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Model specific boards => Golf mk4 => Topic started by: CyRuS on 03 October 2012, 00:24

Title: 1.8t agu high rpm problem
Post by: CyRuS on 03 October 2012, 00:24

hello, I own a Golf IV GTI 1.8t AGU, which is giving me problems at high revs. If I go with the gas pedal pushed to 100% when I get over the 5400 rpm, boost pressure is 0.9 bar immediately drops to 0.4 bar. If I stop accelerating a second and I sped up to 100%, the boost pressure rises again to 0.9bar for a few seconds, but then goes back down to 0.4bar.If I accelerated to 80% did not lower  the pressure 0.9bar nothing.

With the vag-com I appear the following faults:

00575 - Intake manifold pressure
16497 - MAF signal too high
16502 - Signal too high temperature
00,561 - bringing the mixture

My car has k03s, 4bar fpr, revo chipping, ic ths, Pipercross admission, spark rs4, new n75, new maf and new temperature sensor

Forgive my bad English but I'm Spanish

Title: Re: 1.8t agu high rpm problem
Post by: Chris. on 03 October 2012, 08:34

http://wiki.ross-tech.com/wiki/index.php/16502/P0118/000280

http://wiki.ross-tech.com/wiki/index.php/16497/P0113/000275
http://wiki.ross-tech.com/wiki/index.php/00561

Id be checking over the pipework for any leaks, especially the small fat vacuum pipe under the middle of the inlet manifold.


Out of interest, what does the car run without the MAF sensor (next to the airbox) run like?

Title: Re: 1.8t agu high rpm problem
Post by: Jin_C on 03 October 2012, 11:48

What you are experiencing is temporary limp mode. With AGUs when the ECU detects unfavourable conditions it will put the engine into limp mode but unlike AUMs etc this can be cleared by taking your foot off the accelerator.

Like Chris said I would be checking vacuum hoses but I experienced this when my cat had disintegrated and blocked up the rest of the exhaust system causing excessive back pressure. Ideally if you can, take the cat off and give it a shake but that can be a pain so you could try just removing the middle and rear silencers and checking if they have bits of cat in them

Title: Re: 1.8t agu high rpm problem
Post by: sam1990 on 03 October 2012, 14:52

i had a very similar problem which turned out to be a leaky recirculation valve, i didnt get the fault codes tho but is something to consider 

Title: Re: 1.8t agu high rpm problem
Post by: CyRuS on 03 October 2012, 22:20

I will look for leaks from the MAF to the intake manifold.

I also proves to drive by disconnecting the maf, then the n75, and see what happens.

To make a log, which channels should I log and what values ​​should appear

I read that this failure can occur at high revs for not having rescaling the maf.

Title: Re: 1.8t agu high rpm problem
Post by: brewey on 04 October 2012, 18:59

I had a similar problem albeit on ARZ and it was a faulty DV too.

Title: Re: 1.8t agu high rpm problem
Post by: CyRuS on 05 October 2012, 23:51

Quote from: brewey on 04 October 2012, 18:59

I had a similar problem albeit on ARZ and it was a faulty DV too.

hello, a failure in the dv is not possible because I have the forge 007P

Tonight I tried to disconnect the maf and then the n75 and in both cases, was marking pressure of 0.3-0.4 bar, from 2000 to 6000 rpm