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Model specific boards => Golf mk4 => Topic started by: caddy on 15 April 2017, 19:53

Title: HELP with my 1.8 t
Post by: caddy on 15 April 2017, 19:53

Hi can anyone help me ive got 2000 mk4 golf gti 1.8t.  150bhp  Sometimes it boost and then it doesnt boost i have changed coil pack, diverter valve, n75 valve, i have checked pipes best i can as i havent got an air line. when i put new n75 valve on could hear swerling noise so put old one back on and no swerling noise but what ever i do still no boost properly didnt think it would be boost leak as still have boost that works when it wants but im new to turbo cars please can anyone help

Title: pls help mk4 golf
Post by: caddy on 15 April 2017, 20:36

got code p1287 turbo bypass valve open where is it   :undecided:

Title: Re: pls help mk4 golf
Post by: barrym381 on 16 April 2017, 13:45

Delete it then see if it comes back  :smiley:

Title: Re: pls help mk4 golf
Post by: caddy on 16 April 2017, 23:21

do you know where it is. my car gone slow :cry:

Title: Re: pls help mk4 golf
Post by: Mr_Orange on 17 April 2017, 19:59

Quote from: caddy on 16 April 2017, 23:21

do you know where it is. my car gone slow :cry:

Delete the fault code.....

Sounds like you have access to a code reader?

Title: Re: HELP with my 1.8 t
Post by: caddy on 17 April 2017, 22:13

i have delete it so many times it comes back so there must be a problem

Title: Re: HELP with my 1.8 t
Post by: lemski on 18 April 2017, 08:22

Id have thought its refering to the n75 or recerc valve.
What id do if it was mine is replace vac pipes with silicone and delete things that arnt need. Leaves you sith 4 vac lines.
If youve tried a n75 id see if you can get hold of a recerc valve to try

Title: Re: HELP with my 1.8 t
Post by: caddy on 18 April 2017, 09:26

am new to turbo cars :nerd:i put new n75 on now i can hear the turbo more but still the same was going to get new dv today to see if that helps.am not sure what pipes your talking about what i should changes.thanks for helping with this

Title: Re: HELP with my 1.8 t
Post by: itavaltalainen on 18 April 2017, 13:27

Log measuring blocks to see when (under what conditions) you get issue that throws fault code.

Title: Re: HELP with my 1.8 t
Post by: Wazzzer on 19 April 2017, 10:46

Test the N75, one pipe you should be able to blow straight through the other should be blocked.

I presume being a 2000 car yours is AGU? If so there's not a great deal that can go wrong on them to cause fault codes, wiring to the N75 is always worth a check

Title: Re: HELP with my 1.8 t
Post by: caddy on 19 April 2017, 11:59

ok will have a look.its really doing my head in :angry:

Title: Re: HELP with my 1.8 t
Post by: Mr_Orange on 19 April 2017, 20:04

As I recall you can also roughly test the dv too; push the inner cylinder in, cover the small vac line attachment with your finger tip and release the cylinder, it should pull a vacuum and slowly retract ;-)

Title: Re: HELP with my 1.8 t
Post by: caddy on 19 April 2017, 21:02

thanks try that and dv all good.one of the pcv crankcase check valve is bad so change that tomos and see it gose

Title: Re: HELP with my 1.8 t
Post by: Jordan_gti on 18 May 2017, 11:06

Don't mean to throw another spanner in the works, but have a good rummage around all of your vacuum pipes, its amazing how many deteriorate with age, I've replaced lots of mine due to this & It seemed to be fine at first glance. Its also amazing how many errors a car can throw with vacuum leaks, its worth a go for the sake of some 3mm Vacuum hose