FORUM CLASSIFIEDS DIFFLOCK.com Links & Networks
Forum Homepage
Log in
Profile
Search
Private Messages
Forum Members
Register
Classified Ads
Search Ads
Place New Ad
My ads
Place your classified
ads here for FREE
NB: Adverts placed in the general
forum areas will be deleted
Difflock Homepage
Online Shop
Contact Us
FAQ
Calendar
Garage
Facebook
Twitter
Youtube
Advertise With Us - Reach your target market by advertising on the Difflock.com forum.
Click here or call 0845 125 9407


emisions too high

 
 
Post new topic   Reply to topic    Difflock Forum Index -> Land Rover
View previous topic :: View next topic  
Author Message
4x4menow
Articulating


Joined: 02 Apr 2004
Odometer: 553
Location: stroud



PostPosted: Tue Dec 15, 2009 9:18 pm    Post subject: emisions too high Reply with quote

P38 went for test today and failed on the emisions being too high 2.35 (from memory as i forgot to pickup the printout)
whats the best way to get them down?
Its a 4ltr v8 P reg
got the heater seals changed and thought all was well but the blend motor isnt working on the drivers side bit cold driveing to the test at 7 am Sad
Thanks Nick
Back to top
View user's profile Send private message
excossack
Mud Obsessed


Joined: 06 Mar 2005
Odometer: 2903
Location: Somewhere



PostPosted: Tue Dec 15, 2009 10:18 pm    Post subject: Reply with quote

Service, new filters, injection cleaner and take it for a good run before hand so its nice and warm.
__________________________________
Thanks - John
Back to top
View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
terence
Guest








PostPosted: Wed Dec 16, 2009 12:21 am    Post subject: Reply with quote

check the obvious , like lambda sensor, air mass , run 0.5% methanol in it.

after a good service as others have suggested..
Back to top
Ray_Jnr
Banned!


Joined: 06 Mar 2006
Odometer: 4671
Location: The Northeast


1987 Land Rover 90 TD

PostPosted: Wed Dec 16, 2009 2:36 am    Post subject: Reply with quote

^^^ now thats a comprehensive answer.

come on dennis

__________________________________
Founder of the Difflock Ginger Goatee Club!
Back to top
View user's profile Send private message MSN Messenger
4x4menow
Articulating


Joined: 02 Apr 2004
Odometer: 553
Location: stroud



PostPosted: Wed Dec 16, 2009 6:21 pm    Post subject: Reply with quote

Thanks for the replys
Ive picked up a service kit for it as it needs one because its an insurance write off i dont have any history and dont know when the last one was.
Dennis thanks for your reply was working next to the test centre today and like an idiot forgot to pick up the printout.
will pick it up tomorrow and fit the service kit then i will pick your brains again if thats alright.
Cheers Nick
Back to top
View user's profile Send private message
Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Thu Dec 17, 2009 9:06 am    Post subject: Reply with quote

As already said, you will need to use an OBD scanner to diagnose this one ; when you do it will probably tell you what is wrong.
__________________________________
www.glass-uk.org
Back to top
View user's profile Send private message
4x4menow
Articulating


Joined: 02 Apr 2004
Odometer: 553
Location: stroud



PostPosted: Thu Dec 17, 2009 7:59 pm    Post subject: Reply with quote

Well put the service kit on and took it back was a bit better but not a pass
Left it there for the garage to sort out as i havent got a scanner
when i picked it up all was sorted Cool but i dont know how (or how much £££ Shocked )
as the mechanic wasnt there only the tester will get the bill tomorow
Thanks for the replys and as its a p38 im sure i will have more questions Laughing Laughing
Nick
Back to top
View user's profile Send private message
excossack
Mud Obsessed


Joined: 06 Mar 2005
Odometer: 2903
Location: Somewhere



PostPosted: Fri Dec 18, 2009 8:20 am    Post subject: Reply with quote

What colour are the spark plugs? Black - Overfuelling.
__________________________________
Thanks - John
Back to top
View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
blanche_90
Mud Obsessed


Joined: 23 Nov 2004
Odometer: 2515
Location: recession land



PostPosted: Sun Dec 20, 2009 10:49 am    Post subject: Reply with quote

yep!
go on dennis, bung em up, your post are always a good read.

__________________________________
politicans are like a baby's nappy, they need changing often for the same reason
Back to top
View user's profile Send private message
excossack
Mud Obsessed


Joined: 06 Mar 2005
Odometer: 2903
Location: Somewhere



PostPosted: Mon Dec 21, 2009 4:02 pm    Post subject: Reply with quote

Faulty sensor, split vacuum hose/MAP sensor hose.
Timing a tooth out ?

__________________________________
Thanks - John
Back to top
View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Tue Dec 22, 2009 7:42 am    Post subject: Reply with quote

lindenengineering wrote:
.. with new plugs, wires, filters etc.


Couple of odd-numbered plug leads crossed over?? ("It drives fine" often gets reported even with only six cyls!)

__________________________________
www.glass-uk.org
Back to top
View user's profile Send private message
jamie_grieve
Articulating


Joined: 19 Aug 2009
Odometer: 876
Location: South Scotland



PostPosted: Wed Dec 23, 2009 1:25 am    Post subject: Reply with quote

My knowledge on petrol engines stops somewhere in the mid 80's before just about everything on your post relates to I'm sure. So I'm looking at the numbers and seeing the HC is like twice the legal limit. I dunno if the cat's supposed to deal with this full time. I doubt it. Is the knackered cat a symptom rather than a cause?
I'm totaly guessing here:
Recon head? Tappet clearance so lifter problem or sticky exhaust valve? Rag in the inlet manifold? Timing belt tooth out as above? Can burning oil give those numbers so some kind of stem seal valve guide thing be happening? I Reckon there's a simple mechanical cause rather than some injector overfueling thing going on. I say that just because I reckon a faulty sensor or something outwith its normal paramaters would shout out about it and would probably have been diagnosed to death but something silly might have been overlooked.
Sooooo?
Back to top
View user's profile Send private message Send e-mail
jamie_grieve
Articulating


Joined: 19 Aug 2009
Odometer: 876
Location: South Scotland



PostPosted: Wed Dec 23, 2009 2:26 am    Post subject: Reply with quote

I think I'd need to go back to school if I had a scanner Embarassed
It's nice to see how a pro approaches it and having the right tools and knowledge to use them really makes life better for everyone. From woah to go how long did it take to diagnose the problem?
I'm a little unclear why the mixture is so rich on the one bank and lean on the other. Does it not always try and maintain lambda 1? I can see a restricted exhaust causing less airflow through the engine, no scavenging taking place and being less efficient. I find it hard to believe it drove OK. Maybe a gradual thing was harder to notice? For talking sake if the car had a carburettor how would that change things?
Back to top
View user's profile Send private message Send e-mail
Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Wed Dec 23, 2009 9:58 am    Post subject: Reply with quote

jamie_grieve wrote:
I'm a little unclear why the mixture is so rich on the one bank and lean on the other. Does it not always try and maintain lambda 1?


The bank's fuelling trims are independantly managed.
I find it helpful to remember what the sensors do ; they are indeed Oxygen sensors, not mixture sensors. Can cause complex interactions...

For an ignition misfire (duff lead) for an unrelated example, unburnt mixture enters the exhaust. The sensor detects oxygen, the engine ECU misinterprets that as meaning "lean" and cranks up the fuel trim on that bank. Now we have one cylindering misfiring due to an ignition issue and three cylinders running way too rich, maybe rich enough to have mixture-based misfires. Then we get more oxygen in the exhaust and add even more fuel ...
If cats are fitted they will do their best to eat the unburnt fuel/air and probably be glowing red by now ! All from a wonky spark lead.

Just about anything that causes incomplete combustion - wear'n'tear, potato in the exhaust - can start us on the road to rich running which brings its own distracting symptoms.

__________________________________
www.glass-uk.org
Back to top
View user's profile Send private message
jamie_grieve
Articulating


Joined: 19 Aug 2009
Odometer: 876
Location: South Scotland



PostPosted: Wed Dec 23, 2009 11:10 am    Post subject: Reply with quote

Thanks guys for some really clear answers. makes perfect sense.
Back to top
View user's profile Send private message Send e-mail
4x4menow
Articulating


Joined: 02 Apr 2004
Odometer: 553
Location: stroud



PostPosted: Wed Dec 23, 2009 7:16 pm    Post subject: Reply with quote

Hi dennis
the garage put some cat cleaner through it and with the service it scraped through its test
they said it was only a temporary fix and it needs checking over to see if anything is playing up will get it checked over after christmas or borrow their scanner and give it a try so i may be asking for help
and it only cost me the price of the test which cant be bad
Thanks Nick
Back to top
View user's profile Send private message
Oceantreader
Off-Road Guru


Joined: 12 Aug 2007
Odometer: 1089
Location: 52:09:35 North, 1:30:32 West



PostPosted: Wed Dec 23, 2009 10:17 pm    Post subject: Reply with quote

Dennis,

Not only is that very enlightening to us lay folk, but you explain it very clearly. Thanks mate.


Mike

__________________________________
RRC bobtail.... metal box on wheels into which you pour money.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Difflock Forum Index -> Land Rover All times are GMT - 12 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot post calendar events in this forum
Adrian Flux 2019

Facebook

Oil Safe

Specialist Tools

Evo Oils

Join our mailing list for upcoming events, special offers, discount coupons and expert advice on the latest 4x4 products!

* indicates required





    
Powered by phpBB © phpBB Group