help diagnosing new vac. readings

jaymac

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Feb 18, 2004

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Northern Mass

Aug 12, 2005

#1

• Aug 12, 2005

• #1

So this morning I checked vac readings w/ the mitivac again for shiiits and giggles, and tried a few new ports. This time, it fluctuated extremely rapidly between 18-19, the between 18.5 and 19. The needle was a blur between the numbers, and never steadied out, even after a few minutes. A few nights ago, it was steady @ 19 ish. Now it's going haywire.
Any ideas as to why or what to do first?
Thanks as always,
J

 

jaymac

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Feb 18, 2004

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Northern Mass

Aug 12, 2005

#2

• Aug 12, 2005

• #2

bump

 

QDRHRSE

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Dec 31, 2002

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Palmdale, CA

Aug 12, 2005

#3

• Aug 12, 2005

• #3

If you can tell that its steady between 18-19 then don't worry about it. If it fluctuates between 14-19 wildly then be concerned.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Aug 12, 2005

#4

• Aug 12, 2005

• #4

A lot of it depends upon where the gauge is hooked up, in terms of seeing slight pulsing of the needle. Some spots see more 'buffered' readings.

In general, a tiny twitch like that can be considered normal or can be attributed to a slight ignition glitch.

What happens if you connect the source hose where you had it initially? If it goes back to normal, I would not sweat it.

Good luck.

 

jaymac

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Feb 18, 2004

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Northern Mass

Aug 12, 2005

#5

• Aug 12, 2005

• #5

I tried once @ the front of the intake where the charcoal canister connect, then once on the A/C port on the tree, which is right next to the line I tried yesterday.
I will try the initial port again, then report back...

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Aug 12, 2005

#6

• Aug 12, 2005

• #6

Sounds good. Also, if you slightly pinch the vac line, that can quell the reading (it can be very normal for it to fluctuate a little, like yours does. You just want to make sure the range of fluctuation is very small). The adapter fittings that come with the kit often do this too (dampen readings).

If you feel like it, Google vacuum gauge charts. I once found one that had animated readings (like it showed how the gauge fluctuated in real time) and told you what they meant. I look in my saved stuff for several minutes to post the link and cant find it (dial up sucks for doing internet searches or I would find it again).

 

jaymac

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Feb 18, 2004

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Northern Mass

Aug 12, 2005

#7

• Aug 12, 2005

• #7

you have 11,758 posts w/ dial-up???????
Wow, just imagine how many you'd have w/ DSL?!!?

 

jaymac

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Feb 18, 2004

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Northern Mass

Aug 12, 2005

#8

• Aug 12, 2005

• #8

I tried to goolge vaccharts, but got 7 million pop-ps instead (virus problems).
Anyway, I hooked it up again and it sat between 20 and 19.5 again, buzzing back and forth between the two. I didn't get to try any tricks or variations, because it started downpouring on me
Maybe later!

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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Aug 12, 2005

#9

• Aug 12, 2005

• #9

That reading sounds great. Sorry you could not find the chart I was talking about. I couldnt either - it was kinda neat. Ill look later.

Yeah, internet searches suck because every given page takes 5 minutes to load. I dont even want to try or see DSL or cable because it will make me unhappy. It would be like if someone never drove anything but a stang - he/she thinks it is fast. If he/she rode in a Viper or something, he/she would think of the stang as a slug afterwards.

 

jaymac

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Feb 18, 2004

995

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Northern Mass

Aug 12, 2005

#10

• Aug 12, 2005

• #10

yeah, that damn ride I took in a 600 hp Viper last year tainted me.
The 700 hp Supra didn't help too much either...