Strange boost problem...

[Danny_B]

Hi all,

I have a strange intermitant boost fault.

Car drives fine around town but after sitting at 70mph on the m25 for a little while it will only hit 5psi for ages.

It done it yesterday, then the EML came on and as soon as it did the car started fully boosting to 8-10psi (standard).

It must have logged a fault, hence the EML light but what do you guys think could be up?

It's an intermitant fault so can't be a pipe off somewhere.

I'm thinking N75 valve faulty?

Cheers

 

[sparkie1984]

you got vagcom mate? thatll tell you

 

[Danny_B]

Haven't got vag com but i will get it plugged into launch on monday which usually throws up the faults.

Just seing if anyone untill then lol

 

[sparkie1984]

oh right lol!

as you say, maybe overboost so cars cut power to be on the safe side?

 

[PhilW]

Could be anything.

 

[Danny_B]

Plugged her in....

17536 - P1128 Bank 1 sporadic - mixture adaption too lean.

17658 - P1250 Fuel level too low.

I haven't ran the car low on fuel so don't get the 2nd one!

I cleared all codes and drove home.

On the drive home i had no power, think it was in limp mode.

I've disconnected the MAF sensor and it drove 100% straight away.

So it must be the MAF? How much do they cost roughly and will i harm anything driving with it disconnected?

Thanks,

Dan

 

[M87NER]

sure its maf.... thought it would say 'G70 maf signal to low' ect... on vagcom, if so local seat/audi vw garage will have them, or local your local gsf cost 60-70 exchange....

 

[Danny_B]

It started going into limp mode after i done diagnostics.

Im sure it will have logged the maf fault now though.

Is it ok to drive with it disconnected?

 

[M87NER]

not really advise to drive with it disconnected as it just guess's the air/fuel mixture so may run lean ect...leave it plugged in and it will be safe till you get a new one...

 

[Danny_B]

Ok mate will do.

Thanks!