david_hornet27
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| posted on 29/1/15 at 07:29 PM |
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Effing Van!
I never seem to post about my Seven anymore because all my time seems to be taken by my van...
LDV Maxus with VM Motori turbo diesel engine which I bought on the cheap as it wasn't particularly well maintained.
I took it off the road as it was smoking pretty heavily because the turbo was knackered. As I have a spare van it was sat for 18 months while I found
the time to sort it out.
Replaced turbo.
Replaced injectors with reconditioned.
Replaced fuel filter.
Replaced fuel pressure regulator as it had the wrong one fitted?
Cleaned and checked the EGR valve.
The only codes that it showed were injectors open circuit which I have reset and have not reappeared.
I thought this would be enough to sort it out but instead of getting blue smoke because of the knackered turbo, I am now getting white smoke that
smells of diesel.
Just wondered if any more knowledgeable chaps on here could give me an idea of what my next step should be. I feel like driving it off a cliff but it
has no MOT so I can't legally drive it there.
Thanks in advance for any help guys...
'If everything seems under control you're just not going fast enough' - Mario Andretti
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AdrianH
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| posted on 29/1/15 at 07:41 PM |
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Could that be a stuck open injector?
Or try with the original regulator!
Adrian
[Edited on 29-1-15 by AdrianH]
Why do I have to make the tools to finish the job? More time then money.
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Dick
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| posted on 29/1/15 at 07:55 PM |
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If its when warm then can be pump timming, over fuel from injector, or low compresion
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motorcycle_mayhem
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| posted on 29/1/15 at 08:01 PM |
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Common rail... I'm hoping you get a good response here, because I'm going to have to go the common rail route eventually, my old Di
Transit (1996 vintage) is getting a bit tatty. All I see with common rail are high cost injection systems, emission equipment and grief.
I'd have though the same basics apply though.. unburnt diesel fuel sounds like an injection event issue, compression issue or something related
- timing OK? I've had issues where things are on tapers these days, not keyways, things sometimes slip. The pressure sensor signal is both
complex and vital.
Chinese injectors?
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david_hornet27
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| posted on 29/1/15 at 08:32 PM |
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Thanks for replies so far...
Funnily enough my spare van is a 1995 Transit Di. Never goes wrong, just keeps rusting away and being welded.
It was running fine before being laid except for the turbo issue so had so far ruled out timing issues but maybe I need to think along those lines.
Maybe compression is an issue. Injector blow-by? I think I will revisit my work on the injectors and satisfy myself they have all seated correctly
as a next step.
'If everything seems under control you're just not going fast enough' - Mario Andretti
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austin man
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| posted on 29/1/15 at 10:49 PM |
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if it was a vw engine I would suggest injector seals allowing diesel to leak into the cylinder
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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obfripper
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| posted on 29/1/15 at 11:11 PM |
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It's likely you need to get those injectors checked out, the white smoke can be caused by unburnt diesel from a poor injector spray pattern.
This assuming that the engine ran otherwise fine prior to turbo replacement, and nothing has failed/siezed while it has been laid up.
Otherwise, is possible the EGR valve is not closing properly when commanded, to test, make/fit a metal blanking plate for the egr valve-exhaust
manifold pipe, start up and idle for 5 mins to purge the exhaust system, if the smoke clears up, it indicates excessive egr flow, starving the engine
of o2, and causing incomplete combustion.
Has your engine got an inlet shut off(butterfly operated by vacuum or stepper motor), as this sticking partially closed could also make egr flow
higher than it should be(but egr blanking would negate this effect anyway).
I take it that there is no significant oil contamination in the exhaust system from the turbo failing?
I have had that cause white smoke, but only once the engine is hot, and more so when under load than just idling.
Very low fuel rail pressure would cause a non start, and lower than normal pressure when running would cause sluggishness revving up and a lack of
power, but not smoke of any kind, and fault codes as well.
You would hear chuffing if there was any significant injector blow by, slight blow by will not affect the compression enough to cause smoke.
If there was a timing issue, it would not start, and throw a cam/crank sync fault code.
I have had similar experiences with recon injectors from even reputable motor factors, when replaced with new or properly reconditioned items all is
ok.
You may want to find a good local diesel specialist to check out the spray pattern of all 4, if you cannot find someone local, Feather Diesels may be
worth a call.
If you want to diagnose the individual injector first, work through starting up and idling with a single injector disconnected in turn, if 1
particular injector causes no significant change in idle running, that is likely the faulty one.
If it does not affect the level of smoke either, that injector may be stuck partially open.
If your injectors are piezo type, allow 2-3 minutes after ignition off before disconnecting/reconnecting, as they operate on 2-300v so could deliver a
nasty shock.
You may need to clear open circuit fault codes caused by disconnected injectors to start the engine after each injector, as more than 1 open circuit
code may cause a non start.
Have you still got the original injectors, they would make a good swap for testing purposes.
In a pinch, re annealing the copper seals, then planishing them with fine wet&dry will work to test a different injector without blow by.
Dave
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david_hornet27
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| posted on 30/1/15 at 05:30 PM |
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Thanks Dave (obfripper) for such a detailed post. Very much appreciated and gives me something to start with tomorrow. I have the old injectors so
hopefully can find 4 that work out of the 8 if that is indeed the problem.
'If everything seems under control you're just not going fast enough' - Mario Andretti
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