...
>
> I have a '00 QC 4.7L automatic which now has 70K
> highway miles on it. I'm used to the various knocking
> and tapping noises that have been part of life with
> this truck since it was new, BUT I now have a new
> noise to question! Everytime I start it up cold(first
> time of the day or after it's been sitting for a few
> hours)it taps for a solid minute or so. It sounds
> exactly like a hydraulic lifter on a push rod engine
> that has bled down. Like a push rod engine hydraulic
> lifter, the tapping goes away after a
> minute or so(after oil pressure builds?). Is this a
> common problem? Could it be that one of the tappets is
> bleeding down? Does the 4.7L engine even have tappets
> that can bleed down? I do have a background in
> mechanics, but I don't have much knowledge of the
> 4.7L. Mainly because I haven't needed to learn about
> it. Any ideas? I hear a lot of horror stories about
> these engines. Thanks in advance!
> Al
>
>
>
>
>
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This archive was generated by hypermail 2b29 : Thu Jul 01 2004 - 00:15:18 EDT