D5 (D5244T to 2005) Injector leak back test results - what does it tell me?

[Yosser]

Today I have done a leak back test on the D5 using a Sealey kit bought from ebay.

This is what the bottles looked like after a few minutes:



I'd be keen to hear how people would interpret these results, as I am very much finding my way with this.

I'm tempted to say that this tells me to suspect numbers 2 and 3 (numbered from the left), but definitely number 3.

How would you interpret this result?

Many thanks.

[Clan]

yes i would agree , . It depends what your problem is , if it has to crank over a while before it fires i would change injector 3 first , it might be that is all you need to do , otherwise change 2 and 3 ...

[Yosser]

The car starts fine, it doesn't need an excessive amount of turning before it fires (in my opinion).

The car runs pretty well in general but is a bit lumpy at low rpm, although this does smooth out higher up in the rev range.

It also smokes a little more than I suspect it should, and is a bit less economical than I imagine it could be.

I have visually inspected the intercooler as comprehensively as I can and have found no evidence of it being split. I will need to replace the AC condenser so at that time I'll find out for sure if the IC is faulty.

The car is a '51 plate V70 D5 with just shy of 230k miles.

[5cilinder]

Leakback differences initself dont tell all of it.
First the injectors need to be leaking LESS than 40 ml a minute
If they are all plenty below that amount then differences are not that bad

Secondly do a cilinder balance test in vida if the corrective amounts are also tiny then there shouldnt be any problem
Only bad injectors need to be overcompensated with extra fuel to retain cilinder balance

Now if there is a injector overcompensating (alot) and is also leaking the most than there is your suspect
BUT rule out bad compression , bad compression also forces to overcompensate to retain cilinder balance

Also pressuretest the intake/intercooler is wise to ruleout or confirm the smokecause

[Yosser]

Originally Posted by 5cilinder

Leakback differences initself dont tell all of it.
First the injectors need to be leaking LESS than 40 ml a minute
If they are all plenty below that amount then differences are not that bad

Thanks, I'll do a timed retest and report back.

Originally Posted by 5cilinder

Secondly do a cilinder balance test in vida if the corrective amounts are also tiny then there shouldnt be any problem

I have been trying to do this without success. Every time I try to run the test I get the message 'operation failed'. I don't know what to try next to make this work.

Originally Posted by 5cilinder

Also pressuretest the intake/intercooler is wise to ruleout or confirm the smokecause

I will try to rig something up to test the intercooler. I have given it a pretty thorough visual inspection and can find no signs of distortion or leaking oil/soot.

[Yosser]

I should also add that when I was having a general look around the injectors etc I found there was what looked like evidence of a minor leak from the union of the fuel rail with the pipes serving injectors 2 and 3.

I tightened up these unions and was able to get 1/8 to 1/4 turn on each nut. The others were absolutely tight. I have cleaned this area to make it easier for me to detect any further leak.

[5cilinder]

A few drops leaking wont do any harm for the railpressure
But to save fuel and prevent dieselsmell its better that it wont leak
The moment you release tension on the fittings they will probably leak when tighten again
Hopefully the extra torque cured the leaking ,but if it keeps leaking you need new pipes, but wait until all injectors are tested ok or replaced because otherwise you need to replace the railpipes again

[5cilinder]

Originally Posted by Yosser

Thanks, I'll do a timed retest and report back.



I have been trying to do this without success. Every time I try to run the test I get the message 'operation failed'. I don't know what to try next to make this work.



.

Make sure your airconditioning is switched off that extra load will mess up the test

[Yosser]

Originally Posted by 5cilinder

Make sure your airconditioning is switched off that extra load will mess up the test

The AC doesn't work due to leaking condenser, but I had it switched off anyway - still no joy

[5cilinder]

Originally Posted by Yosser

The AC doesn't work due to leaking condenser, but I had it switched off anyway - still no joy

Illegal copy of vida?
If yes i had problems too with mine the test came back "ok" but with no results for the cilinders
At the dealers i got the value's for the cilinders