mdad
New Member
Posts: 8 
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Post by mdad on Aug 5, 2014 19:28:59 GMT 1
Hi guys,
Newbie here as I have run out of head to scratch!
Got a 2009 Citroen Grand Picasso 1.6HDi 110 that came in as it has a loud "tappety" noise that increases with RPM
Did the usual thing first and put new injector seals in (two of the injectors had slight leaks, not uncommon), noise still there.
Ran an error code check - no codes as expected.
When doing the diagnostics on the Injector Correction rates it started to get weird.
Injector 1 shows 0.03 mg correction
Injectors 2-4 show between -0.2 mg and +0.2mg at worst, changing with RPM.
Injector 1 though stays static at 0.03mg, no matter what RPM.
So...lateral thinking...I swapped Inj 1 and Inj 4 around to see if the static reading followed...it didn't, it stayed on Inj 1!! Now I used my diagnostic on something else today as well and its nothing to do with a spurious error on it as it showed all 4 correction rates fluctuating as expected.
I have searched the net for anything similar and not found anything. I am going to do a full leak off test tomorrow, but I was kind of hoping that if the injector was at fault then the fault would follow it so I am not sure the injector is faulty - if that makes sense!
There is no loss in economy or performance on this vehicle either. I really don't want to strip the top of the engine down as the owner is skint and I am doing it "mates rates" as it is.
H_E_L_P!!!!!! ANYONE!!! :-D
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Post by Karl on Aug 5, 2014 19:47:51 GMT 1
I'm guessing this is an 16 v dv6 ?
Can you record the noise ? As leaking injector seals give a " chuff " noise
Not a tapping ?
What's the service history like ?
Oil pressure is normally ok
I would monitor oil flow return from turbo
Or remove the sump and check for metallic swarf
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mdad
New Member
Posts: 8
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Post by mdad on Aug 5, 2014 20:12:28 GMT 1
Hi, yes its DV6 engine
I agree on the "chuffing", but as I said, just a matter of course to change a few £ of seals as two were leaking.
Good service history, its only done 42k, oil pressure is good, doesn't smoke (but DPF would mask most of that). DPF is regenerating every 500 miles on average though.
I will check the pipework from the turbo tomorrow but this "clacking" "tappety" sound is more in time with the injectors me thinks.
I was really curious about the correction figures though lol!
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Post by Karl on Aug 5, 2014 22:08:59 GMT 1
Compression test ?
Could be chain rattle ?
Can you shut down a cylinder at a time with your diagnostic equipment and monitor the noise ?
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Deleted
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Post by Deleted on Aug 5, 2014 22:57:13 GMT 1
Hi, yes its DV6 engine I agree on the "chuffing", but as I said, just a matter of course to change a few £ of seals as two were leaking. Good service history, its only done 42k, oil pressure is good, doesn't smoke (but DPF would mask most of that). DPF is regenerating every 500 miles on average though. I will check the pipework from the turbo tomorrow but this "clacking" "tappety" sound is more in time with the injectors me thinks. I was really curious about the correction figures though lol! They dont look very far out to me, positive whole numbers you dont want ! |
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Post by Monkey on Aug 6, 2014 3:09:42 GMT 1
Can't think of DV6 16v valve train design at the mo, but I currently have a 2.0 DW in bits for this reason and have a rocker arm roller bearing or two broken up. Causing a right racket.
Also lack of power but oil quality is nasty so until rockers sorted it may even need a turbo or worse an engine!
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mdad
New Member
Posts: 8
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Post by mdad on Aug 6, 2014 20:05:20 GMT 1
Quick update. I do not believe its the injector(s), they have leak back tested fine, so I have started stripping the top of the engine down. What an ar*e of a job it is too, most of it is under the scuttle on this. The inlet manifold is extremely gunked up one of the ports so much so that I would be hard pushed to fit a pencil down it! My thinking now is that the "tappety" sound is in fact er....a tappet lol! Will take the rest apart tomorrow :-D
The oil looks fine though, no metallic glint, nothing untoward in the intercooler pipes either.
Still bemused by the static correction though - no one it seems has seen this before!
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Post by Karl on Aug 6, 2014 20:11:06 GMT 1
It's more than likely a glitch with your scan tool ?
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Post by Karl on Aug 6, 2014 20:12:36 GMT 1
I know You said service history was "good "
But has this had proper services every year with correct oil
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mdad
New Member
Posts: 8
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Post by mdad on Aug 7, 2014 10:37:36 GMT 1
It's more than likely a glitch with your scan tool ? Yeah, I thought that too, but I have used on other applications before and since and done this check a number of times on it so kind of disregarded that as the issue. Unless the ECU is receiving or giving spurious information. Like I said previously the car is actually running really well - if it were poorly sick I would have been better placed! The car was serviced by a local garage who I know quite well and they are pretty good in fairness to them as I have done mapping work for them on a number of occasions. You can never say never of course |
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Deleted
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Post by Deleted on Aug 7, 2014 16:17:01 GMT 1
I have seen this with no running faults, makes you think ecu is using a fixed figure substitute value ,
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Post by rob on Sept 9, 2014 12:46:53 GMT 1
hi just wondering did you ever get to the bottom of the problem. i have 2011 partner doing samething.
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Post by Karl on Sept 9, 2014 17:50:04 GMT 1
hi just wondering did you ever get to the bottom of the problem. i have 2011 partner doing samething. Start a new thread please As you could have a stage 5 dv6 Which is quite different to the old 16 v dv6 And are unlikely to have the same symptoms |
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