turbo and smoke issue yet again

[20vcqdriver]

Originally Posted by Woodsman

20vcqdriver
Did you manage to drive the car with vagcom connected?
Does the live data page show knock signal? or ignition advance values?

IMHO you should be looking towards the Injectors, I just saw you mentioned old fuel in a previous thread,totally different system I know but this wreaked havoc inside my fuel distributor

If an injector was partially clogged, it would not show a fault code unless the injector was electrically faulty and would cause a lean mix and detonation, the ecu tries to counteract this by reducing advance and boost, if it can't it goes into limp mode.

would expect to see a knock control fault logged though

suppose they could be tested on the rail, but I didn't recomend that
Professional cleaning and testing is safer.

The codes were cleared with the engine running, went for a drive until limp mode came in and kept it running whilst VAGCOM plugged back in with no codes showing. Then read the live data page where everything was text book. The old fuel was only 5 months old when I started up the car again and have kind of eliminated this as all the spark plugs on removal are all the same colour. Plus the amount of fuel getting pushed in with the re-chipped ECU and V-power fuel should of cleaned the nozzles by now. In the process of re-instating the breather system to see if this has an effect. N80 valve re-connected. Let you know what happens....

[20vcqdriver]

Well thats not fixed it. N80 and breather reinserted via catch tank. So have to wait for boost leak test next week.
Managed to stay out of limp mode long enough tonight to show a couple of chavs in a peugeot GTi what acceleration in 1st and 2nd is like with 4wd. He sat revving his engine at the lights and left tyres squealing and suddenly found this old Audi 1/2 car length ahead by the time he was out of 1st gear, despite me giving him 1/2 car length head start, into second and leaving him pretty quick now then.....limp mode cut in, but by then I'd proved the point...
Can anyone list all the causes for the car going into limp mode without a code please and can then start working my way through them all.
Sure the slow spool up has something to do with it too.
On a good note, re-instating the breather system has stopped the smoking exhaust...

[Gaz]

20vcq.. I take it you have fitted some new/up rated parts since it last ran right. ? this correct?

If it were me i would put everything you can, back to how it was when it was running OK.

Then go from there. Did you say you fitted a new inter cooler? Also, Did you modify it in someway? Even if this is unlikely the cause, i'd still swap back to the stuff you had on when it was running properly, and see if the problem gos away.


I'm no expert, I don't even know very much tbh, but its what I would do in your situation. Unless of coarse you've done this already?

And don't give up! I want to see this thing running god damn it! lol

[20vcqdriver]

Originally Posted by Gaz

20vcq.. I take it you have fitted some new/up rated parts since it last ran right. ? this correct?

If it were me i would put everything you can, back to how it was when it was running OK.

Then go from there. Did you say you fitted a new inter cooler? Also, Did you modify it in someway? Even if this is unlikely the cause, i'd still swap back to the stuff you had on when it was running properly, and see if the problem gos away.


I'm no expert, I don't even know very much tbh, but its what I would do in your situation. Unless of coarse you've done this already?

And don't give up! I want to see this thing running god damn it! lol

Thats not possible! Major change to fit the chargecooler and to be honest thinking back it wasn't 100% last year, a milder version of what it does now though it would tend to not stay in limp mode but automatically recover and only now see the connection.
And you don't want to see this thing running right as much as I do.
Was surprised this 180bhp Peugrot almost stayed with me earlier up the road when I remained in 4th from 50 to 70. Especially as the old girl will cover it in under 3.5 secs. Must have been playing with it... but not enough
Hoping boost leak test will find something on Tuesday..If not I am going to have to put on my best fault finding hat... Anyone who knows what causes a no code and 'limp' mode would help to avoid chasing red herrings...

[kerker21]

if its not showing faults are you shure its actualy in limp mode ????

[20vcqdriver]

Originally Posted by kerker21

if its not showing faults are you shure its actualy in limp mode ????

Yes, boost drops from 1.3/1.4 bar normally to a max of 0.4/0.5bar until you switch off the ignition and restart the car. Then all is fine until the next time you exceed 4500rpm on WOT. And then there is the slow spool up before the power kicks in... hit WOT and count 1 and 2 and whoosh. Very annoying .

[kerker21]

waste gate not jaming open ???

[Gaz]

what was it u acctually did to the inter cooler? I seem to remember some extra pipes or something. ???

[Martc]

Originally Posted by 20vcqdriver

Yes, boost drops from 1.3/1.4 bar normally to a max of 0.4/0.5bar until you switch off the ignition and restart the car. Then all is fine until the next time you exceed 4500rpm on WOT. And then there is the slow spool up before the power kicks in... hit WOT and count 1 and 2 and whoosh. Very annoying .

Sounds like the air mass meter?

[Gaz]

Originally Posted by Martc

Sounds like the air mass meter?

hey! now i know its not a ford, but I know these things (MAF) are notorious for dieing on escorts. usually from oil.

They say the oil on these oiled K&Ns is no good for em! (the MAF's that is)

seen massive impact on power when they die, and a big jump in power when they are replaced with a known good item

Perhaps simply 'un-plugging' the MAF on a turbo car is no good for fault finding, as it's dealing with a lot of air.

Have u tried another MAF. ? new or known good one?

infact! is your MAF capable of measuring the correct air? Maybe it don't like your lower temps/ denser air from your charge cooler. Or perhaps its just a dud?