GolfGTIforum.co.uk

Model specific boards => Golf mk3 => Topic started by: bathspray on 22 November 2009, 16:24

Title: OBD READING A FAULT!!
Post by: bathspray on 22 November 2009, 16:24

Hi i just put my friends OBD reader onto my 16 valve mk3 gtii (p reg) and it showed the following:

INTAKE MANIFOLD PRESSURE SENSOR  (G71)   SPORADIC - NO SIGNAL


Does something need replacing if so where is it please and what??

Many thanks

Title: Re: OBD READING A FAULT!!
Post by: topher on 22 November 2009, 16:28

mk3 16Vs have a map sensor? :huh:

Title: Re: OBD READING A FAULT!!
Post by: DazVR6 on 22 November 2009, 18:36

What was the actual fault code..? how is the car running..?

Title: Re: OBD READING A FAULT!!
Post by: bathspray on 22 November 2009, 18:44

the car is idling but fluctuating from 1000 to 1200 revs on stand still

cheers

Title: Re: OBD READING A FAULT!!
Post by: topher on 22 November 2009, 21:22

leaky vacuum pipe from the intake manifold somewhere then probably

Title: Re: OBD READING A FAULT!!
Post by: bathspray on 22 November 2009, 21:27

Thanks ill check it all out and get a post result on!!

Title: Re: OBD READING A FAULT!!
Post by: AntAfram on 26 November 2009, 13:23

i have the same issue but it's only started hasppening since i replaced the coil and ht leads. idles between 500-1200 rpm. vagcom reads intake manifold pressure sensor
(g71). can't see any breaks in the vac pipes. what do i do now????

cheers

Title: Re: OBD READING A FAULT!!
Post by: Paul86S2 on 26 November 2009, 14:35

The 16v map sensor is part of the ecu. The vacuum pipe from the manifold to the ecu gives it the reading. So first idea would be to check the vacuum pipe. See if it is split, take it off and blow through it to see if it is blocked. Best course of action is just to replace it because it could be collapsing under vacuum.

Paul

Title: Re: OBD READING A FAULT!!
Post by: justalex81 on 26 November 2009, 23:17

antafram is my cousin and it was me that had the problem. replaced the whole vac hose and it now purrs like a dream and is now a lot smoother and faster since the coil and leads.