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Model specific boards => Golf mk4 => Topic started by: mrapoc on 23 February 2012, 12:46

Title: Bocked intake manifold causing overboost?
Post by: mrapoc on 23 February 2012, 12:46

Hey

Just been thinking..I get limp mode when I do WOT for a bit.

This could be because a blocked intake manifold is allowing too much pressure to build up as its not getting pushed straight into the engine.

True? It could also be causing my difficulty in obtaining a decent MPG without driving like a granny?

 :smiley:

Title: Re: Bocked intake manifold causing overboost?
Post by: Big Tone on 23 February 2012, 17:24

Quote from: mrapoc on 23 February 2012, 12:46

Hey

Just been thinking..I get limp mode when I do WOT for a bit.

This could be because a blocked intake manifold is allowing too much pressure to build up as its not getting pushed straight into the engine.

True? It could also be causing my difficulty in obtaining a decent MPG without driving like a granny?

 :smiley:

Blocked intake manifold, seriously doubt that.

Not much help in sorting it I know, codes?

Title: Re: Bocked intake manifold causing overboost?
Post by: mrapoc on 23 February 2012, 20:15

Well..not totally blocked but clogged up

Title: Re: Bocked intake manifold causing overboost?
Post by: scarr89 on 23 February 2012, 20:25

You got a diesel? Whip it off, clean it out and see it helps. If not...then maybe a faulty N75? Mis 'controlling' boost ( I'm guessing here guys :sad:)

Title: Re: Bocked intake manifold causing overboost?
Post by: Steve_PD on 23 February 2012, 20:36

Turbo :lipsrsealed:

Title: Re: Bocked intake manifold causing overboost?
Post by: mrapoc on 23 February 2012, 20:44

Had the turbo cleaned out by rtech end of last year  :shocked:

N75 was replaced about 3 weeks ago  :undecided:

Changed the map sensor too  :angry:

Its the only thing I can think of left to be fair

Title: Re: Bocked intake manifold causing overboost?
Post by: scarr89 on 23 February 2012, 20:45

You got a diesel right? Take the manifold off and inspect. Will take 2-3hours to clean if your competent with a socket set and have a haynes!

Title: Re: Bocked intake manifold causing overboost?
Post by: mrapoc on 23 February 2012, 21:22

yeh.

ill get round to doing it sometime  :smiley:

Title: Re: Bocked intake manifold causing overboost?
Post by: houston on 23 February 2012, 21:32

worth doing anyway, did the intake on my dads passat 130 and couldnt believe the crap build up

Title: Re: Bocked intake manifold causing overboost?
Post by: Big Tone on 23 February 2012, 22:04

If the map sensor sees more boost than requesting then wouldnt this mean that that amount of boost is actually being produced?
As you would have thought the n75 would close the wastegate slightly to prevent this, no?

Is it possible that the actuator is not set up correctly?

Title: Re: Bocked intake manifold causing overboost?
Post by: mrapoc on 24 February 2012, 06:09

Already had the actuator messed about with. Still limpmode on WOT. Gonna take it to retech, only guys who seem to know their stuff tbh...

Title: Re: Bocked intake manifold causing overboost?
Post by: Big Tone on 24 February 2012, 07:33

Let us know the crack!  :grin:

Title: Re: Bocked intake manifold causing overboost?
Post by: mrapoc on 24 February 2012, 10:38

I'll take it round my mates at some point (who has a very handy pit) and we can rip it off one afternoon.

Hopefully might be causing my annoying mpg too! Its very hard and labour some to get decentish mpg.