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Model specific boards => Golf mk4 => Topic started by: wayne_gtiT on 28 August 2009, 16:16

Title: boost problem i think
Post by: wayne_gtiT on 28 August 2009, 16:16
my golf only boosts 5psi untill the engines at 90' (full temp) is this normal?
Title: Re: boost problem i think
Post by: T_J_G on 28 August 2009, 18:07
No it's not normal. sounds like limp mode to me.
Title: Re: boost problem i think
Post by: spetzdude on 28 August 2009, 18:42
you dont realy want to boost anymore then that when your engine is cold  :huh:
Title: Re: boost problem i think
Post by: Steve_PD on 28 August 2009, 18:57
Quote from: T_J_G on 28 August 2009, 18:07
No it's not normal. sounds like limp mode to me.

thats not limp mode
Title: Re: boost problem i think
Post by: mac456 on 28 August 2009, 19:20
as said, you shouldnt be fully boosting anyway until the the engine is at 90.

i always feather my pedal until its upto temp
Title: Re: boost problem i think
Post by: james2 on 28 August 2009, 23:13
my car never hits 90 only in traffic.. i took it on a 10 mile run today and it only just came off cold , and i hammer it around , i am going to do the thermosat and see if that sorts it  :undecided:
Title: Re: boost problem i think
Post by: northeast_gti-t on 28 August 2009, 23:31
Quote from: james2 on 28 August 2009, 23:13
my car never hits 90 only in traffic.. i took it on a 10 mile run today and it only just came off cold , and i hammer it around , i am going to do the thermosat and see if that sorts it  :undecided:
thermostat should sort it  :wink: and then see if you can get it on vag-com
Title: Re: boost problem i think
Post by: james2 on 28 August 2009, 23:34
my car has no fault codes :cool:
Title: Re: boost problem i think
Post by: northeast_gti-t on 28 August 2009, 23:36
nice one  :wink: will be your stat  :wink: should warm up fairley quick ie heater blowing warm air 2-3 miles from cold
Title: Re: boost problem i think
Post by: wayne_gtiT on 29 August 2009, 07:34
i dont thrash my car when its cold but i know theres a problem,any ideas of a solution to this, its definatley in limp mode till 90 temp, want it fixing before it gets worse, not really clued up on golfs so i dont know where to start
Title: Re: boost problem i think
Post by: wayne_gtiT on 31 August 2009, 22:45
talk about hijacking my thread  :sad:

does anyone know what could cause the boost problem, would a faulty maf cause it?
Title: Re: boost problem i think
Post by: topher on 31 August 2009, 22:54
Doubt it's the maf.. could be any number of things. You could go replacing every sensor one by one and still not get anywhere. Could also be a crack in something metal (manifold, turbo etc.) which expands and closes up when its nice and hot.
Did you say you were in Tamworth? You can either pop up to r-tech's workshop (hinckley) in the day or round to my place (dordon) one night in the week and i'll do a quick vagcom scan to see if there are any codes.. might just be something simple!
Title: Re: boost problem i think
Post by: Steve_PD on 31 August 2009, 23:09
Quote from: wayne_gtiT on 29 August 2009, 07:34
i dont thrash my car when its cold but i know theres a problem,any ideas of a solution to this, its definatley in limp mode till 90 temp, want it fixing before it gets worse, not really clued up on golfs so i dont know where to start

If it was limp mode the turbo wouldn't boosting at all, well the diesels dont
Title: Re: boost problem i think
Post by: richw911 on 31 August 2009, 23:28
Quote from: Steve_PD on 31 August 2009, 23:09
Quote from: wayne_gtiT on 29 August 2009, 07:34
i dont thrash my car when its cold but i know theres a problem,any ideas of a solution to this, its definatley in limp mode till 90 temp, want it fixing before it gets worse, not really clued up on golfs so i dont know where to start

If it was limp mode the turbo wouldn't boosting at all, well the diesels dont

Petrol is the same  :smiley:
Title: Re: boost problem i think
Post by: Steve_PD on 31 August 2009, 23:29
so its not limp mode then if he's getting 5psi
Title: Re: boost problem i think
Post by: wayne_gtiT on 31 August 2009, 23:34
yeah topher can pop round anyday thats best for you, im workin 11am to 8pm this week so next week might be better for you, ive just ordered a new stainless exhaust manifold so fingers crossed thats cracked but im pretty sure its electrical, how much are the remaps now?
Title: Re: boost problem i think
Post by: richw911 on 31 August 2009, 23:35
Quote from: Steve_PD on 31 August 2009, 23:29
so its not limp mode then if he's getting 5psi

Wouldn't have said so no

*shouts for toph*  :laugh:
Title: Re: boost problem i think
Post by: topher on 31 August 2009, 23:40
you still get some boost.. dunno if it's as much as 5psi though

pm sent wayne :afro:
Title: Re: boost problem i think
Post by: wayne_gtiT on 31 August 2009, 23:44
i will hold 5psi all the way through the rev band, just went and tried, i waited till bout 70 degrees though, then all of a sudden it changes then will peak at 10psi and hold 7psi, if ought was cracked it would slowly taper off when gap closes, its got me stumped,ive done my own service and havent got it cleared yet would that be the problem?
Title: Re: boost problem i think
Post by: topher on 31 August 2009, 23:57
nope, wouldn't have thought so.

hall sender is a possibility though
Title: Re: boost problem i think
Post by: wayne_gtiT on 01 September 2009, 00:09
whats the hall sender?
Title: Re: boost problem i think
Post by: wayne_gtiT on 01 September 2009, 00:11
i was thinking maybe try the n75 cvalve i would benefit from going for the n75j even if it is not the cause
Title: Re: boost problem i think
Post by: topher on 01 September 2009, 00:13
hall sender is probably the oldskool name for it, vw call it cam shaft position sensor.. top left of the head under the cam cover. don't go throwing money on parts until i've scanned it for you though :wink:

n75f seems to work best, the J is too jerky for my liking
Title: Re: boost problem i think
Post by: wayne_gtiT on 02 September 2009, 20:34
pushed the pipe back on my gauge cause it wasnt on properly  :grin: took my car out this morning and the problems gone, got in it after work and still no problem