I already got a repsonse from hoov, but I was wondering if you have smaller vaccum lines as replacements, will that cause a problem? I accidentily got a size too small for the vaccuum line for my pressure regulator, I managed to make the line fit, but I don't know if it will cause a problem? I had a friend tell me that the size of the lines does matter.

 

it matters a little. A smaller line will still read the same pressure but the repsonse time will be knocked down by a few hundreths of a second... something like that.

Go find the correct size and buy a roll of it. Its only $6-7 for about 6 feet of it right? Its the same size as the small line that runs from your carbon canister to the manifold.

 

I am down to about 4 vaccume lines now. Dizzy, gas take, pressure regulator, and one more. somewhere.

 

As long as that hose can move enough air then it's no problem. The fact that you were able to make the hose fit tells me that it's a non-issue.

It would actually be going with too large of a line that would cause a problem. If the volume inside the hose is too large then reaction time would be delayed or even suspended if the hose were large enough. The same prinicple applies to having too long of a hose.

 

I am glad this thread came up, I was wondering...couldn't I use like stainless steel brake lines for vacuum lines...or even aluminum tubing? I mean if it is near the same size as the rubber or plastic line and just use a small rubber piece as a coupler. I know they can be bent easily and should be more functional ...stiffer so less flexing or collapsing, should be more accurate right? Plus it might just look a little bit better...kinda custom don't you think? Or should I stop daydreaming?

 

yes you can use a hard line too.

 

How many vacuum lines are actually usefull?

 

Now thats a good question

 

as many as you need

 

I got rid of so many on my turbo engine. Its weird...

but, if any of them are hooked up, then they need to be in good shape because a break at either end or in the middle causes a leak. Either replace the hose with a new proper size hose or eliminate it. You can not eliminate the FPR hose though. That is a must-have.

the vaccum canister which opperates your cruise control and heater controls is 'optional' but those controls won't work. Emissions canister is also optional... on the turbo you don't need the EGR or AAC lines if you eliminate those devices off of the manifold.

 

I'm wondering if my FPR is working on my Turbo. I put new lines on it, I pull the line off and it sometimes looks like the idle may have gone up, but other times it doesn't. On my 2+2 when I'd pull the vaccum line from the FPR you could clearly hear the engine rev higher and the RPMs were noticably higher, not a lot higher, but it was definitely noticeable. Maybe the previous owner put on a faulty FPR?

 

Nice!


On topic... Replacing ALL the vacuum lines is a MUST on these 23-27 year old cars. It should be at the top of everyone's list of things to do before ever trying to diagnose or fix any kind of driveability issue.

Rod.