Lack of Boost Again!

ItDontGo · Post by **ItDontGo** » 06 Jun 2004, 04:36

Hi,
I asked about this before in a previous post but did not fix it.
My dad's 1997 Xantia 1.9TD with ECU has no boost (or very little). Somebody suggested the enrichment pipe but where is it on the engine. I couldn't find it and if its not there should that fact come as a surprise?[:)]

Dave Burns · Post by **Dave Burns** » 06 Jun 2004, 14:38

It goes from the injection pumps diaphragm housing on top of the pump to the plastic pressure supply ducting from the turbo just a few inches away.
Open the bonnet and it stares you in the face[:D]
Dave

ItDontGo · Post by **ItDontGo** » 06 Jun 2004, 20:18

That pipe is there and it seems very secure.
There is some slight increase in performance when you get to about 3000 revs and there is also a slight increase in noise (as in a whoosh sound) but its not very noisey. Could it be something to do with the wastegate?

ItDontGo · Post by **ItDontGo** » 06 Jun 2004, 21:20

By the way I cant hear any leaks but would you hear them even if it had them?

KevMayer · Post by **KevMayer** » 07 Jun 2004, 03:48

I had this problem some years ago.
It turned out that the wastegate on the turbo was stuck open because it was sooted up.
I had a recon turbo fitted and this restored the performance.
I think this is a common failure mode for a turbo. Mine went at 135 thousand miles.
I used a gauge and measured max boost of 0.2 bar with the faulty turbo. This was at full throttle up a long hill. So, not much boost to make any difference.
The 'new' turbo gave the correct 0.6 bar max (car was an Audi 80 1.6 turboD).

Doc · Post by **Doc** » 07 Jun 2004, 05:53

Had a similar problem myself on my XM 2.1 TD. It seemed breathless over 3000rpm - in fact it wouldn't rev any further. Under 3000 it drove like a dog. It was a combination of sticking wastegate AND a holed hose that links air to air intercooler with enrichment device on Bosch mechanical pump. The holes were allowing pressurised air to escape preventing the enrichment device from supplying extra fuel when accelerating. Repaired hose and sprayed wastegate rod with WD40. Car was great after this.
Doc

zorgman · Post by **zorgman** » 10 Jun 2004, 06:04

where do you connect the gauge upto please for turbo boost as ive got one here doing nothing so i mite as well put it to good use

jeremy · Post by **jeremy** » 10 Jun 2004, 22:51

You connect the boos gauge into the thin pipe linking the intercooler and the pump.
If you need a T piece I would think that windscreen washer parts would do.
jeremy

zorgman · Post by **zorgman** » 14 Jun 2004, 01:55

is that the pipe going to the enrichment unit on top of the bosch pump?

jeremy · Post by **jeremy** » 14 Jun 2004, 12:16

its the only thin one coming from the intercooler
Jeremy