Aux Heater - Locked Out

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HI,

 

I've been through the Aux heater issues before - back in Nov 2005, and with this excellent forum I managed to replace the glow plug and all was well.......until now.

 

The smoke started to appear again, so I went and bought another glow plug from VW to fix it.

 

Fitting was more of a pain - as all those bolts that were rusty last time were worse this time! - to the extent I had to drill one of them out.

 

Anyway, got the plug replaced and put it all back together - but heater didn't appear to work.

 

I bought one of those interface cables and free vag-com software and it reported a number of error codes (not visible without paying the extra for vag-com) but it did say "lock-out" - so I cleared the codes - unfortunately at that time it was too warm for the heater to have come on.

 

This morning it was cold (!) and the heater started to fire - there was some white smoke (which I assumed was just a burn off of residual crap), the jet engine noise started and then some loud ticking (which is always a good sign) - then it all stopped :-(

 

I heard it fire up again, more jet noise, more ticking - then off, and then nothing - so I'm assuming its locked out again.

 

One thing that was different this time when I replaced the glow plug was that when I pulled out the old one, a tubular gauze looking object came out with it - pretty much stuck on the plug - I don't remember this during the first replacement. I managed to get it off, scrape some crud off it and then I pushed it back into the whole the plug came out of as far as it would seem to go, I then put the plug in but it was a tighter fit than before.

 

Is the plug meant to sit directly in this gauze? anyone come across this?

 

I'm confident I can reset the vag-com fault codes again but I assume it will just go to lock-out again at the moment

 

Any help would be appreciated

 

Graham

 

PS. I've started a new thread for visibility - but please update the main thread.

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Read fault codes last night, am getting "Repeated Flame out"

 

....any ideas based on previous message?

 

cheers

 

Graham

[NikpV]

if it is lighting correctly may be the flame sensor is duff so unit is shutting down to stop diesel pouring out - (it thinks)

[NikpV]

I think the flame sensor is item 2

 

I wonder if the gauze you plulled out/in has fouled the flame sensor :16:

 

 

 

Edited April 9, 2008 by NikpV

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it looks like the glow plug is 2 (on the left hand picture) - is it worth replacing the gauze?

 

Graham

[NikpV]

in the top picture I recon that the glowplug is 3 (looking to the left of the heater part reminds me of the top of the old style plug) and the flame sensor 3

 

 

in the bottom picture I reckon the glowplug is 6 the flame senor 7 and the gauze could be item 10

 

no idea if repalcing the gauze would help, while you have it apart how about replacing the sensor - where to get one from though ??

Edited April 9, 2008 by NikpV

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I'm gonna work on the assumption that the gauze is nackered - have ordered a new one - and the screw for the end cover I had to drill out.

 

I'll check the connections for the flame sensor to see if I've disconnected it somehow.

 

I reckon VW would be able to get me a new flame sensor - they're getting me that gauze !

 

Graham

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Right,

 

dismantled the damn thing again, took out the plug, the flame sensor and then the fuel inlet pipe. The gauze (filter?) as I said preveiously was completely manky! Replaced it with a nice new one, and cleaned out whatever I could in the process will it was apart (stopped short of de-coking it as didn't have the asbestos (!) gaskets).

 

Cleaned the flame sensor, got it all back together....and......hey presto - the thing now fires - but produces masses of smoke :-( - white I believe.

 

...so the next problem isn't the plug (as its new) - am I looking at the metering pump?

 

Few other observations, the exhaust packing looked saturated with diesel, and there has been a smell of diesel around the car for a little bit now, could this be another indication of the pump?

 

What operations can I perform on the pump?

 

Graham

[NikpV]

might be worth shorting the temp sensor and running it for a week and see if the smoke goes away (exhaust packing getting rid of extra diesel from before) - some folks have reported this on here