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post #1 of 7 (permalink) Old 19-10-2019, 13:46 Thread Starter
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Injector return flow investigation - 2.3 multijet

Hello Guys,
Some time ago I started having white smoke when I give throttle after idling. I went to official service (Garage H. Aerts in Belgium) and after spending 1040 EUR went away with the same problem - they changed throttle valve and checked EGR. Next was to check injector but they didn't really have the equipment and would cost me easily another 1000 EUR - so decided to stop that. The theory is that injector is "pissing" - not closing.

Today I did return flow test. I'm connecting 4 bottles to each injector return hose. After running it for 30-40 min I've this results:
https://www.dropbox.com/s/iahrarg0ap...24416.jpg?dl=0
Third injector seems returned about 100 ml more then the for example the 2-nd.
I'm wondering what to do next based on those results. Shall I take only number 3 or better all of them ?
Anybody had the same problem ?
Best Regards,
Z
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post #2 of 7 (permalink) Old 19-10-2019, 15:02
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I've not researched it but are figures available for the expected results from a prescribed test of the returns?
If they are it will give you a definite answer to your question.

As your problem is white smoke which would suggest excess unburnt diesel, maybe 2 is the culprit, although only 1 and 4 look similar, possibly 3 is the only one working to specification.

Very difficult to make proper informed suggestions as the operation of the injection system is rather complex, not just the mechanical operation of the injectors themselves.

.

John
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post #3 of 7 (permalink) Old 19-10-2019, 15:08
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You are obviously reasonably confident with your DIY, so long as none of them are seized in place, then it is a relatively straightforward job to remove the injectors.
For a price (in France circa €200) a proper injection specialist will test your injectors and for your money will get a proper report with figures to prove the result.

Having said that they are likely to suggest you replace all even if it is only one or two at fault.

.
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John
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post #4 of 7 (permalink) Old 19-10-2019, 15:56 Thread Starter
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Hi John,
Thanks for your input. I was reading here:
https://www.tiepie-automotive.com/en...00-measurement
"When the injector will not close properly, more fuel is used by the hydraulic mechanism, resulting in more return flow"
Initially I thought it it's "pissing" then more fuel fuel passing through it in the cylinder so less return fuel but seems it's not like that.
Removing the injector can be quite tricky I heard and I'm a little bit afraid to attempt. I don't think I have chance for success without special tool.
Do you have experience with that ?

That would save me a lot of money - as the test is only around 30 EUR.
Cheers,
Z
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post #5 of 7 (permalink) Old 19-10-2019, 21:01
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Only changed one set of injectors on a Euro 4 motor and it went extremely well with no problem or difficulty at all, however I believe they can be troublesome to remove if the scuttle has allowed water to drop into the injector areas and caused rusting.

Thanks for the interesting link.

.

John
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post #6 of 7 (permalink) Old 19-10-2019, 23:17 Thread Starter
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Hi John,
They have only a little bit of rust only from humidity and condensation. I don't think water was able to get in.
Do I need special tools or they are used only if an injector is seized ?
Other thing that I don't have is dynamo-metric wrench for the fuel supply pipes.

Cheers,
Z
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post #7 of 7 (permalink) Old 20-10-2019, 09:53
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I think you'll only need extractor tools if seized, the ones I did came out reasonably easily.

Not heard of the type of wrench you refer to, I just used the flare nut type I have in my toolbox, which are basically a ring spanner with a slot cut out of the ring to allow passage over the pipe.

.
Just had a search and found this, https://www.ebay.co.uk/p/Neilsen-Dou...mm/22017010477
Which is the type of tool I referred to.

John

Last edited by eurajohn; 20-10-2019 at 09:55.
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