Hi all, new on here. recently bought a 2003 Hdi 90. Car is driving perfect with good mpg and no smoke that ive noticed.
Couple of weeks ago it failed the NCT (irish mot) on the smoke test, blew 4.4 and under 3 is a pass.
When i started looking into it i noticed that someone has brought a wire from the battery negative to the MAF wiring, I dissconnected the Maf and went for a drive. Drove the very same (fine) and no EML lights or anything strange.
That's an unusual bodge - guess someone was trying to eliminate a MAF fault by ensuring it definitely has a good ground connection.
Did you get it through the test?
Incorrect MAF readings would lead to incorrect fuelling, the most cost effective route in the long run is probably going to be getting it diagnosed properly.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
She is in for the test again on monday, going to try get her as hot as possible before hand ( i also have no faith in the nct testers here, as far as i can see all they care about is getting a retest fee off you) so im hoping maybe a different tester in a different test centre might be enough.
I also done an intake spray egr clean, i have a feeling the egr may be sticking as when you turn the engine off, theres a clicking type noise coming from around the bulkhead. Plan on dissconnecting the egr at some stage anyway although i dont believe its as easy as the older 1.9 Dt engines
Some advice ive been given which im not 100% about is to throw a drop of petrol into the tank for the test and leave the air filter out..... to be honest i would rather try to sort the problem if there is one than mask over it.
I like working on my cars myself and would generally go to a garage for the likes of timing belts/clutches etc. Is there any resonably priced software available for the diy mechanic?
Sorry for all the queries, not up on these Hdis at all. Had a 306Dturbo a few years ago and had an Evo 7 before this, only mentioning as i had Evoscan software and a cable to diagnose faults etc
The diagnostic setup for these cars is Peugeot Planet 2000 - clones avaialbe on eBay for about £75 - search for 'Lexia 3'.
If you're going to have the car for a while, it'll almost certainly save you that, I regard it as an 'insurance policy' against garage costs and potential ineptitude.
If your NCT test is similar to our MOT smoke test, it's not going to do any harm to give it a good hard blast beforehand to dislodge as much soot as possible, so there's not much there to be released when they rev it up during the test.
Pointing out the oil's already hot, so they don't need to let it idle for ages, may help too.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
my old passat used to fail emissions as the mot place is just around the corner so the engine was cold when i got there, but if i took it for a blast to get it warm it always passed no problem, might be worth using some injector cleaner and giving it a thrash
Ive been running Dipetane through her since it failed 2 weeks ago and yea this time im going to try get the car red hot and hope they bring it straight in.
will look into that soon Doggy as i like being able to do things myself and have been looking into retrofitting cruise control also so im guessing ill need it for that also?
Anyone any ideas on the funny MAF wiring and why its not throwing a light with it dissconnected? Or the unusual clicking noise around the bulkhead when you turn the engine off,
Your late model HDi 90 probably has a Siemens ecu, if so you're unlikely to be able to retrofit cruise, others have tried.......
Can only guess on the MAF - maybe someone's lashed up a bodge to trick the ecu into thinking it's reading the MAF when it's not - you really need to be able to monitor the live data to tell.
As you're probably aware, it's not unusual for the engine to run reasonably well with the MAF disconnected, but it's not normal for it not to generate a fault.
The clicking noise around the bulkhead could be the motor driven air recirculation flaps operating, or signs of stripped gearing therein. Another possibility is the vacuum reserve seeping away when the pump stops.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
ok, bummner about the cruise as the most is mostly used for long trips but hey ho what can i do, Do you know where the ecu is located to check for definite?
im going to check the wiring a bit further in a minute, see what i can see then.
As you say i wasnt overlly surprised when the car drove fine, but was suprised that it didnt throw up a fault light.
I'll try get a video or sound recording of the noise today if i get a chance, see if i cant narrow it done, want to do a bit of reading up on dissconnecting the egr completey as they do nothing but bad things from what i can see
thanks for all the help and sorry for the newbie, asked 1000 times questions.
had a quick look there, the red wire from the battery negative is tapped into a White wire in the MAF plug loom, can anyone confirm is this the ground wire for the maf?
Umm, Pug don't actually do colour codes on wires, they do little tiny hard-to-read codes printed on the wires.
The wire you're looking for here is 1336 : Flow sensor earth - although I suspect you might be able to work out which one it is because of the missing wire #4 in the connector.
Doggy wrote:Your late model HDi 90 probably has a Siemens ecu, if so you're unlikely to be able to retrofit cruise, others have tried.......
Is that because the setting isn't there in the ecu?
I was thinking that someone's heard about the modification to give the maf its own earth, rather than use the one in common with the throttle pot
hey Steve, Had a quick look there and yes, its that wire 1336 that is tapped into. Im not sure on what you mean by "the modification" sorry new to all of this.
Bit bummed about the cruise but i guess i never had it so wont miss it
Im registered on servicebox but see that all the documents and diagrams are subscription only now
The parts diagrams are still free from here Unless you mean wiring diagrams, they've always been chargeable.
The modification is just what I said, split the common earth between the maf and tps to prevent spurious faults. Thing is, I've never actually seen any evicdence that it's been done, my car even has a white splodge of paint on the maf so I presume it's been done too, but I can't for the life of me see what has been done
So if im reading this right, there may be no problem with the Maf? someone may have done this as a precaution? thats good news i guess
there is a white line of paint across the maf and connector itself but this extra wire is definitley not a peugeot modification, its too messy to have been done by a proffessional
Well, there may be no problem... What I'm suspecting here is the previous owner couldn't figure the fault, heard about the mod so tried their own version and then gave up and punted the car on to you (almost in time for Christmas too ). I can't imagine anyone doing such a glorious bodge as a precaution. Still, stranger things happen at sea and all that.
How hard does the car get driven? I'd make my first check a damn good rev when stationary, you'll probably get a LOT of smoke. Go for a hard drive for 8-10 miles or so, using all of the revs a few times, and full throttle wherever possible. When you get back, try another hard rev when stationary, I'll bet it's clean as a whistle and will pass the test.
). I can't imagine anyone doing such a glorious bodge as a precaution. Still, stranger things happen at sea and all that.