Down on Power?

D4NPH · Jan 11, 2004

Hello Everyone,

I am looking for some technical assistance. I have a 2000 model Ibiza Tdi s, 90 bhp chipped to 115 bhp. A couple of days ago we had a hell of a lot of rain and my car started to play up, by that i mean the accelerator decided to have a mind of it's own, power was intermitent and i looked like a learner driver with no throttle control! I took the air box out and found it to be a little on the damp side, so i cleaned it all out and took it for another drive, this time the power was not intermitent, but non existent, foot to the floor and a top speed of about 40 mph, the car just didn't want to go atall. So further investigation found that the air inlet pipe had come off the turbo, this was refitted and altough the car is more driveable now, it is still down on power?? It accelerates slowly, it really doesn't want to rev over 3500 rpm, it almost feels like it used to before it was chipped, only worse. If anyone has any ideas i would be greatful as my warranty runs out at the end of the month.

Best Regards,

Dan.

BeezerDiesel · Jan 11, 2004

Ah Dan, where ya bin all this time? Wondered if you still had the TDI - must have about a million miles on by now!

Okay so you've checked all the electrical connections and hoses etc by the sound of it.
Next bet would be to have a look in the scuttle area where the ECU sits and make sure the thing isn't submerged in water if the drain holes have become blocked.
You could also try to disconnect and re-connect the battery which can re-set the ECU incase it's gone into limp mode.
Next thing is to find a member on here near to you that has VAG COM and knows how to use it to see if there are any reported faults as the next guess is going to be the dreaded MAF (Air Flow Meter) which fail regularly in most people's TDIs although I've never had one go in my TDIs.

D4NPH · Jan 11, 2004

Hey there BeezerDiesel,

Good to hear from you, i have had the vag box plugged in and it's picking up no faults. Otherwise, yeah i have checked all other hoses, connections etc. But i will check the ecu, and do the battery thing this afternoon. I am just worried that some water or other crap has been sucked into the turbo whilst the pipe was off and has done some serious internal damage?

D4NPH · Jan 11, 2004

Disconnected the battery and no results i'm afraid, it's still the same. Also checked the ecu, that seems ok too, no water anywhere near it. Took it out again this afternoon and it doesn't seem too bad at low revs but as soon as you get to 3000 rpm it just slows right down.

BeezerDiesel · Jan 11, 2004

OOh 'eck!

There are a few bona fide SEAT technicians on here, so might be worth repeating this thread in the Technical problems forum bit thingy.

Other than that, does the UPsoluted torque still come in with a kick at the same point before the revs die off? Or is it flat all the way?
Still may be the MAF of the N75 Valve if you are still getting some turbo boost but going flat afterwards.

prc · Jan 12, 2004

With all the tubing poping off + water in the airbox, I'd probably say it's a dead MAF, which won't show up as a fault. When the N75 valve is gone you usually get an error logged (don't remember the number, but it'll give the "not enough intake boost pressure").

techie · Jan 12, 2004

I'd agree with the MAF.

They dont often log faults as the ECU doesnt know its faulty as its still giving a reading, just the wrong one.

orangesprout · Jan 12, 2004

could also be that relay that controls the accelerator.

Can't remember number

Sorry

sssstew · Jan 12, 2004

if the N75 or N18 is faulty it doesnt always log a fault.. my N18 didnt and its the same type of valve.

as for the part that orange is on about :-

Pedal position determined by G79
A decisive factor for the injection quantity is the accelerator
pedal position, i.e. the driver input.
The accelerator position sender is a sliding contact potentiometer
and includes an idling switch and a kick-down
switch (refer to Function Diagram). From these signals,
the control unit calculates the necessary fuel quantity
using additional parameters.
Substitute function
If a fault occurs, the engine runs at a higher idling speed
so that the customer can reach the next workshop.
The accelerator position sender is then deactivated.
SSP 153/13

BeezerDiesel · Jan 12, 2004

Got VAG COM have we Stew? I'll know where to come....

sssstew · Jan 12, 2004

not yet.. but should be ordering it by the end of the month, just waiting to see how much money i have left nearer the end of the month

D4NPH · Jan 17, 2004

Good news. The car is sorted!! Turned out to be the airflow meter and they replaced it under warranty! Beautiful!! Thanks for all your help those who replied. :cheers:

BeezerDiesel · Jan 17, 2004

Nice one!
Glad you got it sorted Dan.

sssstew · Jan 19, 2004

woo hoo! kerching! theres another MAF come and gone! typical.

BeezerDiesel · Jan 19, 2004

Was I the only TDI driver that never had a MAF go???
Perhaps it did and the thing was in such a state of tune that I didn't notice!!?

:dunno:

prc · Jan 19, 2004

Originally posted by BeezerDiesel
Was I the only TDI driver that never had a MAF go???
Perhaps it did and the thing was in such a state of tune that I didn't notice!!?

:dunno:

No, the ibiza I had did 247000km+ with the OE one.

bardurh · Apr 2, 2007

Hi Everyone

I had the same problems, and it turned out to be the Airflow Meter! I got an "unoriginal" spare from Bosch, which is the same as the original at half the price :funk:

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Down on Power?

D4NPH

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