Stock 3.2 vacuum

[Joeride9]

Can any one tell me what a good vacuum range is? I am getting 8 inches and I want to know if that is the norm.
Thanks Joe D

[Flat Six]

'Normal' varies by engine load -- idle, WOT, decel, etc. Nothing special about the 3.2 compared to other engines re: interpreting vacuum; try here:

http://www.actron.com/publish/2004/06/07/pdf_english_16176.pdf

HTH

[Joeride9]

Looking for idle vacuum

[Sunriseinla]

I measured 2 cars (hot, idle @ 880rpm) a while back:

'87 3.2l with cat bypass (113k miles): 58kPa vacuum
'89 3.2l stock (91k miles): 52kPa vacuum

Cheers,
Mark

[Flat Six]

Originally Posted by Joeride9

Looking for idle vacuum

Assuming your gauge is connected correctly, at idle 8 in. Hg suggests fairly large vacuum leak; a steady 15-22 inches would be desired.

FYI, 52-58 kPa (kiloPascal) = 15-17 in. Hg

Again, I'd suggest you take a look at the link I posted earlier, it does provide some useful diagnostic steps and standards.

[Joeride9]

Thank you guys will look for leaks and try another Gage . Car idles smooth.

[arbita1]

I'm going off memory right now, but i think the bentley manual has the vacuum testing specs in it.

[Tippy]

I measured 2 cars (hot, idle @ 880rpm) a while back:



'87 3.2l with cat bypass (113k miles): 58kPa vacuum

'89 3.2l stock (91k miles): 52kPa vacuum



Cheers,

Mark

That's around what my car does. It's good to see other cars in my range because I've been thinking I have a vacuum leak.

Maybe I don't afterall.

[Tippy]

I'm going off memory right now, but i think the bentley manual has the vacuum testing specs in it.

If you could find those numbers, I'd appreciate it.

To the OP, 8 in/hg is too low. You must have a leak somewhere.

All of the vacuum lines come from the back of the plenum under the throttle body. After that, there is 2 gaskets and 1 insulator per cylinder under the intake. I had 3 insulators that were crumbling.

[Joeride9]

I have sprayed starter fluid in all those spots and have come up with nothing. Car idles great. With or without the o2 plugged in.

[Tippy]

Bump for factory vacuum numbers

[kidrock]

I have read that the bottoms of the intakes may not always respond to spraying. Unfortunately, it's one of those deals where you may need to remove the intakes in their entirety to have a look at all those gaskets and spacers.

[Tippy]

Originally Posted by kidrock

I have read that the bottoms of the intakes may not always respond to spraying. Unfortunately, it's one of those deals where you may need to remove the intakes in their entirety to have a look at all those gaskets and spacers.

I thought that very same thing before that maybe the spray cannot reach down below the shroud. Good to know.

[Tippy]

Just got some readings this morning @ about 50 degrees:

Idle (880 RPM) - 52 kilopascals
Off idle (1200 RPM) - 60 kilopascals
Decel - 80 kilopascals