Possible vaccuum issue

[Galanttuner10]

so today i was doing some errands, everything was fine. i went to start the car after going to the store and saw the boost gause wasnt at 0 and was at like 4 on the vac side. driving home it felt fine but the gauge never went to 0, it would move fast to about 8 on the vac then struggle to get to about 3 on the vac and that was it. i have no idea what it could be, no weird noises, i havent touched anything motor wise in about 3 months

gauge is an autometer, i used regular vaccuum line instead of the clear line when i did it cuz i dont trust that little line, car still felt fine, any ideas???

[Stewi]

When the car is at idle, the boost gauge shouldnt be at 0, it should be in vacuum.

[4g63lover]

When the car is at idle, the boost gauge shouldnt be at 0, it should be in vacuum.

17-22" Hg in fact.

[mko]

mine holds 22-24 inches of hg. your readings are off for some reason

[Stewi]

mine holds 22-24 inches of hg. your readings are off for some reason

yeah that sounds right.

I was pulling 22 in/hg when I had my 272 cams and and +3 degrees intake cam advance
then on S2's and 0/0 cam timing I went to 19 in/hg.

[Galanttuner10]

When the car is at idle, the boost gauge shouldnt be at 0, it should be in vacuum.

i type on my way to work, the car is off and the gauge wasnt at 0, when off the gauge goes back to 0 but it only went to about 3-4, with the car on at idle tha vacuum is still 22 and on decel still 25 so i was just wondering whats going on, maybe something loose idk, it gets to about 10 then it moves very slow from then on to about 2 never back to 0, this just started today

[Galanttuner10]

should add the car still feels the same, no weird noises and still moves fine

[mko]

im lost. the gauge should be around 22 at idle and 0 (zero) when the engine is off. when you accelerate it should move toward 0 (zero). Under WOT the gauge should be ideally at 0 (zero), but it actually never gets to it unless youre boosted.

You say it gets to 3-4 then it means youre almost at WOT.

maybe youre looking at malfunctioning gauge.

[Galanttuner10]

im lost. the gauge should be around 22 at idle and 0 (zero) when the engine is off. when you accelerate it should move toward 0 (zero). Under WOT the gauge should be ideally at 0 (zero), but it actually never gets to it unless youre boosted.

You say it gets to 3-4 then it means youre almost at WOT.

maybe youre looking at malfunctioning gauge.

ok let me break it down a little better chris

car on-22 hg
car off-3-4 hg
WOT-3-4 hg

i know where the gauge used to get to and now it doesnt get there under WOT, my main thing is how it gets to like 10 hg when i floor it then moves slowly to 3-4 hg then as soon as i let off the gas it goes to 25 hg like normal

the needle doesnt go quickly to 0 at WOT like it used to, gets to 10 then moves so slow and only gets to 3-4 hg

[mko]

the gauge could be actin up from the cold. you may want to replace it in the near future

[Galanttuner10]

the gauge could be actin up from the cold. you may want to replace it in the near future

i just put this one in right before MOD. it must be the cold. if it keeps acting up when its a little warmer ill swap it out

[Galant306m]

Boost yur shit won't have that problem ad vacuum gage is pointless

Sent from my SPH-D700 using Tapatalk

[Galanttuner10]

Boost yur shit won't have that problem ad vacuum gage is pointless

Sent from my SPH-D700 using Tapatalk

mitch its an autometer boost/vac gauge

[DOHCstunr]

are you using the nylon line and brass ferruls? I suspect you have a leak in the reference line for your boost gauge. Used to happen to me all the time.
Side note, My old autometer mechanical boost gauge did start to read way off after a few years. guess the spring wore out.
I'd look into the leak before you decide its the gauge.

[Galanttuner10]

are you using the nylon line and brass ferruls? I suspect you have a leak in the reference line for your boost gauge. Used to happen to me all the time.
Side note, My old autometer mechanical boost gauge did start to read way off after a few years. guess the spring wore out.
I'd look into the leak before you decide its the gauge.

i suspect it as well as it read the vacuum just fine at idle and decl but as soon as there is pressure the other way it doesnt hold. i watch the needle bouncing back and forth as it tried to get to 0. im not using the nylon line, im using the regular rubber vacuum line ive never liked the clear thin line.

im going to inspect it soon and see if i find anything

[Galanttuner10]

ok so, upon inspection of the line, it fell down from where it was and was behind the clutch pedal and when i pushed in the clutch it hit the line and looked to have only crimped it, undid the crimp in the line, no visible cracking or anything but i taped around where it was kinked and still the same problem. im going to replace the line when it is a little warmer or i get a spot in the garage