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Post by Rhubarb on Aug 18, 2015 20:12:13 GMT 1
Hi all, as per title..16valve DV4, year 2002. Just had this in for mot, service and no power.. I suspected the Maf from the outset and live data confirmed it.. The EML has not been on but has these codes as follows: Flowmeter signal short circuit to earth or open circuit Vehicle speed signal received by CAN incorrect Turbo pressure signal short circuit to positive, open circuit or pressure too high.. Well the turbo pressure was far too low, but since fitting the new maf it is back to normal. But since before and not a lot better afterwards there is no power low down, you hit 3000rpm and it takes off. I also scoped the maf before condemning it, the waveform was very odd.. I've also been right through the vacuum pipes and boost solonoid, and egr solonoid...Vacuum present, although there doesn't seem to be any at the wastegate actuator.. Now my feeling now has it got a variable vane turbo, wondering if the vanes are seized in one position. As I say, it has improved a fair bit, and is driveable now! Any ideas before I go bald?!  |
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Post by Karl on Aug 18, 2015 22:00:51 GMT 1
I can't say for a Citroen
But a ford of a similar vintage would have a fixed geometry turbo
And sounds like you may have cured it
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Post by Rhubarb on Aug 18, 2015 22:50:34 GMT 1
I can't say for a Citroen But a ford of a similar vintage would have a fixed geometry turbo And sounds like you may have cured it Thanks mate..I can't imagine it having a VVT, cos it's the low output one.. It certainly has improved on what it was..I've never driven another derv one of these so I can't compare...Spoke to someone today and he said his wife used to own one and it was the same as this one to drive. |
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Post by Karl on Aug 18, 2015 23:06:53 GMT 1
Don't forget it's age !
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Post by Rhubarb on Aug 18, 2015 23:14:37 GMT 1
yep true, plus it's done 112thou  |
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Post by Noberator on Aug 18, 2015 23:24:32 GMT 1
yep true, plus it's done 112thou £40 a ton atm. Unless it's moved since I last checked?  |
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Stilo
Apprentice
Posts: 1,536
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Post by Stilo on Aug 18, 2015 23:45:15 GMT 1
Those 16v DV4's are a bit rare, no? I thought the standard DV4 was an just an 8V. I suppose some numbers from turbo will confirm if it's a fixed or variable.
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Post by valhalla on Aug 18, 2015 23:50:51 GMT 1
Rhubarb,
Not sure if this one has got the intake throttle set-up in parallel to the EGR valve, but your symptoms point straight at an emissions-system fault if the car goes to 3000rpm (more or less exactly) then takes-off as it should.
The problem here is that PSA were blind-drunk when they put the emissions controls together for these engines, so their first reaction to get more EGR was to bung a fr****g intake throttle flap on the entry to the manifold. The MAF controls initially bring in the EGR, but later on as the airflow needs reducing further, the intake throttle starts to close. If for some reason you have a car that has a high MAF, or a sticky EGR valve, then the throttle will close during normal driving.
My advice is to check for an intake throttle, and if there is one, either blank the vacuum port to it, or remove the flap from the shaft. Leave the EGR valve if you want to keep your green credentials, as this is not directly causing the problem. The intake throttle is only there to really drive the last few percent on the EGR rate, by which time even a new engine is going to be gasping for its life. It's a rubbish idea, by rubbish French people!
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Stilo
Apprentice
Posts: 1,536
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Post by Stilo on Aug 18, 2015 23:52:48 GMT 1
Found this on Wiki
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Post by Rhubarb on Aug 19, 2015 18:38:14 GMT 1
Rhubarb, Not sure if this one has got the intake throttle set-up in parallel to the EGR valve, but your symptoms point straight at an emissions-system fault if the car goes to 3000rpm (more or less exactly) then takes-off as it should. The problem here is that PSA were blind-drunk when they put the emissions controls together for these engines, so their first reaction to get more EGR was to bung a fr****g intake throttle flap on the entry to the manifold. The MAF controls initially bring in the EGR, but later on as the airflow needs reducing further, the intake throttle starts to close. If for some reason you have a car that has a high MAF, or a sticky EGR valve, then the throttle will close during normal driving. My advice is to check for an intake throttle, and if there is one, either blank the vacuum port to it, or remove the flap from the shaft. Leave the EGR valve if you want to keep your green credentials, as this is not directly causing the problem. The intake throttle is only there to really drive the last few percent on the EGR rate, by which time even a new engine is going to be gasping for its life. It's a rubbish idea, by rubbish French people! Thanks for that, I double checked this morning, it doesn't have a throttle flap |
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Post by Rhubarb on Aug 19, 2015 18:39:34 GMT 1
Got to be the the VVT..Going to speak to the owner to see if he'll let me strip the turbo down to investigate |
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Deleted
Deleted Member
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Post by Deleted on Aug 21, 2015 22:25:43 GMT 1
Any luck with this rhub ,i would have said maf signal from the drive description, the signal should be a frequency type although this is a 1.4 16 v hdi so might be something different |
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Deleted
Deleted Member
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Post by Deleted on Aug 22, 2015 19:38:11 GMT 1
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Post by Rhubarb on Aug 26, 2015 18:27:24 GMT 1
Any luck with this rhub ,i would have said maf signal from the drive description, the signal should be a frequency type although this is a 1.4 16 v hdi so might be something different I have replaced the Maf and it's made a little difference, but it's coming back for some of that magic stuff to be slung through it to try and clean the vanes. I have found re-con replacement cartridges on ebay for £75! |
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