Re: [T3] Diagnostic help: Loud popping...Àvalve problems?

["Drake ." <vw_type3@hotmail.com>]

<x-flowed>Some other ideas here, I dunno if you have it figured out or not yet. As Jim 
(i believe it was Jim) said if the valve lash is correct, and everything 
moves correctly, then the valves are likely ok. You said that you turned the 
engine over by hand and the valve train appeared to work correctly, I assume 
there were no other ugly noises.

Is the car really backfiring? You know the really LOUD backfire...KER-POW. 
Is is out the exhaust or the carbs? or both?

Can you crank over the car with the starter (not start it) and listen for 
any unwanted noises? If there are no unwanted noises then the problem would 
have to lie with the actual suck/squish/boom/blow

1. Did you blow out an exhaust gasket?
2. Break the exhaust in some fashion, broken weld etc.
3. Somthing stuck in the carbs blocking a jet? Lean cylinder?
4. Cracked valve seat or burned exh valve + leaky exhaust?

I hope everything turns out ok, ill send ya positive vibes :)

Drake
72 square (stock)
63 bug (darkside)
San Jose, Ca.

> >2 things. The carbs were slightly loose at the heads, and further, the
> >throttle shaft bushings were shot, causing MAJOR air intake. Bought a new

> oblige.  When we leave the tunnel there's suddenly this loud popping 
sound
> coming from the exhaust.  I mean LOUD, like backfiring.  I have
> acceleration, but it's not as powerful as normal now, and there's the
> backfiring.  The engine backfires at idle as well.  Only under very, very
> slight throttle does the backfiring stop (from what I can hear).
> Battery is good, all four plugs are firing, valve lash is correct, rocker
> arms and push rods move (I rotated the engine 'by hand' and watched them
all


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