Sounds like the dreaded ping.
Doug Fedeli
"A. S." wrote:
> Ok Bernd, got a question. Not sure if this problem is going to do serious
> damage to the truck or not so thought I better figure out what it is. Here
> are the symptoms:
> 1. Metallic rattle increasing to almost a buzz as rpm's rise.
> 2. Only occurs when truck is cold - disappears a few miles down the road or
> when truck reaches normal operating temp.
> 3. Only occurs when truck is cold due to it being cold outside (winter).
> When it's just started in the summer, it will not do it the majority of the
> time.
> 4. It is a loud noise - SEEMS to come from the engine area, but I'm not
> sure.
> 5. Only occurs in 1st and second gear - very rarely heard in 3rd.
> 6. Noise mostly cuts in and out rapidly although sometimes it is continuous.
> 7. Noise usually starts at about 1600 rpm and goes to 2000-2100 (or shift
> point) and again, buzzes more rapidly as rpms climb in gears mentioned
> above.
> 8. Noise stops completly when gears shift but picks back up at close to rpms
> shown above.
> 9. Noise is greatly increased when starting off on a hill when truck is
> cold.
> Now, hopefully I've given enough description that might trigger something in
> your mind that could be the cause. Also note that the timing chain was
> replaced about 30,000 miles ago with whatever it is NAPA sells. I was told
> by the same people that installed it, that my current noise is due to the
> timing chain failing again. Could this be possible? I had it changed
> before due to a rattle at warm idle. That noise is not really there now.
> Also, it seems to me that the timing chain would rattle when the truck is
> warm, not cold. I would think that the heat of the engine would "thin" the
> oil down more than a cold "thick" oil and the heat would tend to add a
> little more slack to the timing chain.
> Anyway, let me know your thoughts and what I might check.
> Thanks!
> --Aaron--
> 95 DSRC 4x4 V6 Auto
> www.geocities.com/adakota4x4_95
> _____________________________________________________________________________________
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