Cannot see clearly because of smoke during cold start

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white exec
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Re: Cannot see clearly because of smoke during cold start

Post by white exec » 10 Oct 2018, 10:49

Cold idle of 800-900 I think is a tad slow, as several posts have said.
1000, maybe 1100, sounds better. Wouldn't go higher.

Wonder whether the injectors are in good shape?
How many miles on them, since last serviced (recommended something like every 60k miles)?
Have you hurled in 1:200 of diesel-clean (Wynn's, Miller's or 3CV) for a remedial pump/injector clean-up? Well worth doing.

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CPtje
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Re: Cannot see clearly because of smoke during cold start

Post by CPtje » 10 Oct 2018, 11:28

Guess the injectors have not been cleaned. It has about 80.000km so will try the dieselclean first. Maybe that will help.

Otherwise, is it possible to clean these injectors myself? Never took out an injector but guess there's a first time for everything.

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Re: Cannot see clearly because of smoke during cold start

Post by white exec » 10 Oct 2018, 11:59

Yes, try the dieselclean first. It can be surprisingly good - but try to get hold of one of those mentioned: Wynn's diesel fuel treatment, Miller's Diesel Power Plus, or the 3CV Diesel Treatment. These actually work.

Don't attempt work on injectors yourself. Removing them is not difficult, but you'll need an injector long-socket for this. IIRC it's a 27mm one for the XUD - but check. (If one of your injectors has a small electrical lead sprouting from it - not likely in your case, I think - then the long socket you get will need a clearance slot in its side. Otherwise, not.)

Most diesel specialists (go for a good Bosch Service Centre, if you can) have a fixed price for checking, refurbing and calibrating these injectors.

Get a set of new dished sealing washers at the same time. Refit and bleed off following the instructions in Haynes.

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Re: Cannot see clearly because of smoke during cold start

Post by Simple76 » 10 Oct 2018, 13:31

Injectors would be worthwhile having tested. If timing was out would smoke all the time .

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Re: Cannot see clearly because of smoke during cold start

Post by moizeau » 10 Oct 2018, 15:59

When it's warm if the idle returns to 800, then the stat is set fine. Also there should be a very small amount of free play in the cable when warm.

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Re: Cannot see clearly because of smoke during cold start

Post by moizeau » 11 Oct 2018, 22:40

Jim, I know you're back, please confirm the above, and welcome back

Wookey
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Re: Cannot see clearly because of smoke during cold start

Post by Wookey » 24 Dec 2018, 03:44

This is a fascinating thread. I have the exact same symptoms as Carlo (on a 1994 Xantia engine, mounted in an Expert camper conversion), it's been going on for years, getting slowly worse so, like Carlo, I am now an embarassment when I start and it would be good to improve matters. My van starts very well and always has done (as someone has pointed out, this is true even with one glowplug dead, but you notice as soon as two are gone) but smoky (and increasingly a bit rough and underpowered) for 1st minute or so, longer if just idling. Mine has done about 160,000 miles. In my case that electrovalve is not being energised due to the engine-swap and mismatched harnesses - this is no doubt not helping! Which circuit should it be controlled by?

I'll avoid hijacking the thread (at least for now) but will be going and checking the same set of things. My pump model looks just like the one MikeT posted. Perhaps we can compare notes some more and it may be helpful.
Last edited by Wookey on 24 Dec 2018, 14:07, edited 1 time in total.

Bick
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Re: Cannot see clearly because of smoke during cold start

Post by Bick » 24 Dec 2018, 10:56

You could test them on a battery takes two minutes to do all 4. The oily coating on them suggests they may not be working?

Wookey
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Re: Cannot see clearly because of smoke during cold start

Post by Wookey » 24 Dec 2018, 14:06

In my experience it's normal for the glowplugs to be covered in black carbon but not actually 'oily'. But if he's been doing a lot of cold-start experiments then they might have a bit of extra diesel or oil on them making them temporarily 'oily' rather than just dirty - doesn't indicate a problem IMHO. Anyway, he said he's bought a new set, so this is moot.