Please check your vacuum lines!
#1
Senior Member
Posts like a 4 Banger
Thread Starter
Join Date: Jul 2004
Location: Woodbridge, NJ
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
![SD-421 is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
I recently looked under the hood thinking about what to do as in engine detailing and painting. For the up and coming Pontiac day next year at Englishtown,NJ.
I glanced over at the fuel pressure regulator(because it is shinney) and bam.
I had a perforrated vacuum line to the pressure regulator. Didn't hear a peep from the engine in regards to a vacuum leak, car ran and started fine, the idle was a slight bit lumpy but just alittle with 116k plus thought it was normal.
I look around my tool box and found some vacuum hoses, I had to slip the skinny one into the fatter one because the ends of fittings are different sizes.
Buttoned it up and took her for a spin, noticed a big difference right away in response even squealled the left front tire a bit.
So when checking your vacuum just don't look at them, apply pressure to them bend them check for cracks and perforrations.
My tip for the day.
I glanced over at the fuel pressure regulator(because it is shinney) and bam.
I had a perforrated vacuum line to the pressure regulator. Didn't hear a peep from the engine in regards to a vacuum leak, car ran and started fine, the idle was a slight bit lumpy but just alittle with 116k plus thought it was normal.
I look around my tool box and found some vacuum hoses, I had to slip the skinny one into the fatter one because the ends of fittings are different sizes.
Buttoned it up and took her for a spin, noticed a big difference right away in response even squealled the left front tire a bit.
So when checking your vacuum just don't look at them, apply pressure to them bend them check for cracks and perforrations.
My tip for the day.
![Idea](https://www.gmforum.com/gm/images/smilies/icon_idea.gif)
![Idea](https://www.gmforum.com/gm/images/smilies/icon_idea.gif)
#3
Senior Member
Posts like a Turbo
Join Date: Apr 2004
Location: Sheridan Wyoming
Posts: 210
Likes: 0
Received 0 Likes
on
0 Posts
![57chevythunder is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
![Smile](https://www.gmforum.com/gm/images/smilies/smile.gif)
![Smile](https://www.gmforum.com/gm/images/smilies/smile.gif)
-and I find it interesting to think about what potential effects (if any) that would likely occur with that vacuum line completely off. AND your expressing that everything was still running just fine is exactly what I'd expect. Here is why: with that particular line disconnected, the regulator increases the fuel rail pressure by 10 psi (from about 40psi to 50psi) -which should not cause any changes in engine operation. Also, the small amount of vacuum leak caused by that small line will also not affect normal engine operation. (-even at idle.)
![Exclamation](https://www.gmforum.com/gm/images/smilies/icon_exclaim.gif)
![Exclamation](https://www.gmforum.com/gm/images/smilies/icon_exclaim.gif)
So, in my mind, that lends even more importance to your good advice of checking things over thoroughly.
![Wink](https://www.gmforum.com/gm/images/smilies/icon_wink.gif)
PS.
![Cool](https://www.gmforum.com/gm/images/smilies/icon_cool.gif)
#5
Member
Posts like a V-Tak
Join Date: Jul 2004
Location: Detroit, MI
Posts: 49
Likes: 0
Received 0 Likes
on
0 Posts
![beakah is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Great tip...
I found both of mine on the throttle body completely cracked. Had to go to the dealer to get the replacements. Car ran shaky too...all good now.
I found both of mine on the throttle body completely cracked. Had to go to the dealer to get the replacements. Car ran shaky too...all good now.
#8
Senior Member
True Car Nut
Join Date: Aug 2004
Location: In your garage, swipin' da lug nutz
Posts: 3,067
Likes: 0
Received 1 Like
on
1 Post
![sandrock is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
After owning several turbocharged cars, I made it part of my weekend routine to check all the vac lines, as they would also carry positive pressure under boost...which means lost boost if they went bad :( .
Speaking of turbo cars, I found a turbo Grand Prix just languishing here in the area. How common or rare are those?
Speaking of turbo cars, I found a turbo Grand Prix just languishing here in the area. How common or rare are those?
Thread
Thread Starter
Forum
Replies
Last Post
brminder
Performance, Brainstorming & Tuning
2
12-23-2002 05:03 AM