Xantia of Desires - Farewell xantia!

[Guest Hooli]

That pump pictured earlier looks rather similar to the one fitted on Tdi Landies.

 

If so then...

 

The screw on the back you've tweaked does the max power. Undo it for more smoke when floored on boost.

 

The diaphragm under the square cap controls fuelling as it comes on boost. Turn the diaphragm clockwise (upto 180degrees max) for it to fuel up quicker as the boost increases. Hopefully when it was adjusted someone marked it's original position. I'd turn it anti-clockwise a bit & try it. Even when I tweaked my Landy to run 21psi instead of 12psi I'd hardly moved the diaphragm as it just increased the smoke without adding power.

 

The small screw on the top of the cap controls the base fuelling. Most people wind it in a bit to get more grunt from idle.

 

They all work together to adjust how it drives too. If you turn the diaphragm loads but don't increase the max fuelling then you'll find you get to about half throttle & it stops producing more power.

 

So yeah, turn the diaphragm anti-clockwise a bit. That seemed to help the most to cure smoke in my experience (of totally different engines).

 

ETA white smoke sounds like water in the fuel if I remember the colours right. Try draining the filter if it's got a drain plug.

[michael1703]

Ask the mot tester if he'll tweak it for you, he'll probably give up and let it through

[Guest Hooli]

Do it yourself, takes an hour or two driving about to get it how you want.

 

When I did mine I buggered about loads to get less response for small pedal movements & then lots of grunt over half throttle. Made it ideal for offroading so I could creep over stuff carefully & still boot it up the road & chase/overtake V8s.

[Dave_Q]

Just do the opposite of this: https://www.pug306.net/index.php?pageid=boschtuning

 

Max fuel down and screw in the throttle stop for lower max revs as others have said, but it's almost certain that chompy fitted a modified LDA pin for on-boost performance. 

 

Whilst it doesn't make much boost being revved while stationary you probably need to turn the pin to make it less smoky overall.

 

 

PS is the loudness fail a new one? I've got zero chance of ever getting my impreza through another test if a moderately louder than standard exhaust is a fail now.

[beko1987]

Great info chaps, thanks! May have a go at the weekend, will do some reading In the week about it. Lda pin, that's the one, yes I think that's been played with. I'll try and get hold of that diesel magic potion too, sod it it can't hurt!

 

Citrojim from the French car forum invited me round for tea and lexia next year so will take him up on that, he mentioned checking that the fuel pump and equipment were in harmony or something, probably not the main issue I have, but will be nice to see him again.

 

Will see how it goes this week to work and back, and get the exhaust ordered tomorrow morning so it all comes in the week

[scaryoldcortina]

The loudness fail isn't particularly new, it's been around since the 2012 revisions.

 

It's not widely used though, and there is an option for advising it as "louder than standard, but not excessive" which is usually the best route for performance systems.

[Guest Hooli]

My tame MOT tester always tells me not to start my Bonnie when it's there for testing, that way he can't fail it on noise

[beko1987]

Would adjusting the LDA screw help at all? Or should I not seeing as it's modified? I did have another idea, back the throttle cable off a notch or two

[Guest Hooli]

LDA? Not familiar with that

[Lacquer Peel]

Take it to a tester who's less of a fud.

[oldcars]

LDA? Not familiar with that

Less Diesel Attitude

[twosmoke300]

Take it to a tester who's less of a fud.

who will fail it on loads that the first tester missed!

[beko1987]

Yea I'm not taking it elsewhere now, mainly because I get a free retest... Plus hopefully the guy will see all the work I've done and maybe be more lenient when he knows I'm not just a clueless idiot (well I am, but a clueless idiot who has a good support network on this place and the FCF!)

 

I'll fix some advisories too and see if they come off, as he said it would be a full test he does (but for free as he used the 'free retest' to fix his handbrake fuckup), so the brake pipes are fixed and I'll workout what bulb he says is not orange enough and change it. No idea what the oil leak is about, will ask him about that and another advisory is for a wheel bearing (although would that have happened because the suspension wasn't in high? How do I diagnose a dodgy wheel bearing as he would have done?)

 

So a new exhaust and stop it chucking smoke out will hopefully be enough, and I don't mind what I do to stop it chucking smoke out!

 

May look elsewhere for next year though. The Meriva flew through with one advisory though, but it's a more common petrol car. Maybe I need a diesel friendly place? Any Aylesbury shiters know of anywhere?

[The Moog]

Honestly I struggled to get the car through last time with a friendly garage. The straight through exhaust and boost turned up is the challenge, its not really a marginal issue. 

 

I turned the fuel right down and then the idle up but still squeaked through. 

 

The boost shouldnt be a problem as it isnt under load so much when it is tested, i think so I wouldnt play with that. 

 

As Vulg said the fact it has no rust is pretty good, so overall for a 20 year old car it is not a bad fail.  I work on about £200 a year to get a car through, which I reckon this should be. 

[beko1987]

It has rust, but not structural. When he came in and said "it's not good" I was fearing rampant rot, subframe hanging on by 1 bolt etc, was almost relieved when he said what it actually was!

 

Hopefully a new exhaust will help alot of things, then turn the fuel down, pull up around the corner from the mot station and rev the fuck out of it and see what happens! I can't do much else.

 

If it passes though, thats a £120 mot, which won't be so bad, especially since I wanted a new exhaust anyway

[bub2006]

From grin thread, don't know why I posted it there.

I do know he said something about the internals of pump having a land rover pin. I know he also turned fuelling up and did something inside. Turned diaphragm down maybe?? I believe he also did something to the waste gate rod of turbo.

[beko1987]

And that's all why I don't want to go playing with it, it all works very well! Just the damn smoke. Hopefully knocking the fuel down a bit will help, would removing the (quite dirty) air filter achieve anything?

[Lacquer Peel]

Yes, removing the air filter is a good trick for getting smokey diesels through emissions tests.

[Dick Cheeseburger]

Couldn't you find out exactly what fuckery has taken place within the derv pump by asking VLG for CS contact details, since it were he who improved* it?

[bub2006]

I didn't think the exhaust was honestly that bad. You met me in Newquay Terry, did it seem loud? I'm sure I've heard much worse

[beko1987]

Couldn't you find out exactly what fuckery has taken place within the derv pump by asking VLG for CS contact details, since it were he who improved* it?

I could, but I lack the skills and money to buy standard parts to fix it within a week, so need to make the best of what I've got.

 

A damn good thrashing on the way home yielded little smoke, which is promising. Bloody hard to thrash it though when it gets to 70 in 3rd and then I'm up behind someone/in a 30

[Dick Cheeseburger]

I didn't think the exhaust was honestly that bad. You met me in Newquay Terry, did it seem loud? I'm sure I've heard much worse

It wasn't deafening, but definitely noticeably louder than a standard setup. The turbo spooling whistle was much more noticeable too

[beko1987]

It's louder now than when I saw it at shitefest and when I bought it, the welds are failing. When it puffs out smoke at startup a puff of it came from underneath!

[SiC]

Temporarily attach a DPF filter into the exhaust system?

[DodgeRover]

Just bung some forte in it to bring the emisions down it's only a tenner and it does work or chuck in a couple of gallons of lamp parafin ((not for road use obviously) not kerosine)

[vulgalour]

I'm sorry, but you're all wrong.  All he needs to do is put VW badges on it.  Job jobbed.

[Guest Hooli]

From grin thread, don't know why I posted it there.

I do know he said something about the internals of pump having a land rover pin. I know he also turned fuelling up and did something inside. Turned diaphragm down maybe?? I believe he also did something to the waste gate rod of turbo.

 

 

Like I said earlier, remove the cap & turn the diaphragm anti-clockwise a bit.

 

Because of the shape of the pin that'll stop it adding as much fuel as the boost increases & reduce the smoke. That should do it, as I doubt it's getting to full boost with no load so the max fuel screw on the back of the pump won't be doing much.

[MikeKnight]

I helped Chompy take the protective metal shell off the fuel pump to allow for tweaking, which required judicial use of a hammer and cold chisels.

 

So I apologise in advance.

[Richard]

What are the limits nowadays, Google has failed to provide the answer.

[twosmoke300]

3.5 turbo 2.5 naturally ashmatic