Fuel pressure solenoid/boost gauge q

[dikdiamond]

I installed an Autometer Sport Comp boost/vacuum gauge a few days ago. At idle my gauge is reading 0,and under acceleration drops to the 15-18 range. When I let off the gas it goes right back to 0. When I get on it a bit my boost is about 6-8 psi(I have an automatic). Now on to the fuel pressure solenoid...I was nosing around to see if any of the vacuum lines might have had a hole in them,and I noticed that the end that is supposed to go into the intake manifold(correct?) is attached to nothing,it's just hanging there. Is it supposed to be connected to the manifold? Will this hose not being connected cause my gauge to act like this? When I get more time I'm going to do a boost leak test,I know I'm not supposed to be at 0 at idle. I've added a MBC but I'm not messing with it until I get this fixed. I'm a novice when it comes to cars but thanks to this site and my Chilton's and Haynes manuals I'm learning alot. I can't seem to find anything on here about this. The pic below shows what I'm talking about. Thanks

 

[kenamond]

I'm a 2g guy, and it's different, but here's the 1g how-to from vfaq.

http://www.vfaq.com/mods/wayback/BradBauer/gauges/boost.html

 

[Dream On]

That would be a boost leak. Look under the intake manifold. That's probably where it goes. There's a bracket under there that connects vacuum lines to the other side of the manifold. It's hard to see and get to somewhat, so just feel around under there.

 

[dikdiamond]

@ Kenamond this actually is the guide I used for my install(plus used a pic in my initial post)http://www.roadraceengineering.com/instructions/vdoboostgaugeinstructions.htm I never looked for a vfaq on a gauge install Thanks though

@Dream On I noticed the lines by the battery and wondered if they were linked to the other side. You say they are underneath the manifold? I'll def check tomorrow after work,maybe it just pulled off the bracket. I did have a new timing belt and pulley put on a few weeks ago,maybe it happened then.

 

[dikdiamond]

I checked out my installation of the gauge,and I put the "T" on the EVAP solenoid...I feel like an ass...once that was changed I started her up and the gauge read 18-20 inhg at idle. Took it for a test drive,read about 10-15 inhg at about 50mph. Boost about 5-6 psi. Geez how could I make something so easy into something so hard? Thank you kenamond,I checked over that vfaq article and wondered if I had tapped the right line after reading it. Only thing is now I need to reconnect the EVAP line that connects under the manifold. I can see the brackets from the battery side of the engine compartment,but none look unplugged. The line might be cut,I'll have to look tomorrow. Will the EVAP not being connected have an noticable effects on my car? I know it conncets to the charcoal canister. Thanks again kenamond and dream on

 

[Dream On]

It's a boost leak. Boost leaks are bad. They let out metered air while boosting which makes your turbo work harder, and it also drives up your injector duty cycle. What you're looking for is a metal bracket that connects the intake manifold to the block. There are 2 (I think) metal tubes with nipples on each side (driver and passenger) that connect the lines. Plug in the one that isn't connected.

Also if the car is only making 6-8 psi, you should perform a real boost leak test.

http://vfaq.com/mods/ICtester.html

 

[dikdiamond]

Thanks,if the rain holds off I'm gonna check for that bracket...I found a vacuum schematic in my Haynes manual that shows the EVPA going to a bracket of two tubes,the other being the fuel pressure solenoid. And def need to get a boost leak done,thanks for the link. Being that my car is an auto,though,isn't 6-8 psi about normal?

Edit:I looked through the forums a bit more on auto boost psi and found that I can indeed get more. I'm going to replace some of my vac lines this weekend,and make that boost leak tester

Edit2:Instead of trying to put the line on the bracket I ran it to the other side,bypassing the bracket altogether. Going to go check it out now