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Subject: "Need a little help. Boost gauge showing just below 0 vacuum at idle" Previous topic | Next topic
devvinFeb-12-09 07:25 AM
Member since Mar 18th 2004
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#124013, "Need a little help. Boost gauge showing just below 0 vacuum at idle"




          

Hey folks, My eclipse has been sitting for about 5 months now (for no good reason. haha). I finally drove it last week. When I started it, I noticed that at idle, my boost gauge is reading one notch below 0 vacuum. I figured that maybe it's just because I haven't driven it in so long. To my dismay, that wasn't the case. I've been driving it for the last week and things haven't gotten any better. When I'm driving it, it seems fine, other than the car not having as much "get up and go" as it normally did. Something else I noticed, which only occurs at idle, is that my fuel pressure gauge is reading high. I've got a greddy fuel pressure gauge, so it lists the fuel pressure in kg/cm2. Normally it sits just below 3.5, but now at idle it sits at 4.0. Once I start driving it's fine. At first I thought I must have a vacuum leak, but I've taken it to two different shops in the last week and neither one can find any vacuum leaks. I'm really confused as to why it's started to act like this.

I've searched the boards and found some possible things to check: O2 sensor, coolant temp sensor, tps, and iac. I'm just wondering if anyone has any other ideas of things this could possibly be? The idle seems a tad low at around 600rpm. My zeitronix shows A/F at 14.7 at idle. Like I said, I'm a bit confused. Combine that with the fact that I'm totally strapped for cash because I'm trying to buy a home, I'd like to get some opinions from you guys that really know what you're doing with our cars so that I can possibly save myself from throwing away money by my guessing. I'd really appreciate any input you may have.

Thanks a lot. Sorry for the long post.


'99gs with some "T": -HRC 20g-FMIC-Portfueler-500cc secondaries-stock primaries-Walbro 255lph fuel pump-p&p intake manifold, p&p head-5 angle valve job-Crane #14 cams-Fidanza adjustable cam gears-PT Cruiser lash adjusters and followers-Crane valve springs-ARP head studs-Built bottom end-JE 8.6 forged pistons-Eagle H-beam rods-Clevite bearings-Total Seal piston rings-Melling oil pump-solid front engine mount (XtremeRS-Matt)-prothane side and rear inserts-Fluidyne radiator-F-A-L slim fans-Thermal R&D 3" cat-back exhaust-HRC eliminator 3" dp-3" hi-flow cat-Greddy type RS bov-Greddy profec B spec-2 electronic boost controller-MSD DIS-2 programmable ignition-Optima red top (in trunk)-Zeitronix Zt-2 wideband A/F meter/datalogger-Greddy gauges: 60mm p/h: boost,egt,a/f- 52mm: oil pressure, fuel pressure-Nology Hot wires-Denso plugs-Missing Link-Eibach pro-kit springs-KYB AGX adjustable shocks-18" Falken Torque 5 (gunmetal)-Falken Ziex 512 225-40-18-empty wallet : (

to do list: brakes, paint, interior


http://www.cardomain.com/ride/570859


Originally posted by thedawg
Get the goddamn fucking right plugs and set the goddamn fucking right gap. Maybe throw in a goddamn fucking stock coil pack, and read the goddamn fucking chiltons.

  

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Replies to this topic
RE: Need a little help. Boost gauge showing just below 0 vacuum at idle, eclipse982nrRST, Feb-12-09 08:42 AM, #1
RE: Need a little help. Boost gauge showing just below 0 vacuum at idle, devvin, Feb-12-09 09:17 AM, #2
      RE: Need a little help. Boost gauge showing just below 0 vacuum at idle, Warmage12, Feb-12-09 09:43 AM, #3
      RE: Need a little help. Boost gauge showing just below 0 vacuum at idle, devvin, Feb-12-09 10:45 AM, #4
      RE: Need a little help. Boost gauge showing just below 0 vacuum at idle, djtrickee, Feb-12-09 10:30 PM, #5
           RE: Need a little help. Boost gauge showing just below 0 vacuum at idle, Mopar McNeer, Apr-05-09 10:40 PM, #6

eclipse982nrRSTFeb-12-09 08:42 AM
Member since Mar 16th 2004
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#124014, "RE: Need a little help. Boost gauge showing just below 0 vacuum at idle"
In response to Reply # 0


          

I would deff think it would be a cracked vacuum line or something. Have you tried checking it yourself?

-MIKE-

Stroked 2.2L

  

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devvinFeb-12-09 09:17 AM
Member since Mar 18th 2004
64 posts,
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#124015, "RE: Need a little help. Boost gauge showing just below 0 vacuum at idle"
In response to Reply # 1




          

I know I sound stupid, but how would I go about checking for a cracked vacuum line? Thanks a lot.


'99gs with some "T": -HRC 20g-FMIC-Portfueler-500cc secondaries-stock primaries-Walbro 255lph fuel pump-p&p intake manifold, p&p head-5 angle valve job-Crane #14 cams-Fidanza adjustable cam gears-PT Cruiser lash adjusters and followers-Crane valve springs-ARP head studs-Built bottom end-JE 8.6 forged pistons-Eagle H-beam rods-Clevite bearings-Total Seal piston rings-Melling oil pump-solid front engine mount (XtremeRS-Matt)-prothane side and rear inserts-Fluidyne radiator-F-A-L slim fans-Thermal R&D 3" cat-back exhaust-HRC eliminator 3" dp-3" hi-flow cat-Greddy type RS bov-Greddy profec B spec-2 electronic boost controller-MSD DIS-2 programmable ignition-Optima red top (in trunk)-Zeitronix Zt-2 wideband A/F meter/datalogger-Greddy gauges: 60mm p/h: boost,egt,a/f- 52mm: oil pressure, fuel pressure-Nology Hot wires-Denso plugs-Missing Link-Eibach pro-kit springs-KYB AGX adjustable shocks-18" Falken Torque 5 (gunmetal)-Falken Ziex 512 225-40-18-empty wallet : (

to do list: brakes, paint, interior


http://www.cardomain.com/ride/570859


Originally posted by thedawg
Get the goddamn fucking right plugs and set the goddamn fucking right gap. Maybe throw in a goddamn fucking stock coil pack, and read the goddamn fucking chiltons.

  

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Warmage12Feb-12-09 09:43 AM
Member since May 24th 2008
168 posts,
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#124016, "RE: Need a little help. Boost gauge showing just below 0 vacuum at idle"
In response to Reply # 2




          

either a) physically look at the lines for a hole. Or b) replace all lines with new lines to be sure they are fine.

As a part of option a) you might wanna check for kinks in the line. Places were it might have gotten pined or pinched against two objects.

Your car idles normal otherwise right? If your car runs fine then its just something to do with the vaccum line or even the gauge itself.

ps, were have you tapped into to get your vaccum from. just a minor thing to consider too.
I love my car...
I love Horsepower...
I love reliability...
So why do i own a DSM again?

  

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devvinFeb-12-09 10:45 AM
Member since Mar 18th 2004
64 posts,
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#124018, "RE: Need a little help. Boost gauge showing just below 0 vacuum at idle"
In response to Reply # 3




          

Thanks. I'll check it out when I get home tonight.


'99gs with some "T": -HRC 20g-FMIC-Portfueler-500cc secondaries-stock primaries-Walbro 255lph fuel pump-p&p intake manifold, p&p head-5 angle valve job-Crane #14 cams-Fidanza adjustable cam gears-PT Cruiser lash adjusters and followers-Crane valve springs-ARP head studs-Built bottom end-JE 8.6 forged pistons-Eagle H-beam rods-Clevite bearings-Total Seal piston rings-Melling oil pump-solid front engine mount (XtremeRS-Matt)-prothane side and rear inserts-Fluidyne radiator-F-A-L slim fans-Thermal R&D 3" cat-back exhaust-HRC eliminator 3" dp-3" hi-flow cat-Greddy type RS bov-Greddy profec B spec-2 electronic boost controller-MSD DIS-2 programmable ignition-Optima red top (in trunk)-Zeitronix Zt-2 wideband A/F meter/datalogger-Greddy gauges: 60mm p/h: boost,egt,a/f- 52mm: oil pressure, fuel pressure-Nology Hot wires-Denso plugs-Missing Link-Eibach pro-kit springs-KYB AGX adjustable shocks-18" Falken Torque 5 (gunmetal)-Falken Ziex 512 225-40-18-empty wallet : (

to do list: brakes, paint, interior


http://www.cardomain.com/ride/570859


Originally posted by thedawg
Get the goddamn fucking right plugs and set the goddamn fucking right gap. Maybe throw in a goddamn fucking stock coil pack, and read the goddamn fucking chiltons.

  

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djtrickeeFeb-12-09 10:30 PM
Donating 2GNT member
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#124024, "RE: Need a little help. Boost gauge showing just below 0 vacuum at idle"
In response to Reply # 2




          

Originally posted by devvin
I know I sound stupid, but how would I go about checking for a cracked vacuum line? Thanks a lot.


So... you bought the car already built up and turbo'd huh?

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

  

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Mopar McNeerApr-05-09 10:40 PM
Member since Apr 03rd 2007
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#124993, "RE: Need a little help. Boost gauge showing just below 0 vacuum at idle"
In response to Reply # 5




          

Sounds like a vac leak to me. Probably a cracked hose or a hose has pulled off a nipple somewhere.

You might have to pull off each line and inspect them to find the cracks or tears.

95 Avenger 2.0 - Hahn 16g, DMS 8 injector setup, UDP, Big FMIC, HKS SSQV, MSD Coil & Wires,
ZEX Nitrous System, QTP Cut Out, Mandrel 2.5" Exhaust with cat delete, MP 60mm TB...and tons of Carbon Fiber

  

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