Hdi 2.0 120Hp Injector Clatter And Diagbox Help

[Aldispatch]

Hi, first post here, hope it's ok.

 

I have a 2009 Citroen Dispatch HDI 2.0 120hp, 135k miles with noisey Injectors, at least that's what i'm thinking at the mo', i bought it recently and found a tiny amount of swarf in the filter, but history shows a recent HP fuel pump rebuild, so i put an inline magnetic filter to catch anything, and the rail pressure seems good, so i assume/hope it's 'historical' swarf, and that could cause injector wear/noise.

 

The engine sounds good at idle, until around 1700rpm ish, but the noise starts at slightly lower revs when warm, it carries on all the way up, and generally only when the throttle is down, a dab of the throttle and the clatter follows the revs then tails off.

 

Listening with a screwdriver in the ear and on the injector pipes, two of them sound significantly more clattery (metallic tapping), and another was also quite loud, so i swapped out two on the right of the engine looking at it from the front bumper, is that injectors 1 + 2 in Diagbox?

 

It sounds pretty much the same after swapping, although i can see in diagbox different % flow corrections, but i don't know what they should be!? If it was 1 + 2  I swapped, then 4 was the other i thought sounded noisey, but has a very different flow correction. Is over 100% good or under 100% for an old injector? Also all four don't add up to 100% average, and 1 vs 4 is quite a high difference, is that normal!?

 

My next plan was to swap out the third noisey injector which i'm assuming was no. 4 at least, it's at the other end to the two I did swap.

 

Before swapping out 2 injectors, at idle:

 

 

After swapping out the two injectors:

 

 

Thanks in advance for any tips or help, as i'm not sure if i could be barking up the wrong tree...

 

 

 

 

 

[Aldispatch]

So a little bit of looking, and i read the injectors are ordered 4 3 2 1 looking from in front of the van. So i have swapped out 1 and 2. Injector 1 now only has 65% flow correction, and it was also the only injector that looked like it had an after market nozzle re-con on it, so i assume it's good? but is the difference from the others a bad thing?  Also that would lead me to think injector 4 which was at 137% correction is a bit blocked? So would be worth swapping out to see the overall affect.. But if the 65% is a bad deviation, should i just swap that one back out!?..

[paul.h]

Welcome to the forum.

 

Sorry I cannot help but maybe coastline taxis could when he is next on the forum.

[Aldispatch]

Thanks Paul, 

 

Listening again this afternoon with a friend, and noting how little difference it's made to the fast tappy sound, I do wonder if i'm over worrying about the noise, maybe it's an HDI thing, as i'm missing the engine cover and under tray wind deflector, which i'm sure would mask it alot, but it does seem excessive, although not having had an HDI before to benchmark, it's really hard to know whats normal. For now i'll wait until someone can advise best what to do with the injectors, as i still have one scrappy spare and two copper washers left to do some swapping.