Vaccum at Idle on boost Gauge

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Mar 2, 2010, 04:02 AM

#16

MR:PartyPete

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I noticed mine does the same but only after long trips on the interstate. Drives the same just figured something gets warmer than usual

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Mar 2, 2010, 03:33 PM

#17

wasabisnooter

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Quote:

Originally Posted by Fast_Freddie

Mine is inHG also and I read 10 at idle, however I also have cams and boost fine...

Stock cams in mine. It use to read about 19 at idle, now about 9-10

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Mar 2, 2010, 03:34 PM

#18

keeler

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I have aftermarket cams and still read 15 at idle. If you're only reading 10 that seems awful high. I've always had Evo's between 14 and 20

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Mar 2, 2010, 07:25 PM

#19

wasabisnooter

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Quote:

Originally Posted by keeler

I have aftermarket cams and still read 15 at idle. If you're only reading 10 that seems awful high. I've always had Evo's between 14 and 20

I know its high and i don't think i have a bost leak cuz i hold 24psi just fine

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Mar 2, 2010, 11:33 PM

#20

oldevodude

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Maybe I'm mistaken but if you have a hose leak on one of the smaller lines your vacuum would read lower due to the lost pressure from a leaky hose. you might want to check vacuum lines on throttle body as mine used to blow off and I would not boost above 24-25 psi. Zip tied the line and all is good.

I'm not saying this is your problem in so much as something to check out.

pretty sure I'm around 19psi vacuum at idle

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Mar 3, 2010, 06:05 AM

#21

wasabisnooter

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Yeah i'll check it out, cuz the boostin isn't the issue. I just don't see with stock cams that it should read that high in the vacuum

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Mar 5, 2010, 10:21 PM

#22

BLK_EvIL

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I would do a boost test for sure because you can still boost with a leak its just your turbo works alot harder and you loose metered air with the leak so you loose power because your afr are off

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Mar 6, 2010, 03:42 AM

#23

wasabisnooter

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Quote:

Originally Posted by BLK_EvIL

I would do a boost test for sure because you can still boost with a leak its just your turbo works alot harder and you loose metered air with the leak so you loose power because your afr are off

I know about that but afr's are dead on as well.

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Mar 6, 2010, 07:29 AM

#24

bbyevo8u

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Quote:

Originally Posted by LetsGo82nd

I searched around and couldn't find anything exactly like the issue I am having. This morning I noticed that at idle the boost guage was reading a 10 vaccum, which is much more than normal. While driving it will only spike to about 10psi. The MBC is set to peak at 25psi. I am thinking it has to be a boost leak but wanted to check with the experts before I start troubleshooting? Thanks for the help.

do you have cams? if so its normal!

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Apr 26, 2011, 06:08 PM

#25

Freshstart

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I am having same issue, this is my first EVO, but not my first 4g63, let me know how things work out, im thinking I have some vacuum lines hooked up wrong, let me know how things work out for you. I will let you know if I find something out.