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Model specific boards => Golf mk4 => Topic started by: sebby1982 on 13 June 2012, 20:40

Title: Boost problem
Post by: sebby1982 on 13 June 2012, 20:40

Hi guys I have a 1.8t aum the problem I am getting is at about 3000rpm I'm loosing boost. It's intermitant sometimes she fly lovely and boost up good but other times it's like driving a standard 1.8, I have checked for leaks visually and it all seems fine the engine management light also comes on with codes p1602 which was voltage supply terminal low,30 voltage low?? Also code 6100 which I could not work out what that was. I had the codes erased twice but obviously it returned after about 100 miles. I was thinking that maby it's the n75 valve not allowing the actuator open so it could be faulty. If anyone knows of this problem please let me know. The most recent work I had done was my gearbox and clutch. The gearbox was a reconditioned one. Thank you guys

Title: Re: Boost problem
Post by: sebby1982 on 14 June 2012, 11:15

just got fault codes looked at and there was 2 p1128 bank 1 mixture adaption (multi) system too lean, and code 3000 which had no explanation  :angry:

Title: Re: Boost problem
Post by: Dalo Harkin on 14 June 2012, 13:11

Have you tried uplugging the MAF, and seeing if it runs better?

Title: Re: Boost problem
Post by: sebby1982 on 14 June 2012, 20:09

No I have not the boost problem comes and gose than I get the management light every time a different fault code

Title: Re: Boost problem
Post by: rio_gti on 14 June 2012, 20:51

N75 dodgy wire/connection??

Title: Re: Boost problem
Post by: Wazzzer on 14 June 2012, 22:01

my money is on split breather pipes

mixture too lean = air getting in somewhere

Title: Re: Boost problem
Post by: sebby1982 on 14 June 2012, 22:42

I checked all breather pipes they seem ok going to check the decat pipe when I get a chance to put it in the ramp

Title: Re: Boost problem
Post by: dan2252 on 14 June 2012, 23:05

Quote from: Wazzzer on 14 June 2012, 22:01

my money is on split breather pipes

mixture too lean = air getting in somewhere

as this guys said. check for air leaks exhuast blow anything breather pipes. and that voltage fault your on about comes in when you let the battery run flat or take battery off

Title: Re: Boost problem
Post by: sebby1982 on 15 June 2012, 05:46

Thanks for your help guys

Title: Re: Boost problem
Post by: Dalo Harkin on 15 June 2012, 08:53

Id still unplug the MAF and see if it runs better, failing that the pipe after the pancake pipe or on the plate where the N75 and N112 are

Title: Re: Boost problem
Post by: sebby1982 on 18 June 2012, 15:26

If I disconnect the maf sensor will it run worse than it is now? Another thing that came up was bank 1 regulation without was woundering what that was about as well

Title: Re: Boost problem
Post by: Dalo Harkin on 18 June 2012, 15:45

If it is the MAF that is the problem, unplugging will make it better,if you unplug it and its worse then its not the MAF so plug it back in

Title: Re: Boost problem
Post by: sebby1982 on 25 June 2012, 21:50

i disconnected the MAF and it was still boosting sh!t i think i am going to buy the n75 valve on thursday when i get paid

Title: Re: Boost problem
Post by: sebby1982 on 30 June 2012, 20:27

I got a second hand n75 valve and reset the eml and the boost came back and worked well. I than left the car for an hour went to go for a spin and guess what no boost again after 3500 reves. I got a mate to rev my car while I looked under the bonnet and the actuator was not moving at all.