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Model specific boards => Golf mk4 => Topic started by: Dempsey on 02 July 2009, 16:02

Title: high vac on tickover? i have searched, just need some clarification
Post by: Dempsey on 02 July 2009, 16:02
as above. i have done some searching, and have found out its not a vac leak.....
some people have said it could be a faulty gauge, so jus need some clarification....

i have installed my boost gauge today, and just have a few questions.
on tickover, it sits at around 30.
i recently installed a new recirculator valve too, the car seems to drive the same, just the reading on the boost gauge worries me.
Is it a possibility of a faulty gauge, or is it possibly due to the needle not sitting at 0?
its an "Auto Gauge" Boost gauge from halfords.
any help would be appreciated.
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: jamie16v on 02 July 2009, 18:05
i have one of these guages too and to be honest i think it just rests where i wants to on vac.. basically its not all that accurate..
though mine never vacs at 30.   -22 psi is probably the most it will go to..
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: Dempsey on 02 July 2009, 23:25
ah right, ok.
might make a difference if i zero my needle then?
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: jonnyturbo on 02 July 2009, 23:31
Gauge on tick over should be at minus 20 then when you put your foot down you will create the vacuum then you will get your reading in plus
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: Dempsey on 02 July 2009, 23:33
Quote from: jonnyturbo on 02 July 2009, 23:31
Gauge on tick over should be at minus 20 then when you put your foot down you will create the vacuum then you will get your reading in plus

mine is on 30 though?
so is that bad?
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: Grand Master Patch on 03 July 2009, 09:28
Quote from: Dempsey on 02 July 2009, 23:33
Quote from: jonnyturbo on 02 July 2009, 23:31
Gauge on tick over should be at minus 20 then when you put your foot down you will create the vacuum then you will get your reading in plus

mine is on 30 though?
so is that bad?

The question we need to ask is what does the gauge sit at without the engine turned on?
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: Dempsey on 03 July 2009, 11:09
the gauge sits at around just above 10 on vac, it doesnt sit at 0.
would i see a more accurate reading if i sat the needle at 0?
Title: Re: high vac on tickover? i have searched, just need some clarification
Post by: Grand Master Patch on 03 July 2009, 12:43
Quote from: Dempsey on 03 July 2009, 11:09
the gauge sits at around just above 10 on vac, it doesnt sit at 0.
would i see a more accurate reading if i sat the needle at 0?
YES :grin:

Take it back and swap it for one that works.