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Low vacuum
#1
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Mail From: dano (Dan O'Reilly)

Aside from the obvious (leaking manifold, etc), what can cause low vacuum
in an engine? The vacuum in mine is low by about 25% (289 2V).

---

Dan O'Reilly
1966 Nightmist Blue Pony Coupe
2002 Black Deluxe Convertible
Colorado Springs, CO




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Low vacuum
#2
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Mail From: walt (Walt Boeninger)

Valve adjustment, worn/burned valves, worn rings, cam timing
(IE jumped or wrong to begin with) ......

A leakdown test will help narrow it down.

Walt
----

Dan O'Reilly wrote:

> Aside from the obvious (leaking manifold, etc), what can cause low
> vacuum in an engine? The vacuum in mine is low by about 25% (289 2V).
>
> ---
>
> Dan O'Reilly
> 1966 Nightmist Blue Pony Coupe
> 2002 Black Deluxe Convertible
> Colorado Springs, CO
>
>
>


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Low vacuum
#3
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Mail From: KalliPa1 ((email redacted))

Check out all your vacuum lines first before digging into the big stuff.
A lot of times they have small holes from age and vibrations in the car
too. Then go to the more complicated items with a leak down test etc.
Compression tests can tell ya if you got the pressure.
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Low vacuum
#4
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Mail From: dano (Dan O'Reilly)

I was afraid you were going to say that. I know the timing is right (I set
that myself after replacing the timing chain), but I didn't do the heads
when I had the engine out of the car. Looks like I'll be doing them this
summer...*sigh*...

At 09:50 AM 5/1/2006, Walt Boeninger wrote:
>Valve adjustment, worn/burned valves, worn rings, cam timing
>(IE jumped or wrong to begin with) ......
>
>A leakdown test will help narrow it down.
>
>Walt
>----
>
>Dan O'Reilly wrote:
>
>>Aside from the obvious (leaking manifold, etc), what can cause low vacuum
>>in an engine? The vacuum in mine is low by about 25% (289 2V).
>
>---
>
>Dan O'Reilly
>1966 Nightmist Blue Pony Coupe
>2002 Black Deluxe Convertible
>Colorado Springs, CO
>



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Low vacuum
#5
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Mail From: dano (Dan O'Reilly)

I did check the vacuum lines, they're all OK. I've been suspecting the
valve train, frankly.

At 09:53 AM 5/1/2006, (email redacted) wrote:
> Check out all your vacuum lines first before digging into the big
> stuff. A lot of times they have small holes from age and vibrations in
> the car too. Then go to the more complicated items with a leak down test
> etc. Compression tests can tell ya if you got the pressure.
>_______________________________________________
>Classic-mustangs mailing list
>(email redacted)
>lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs
>
>Visit the Classic Mustang Wiki! sauce.donair.org/~cm/

---

Dan O'Reilly
1966 Nightmist Blue Pony Coupe
2002 Black Deluxe Convertible
Colorado Springs, CO




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