A spark plug coming�out completely will get your attention.� My only experience with that was riding back from a high school debate tournament in a '62 Ford wagon with a nun driving when a spark plug blew out while on I-95 and dented the hood from the underside.� Sounded like a machine gun with that inline 6 engine still running. 
�
Stephen

--- On Wed, 5/16/12, Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM> wrote:

From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Front Header for Cyls #1 & #3 Wanted - NOT!
To: vanagon@GERRY.VANAGON.COM
Date: Wednesday, May 16, 2012, 8:01 PM

fwiw ,...
it's not that uncommon for me to find spark plugs that aren't screwed in
tightly enough.
the pffft , pffft should is a tip off. ...that's before it falls out
completely.

On 5/16/2012 2:52 PM, JRodgers wrote:
> I posted a request for one of these a while back and a number of list
> members responded. I want to apologize to those who did for not getting
> back to you. I am moving - have moved - to new housing and have been
> just covered up with getting it done and have been off line. In the mean
> time the van went to the shop, and it was found that a spark plug had
> come out. Put the plug back in and the van is fine. But in 50 odd years
> of driving that was a first for me.
>
> My thanks to all who responded.
>
> John Rodgers
> Birmingham, AL
>