[s-cars] update - was ping vs. rattle

[John Cody Forbes]

Sounds a bit like a rod knock except the part about getting louder on warmup.

-Cody (mobile)

On Jan 26, 2011, at 10:47 PM, james McCarthy <jjssmccarthy at yahoo.com> wrote:

> Thanks to all those who chimed in so far.
> 
> So here's what happening:
> 
> It's evolving... began with rattle/clatter/ping noticeable at 2800-3200 - didn't hear with WOT - I thought (perhaps) because I was just blasting through it.
> It's growing in volume (and RPM range now at 18000) to a very audible and and become more rhythmic tick - almost valve like but more regular and stronger with the occasional valve clatter I've gotten when the oil got a tad low (down a quart). Can also faintly also hear it with falling RPM (off throttle) where as before you had to be on the gas.
> 
> While standing with the hood up and modulating the throttle it really sounds like it's coming from the head to me - released the serp belt (no change). Still don't hear it at idle - but perhaps I will soon...
> 
> It's definitely RPM related in frequency - no difference with clutch in or when stationary. 
> 
> Several listers speculated headgasket failure - for a little background I replaced the head gasket 1 year ago and put new lifters in at that time. Compression is 130 in all 5 with no coolant loss and no washing machine cleaning effect on any of the spark plugs - so HG seems less likely (no way to check leak down at home).
> 
> Doesn't seem like exhaust leak - stromung with no heat shields - as it sounds higher up. All exhaust studs are in place (wagner RS2 unit).
> 
> One last tidbit is it seems to get louder once the car is warmed up.
> 
> So where to go from here? Tempted to tear off the valve cover but if everything looks OK what next.
> 
> Any thoughts you have would be greatly appreciated.
> 
> Thanks
> -jamie
> 
> 
> 
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