[DMCForum] Vacuum experiment....
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[DMCForum] Vacuum experiment....



Ok, I don't wanna keep you from quality Ford time....

You're either not reading my posts or you don't follow them. There 
*is* a path from the valve cover into the induction system through 
the cold start pipe engine via the oil filler breather. 

Do you know the meaning of vapor pressure? There is a huge difference 
between pulling in a little air and shooting something with a vapor 
pressure of carb cleaner into the induction system, not to mention 
it's hydrocarbon based. It's a very volatle substance and flashes 
very quickly into a vapor.

In other words, if the vacuum leak altered the engine's operation 
enough you wouldn't need the carb cleaner to find it. Of course 
you're gonna see a change, especially when you aim it up towards the 
breather in the valve cover. A direct measurement  of the pressure in 
the valve cover is the only way to be accurate, you can't cheat by 
using an substance that will drastically effect the engine's mixture. 
After all, *thats* why you use it to find....vacuum leaks! (I hate 
that term, there is no "vacuum" leaking into the induction system.)

So your carb cleaner is getting into the induction system via the 
cold start pipe and makes a much greater difference than a little air 
would. This will happen anywhere you spray it around the valve/timing 
covers where there is a path to the inside. In effect it *is* a good 
way to find leaks, but you're finding leaks that make no little or 
difference in manifold pressure. Try disconnecting and plugging the 
vacuum line to the cold start pipe and then see if the solvent has 
any effect, thats a direct path into the manifold.



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