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Discussion Starter #1
Exhaust emission problems - Hjälp!!!

My 1998 4.6 HSE (originally sold in Germany) has failed in the Swedish version of the yearly MOT because of high emission levels. Now I'm not allowed to drive the car. :(
I have had quite a lot of problems with this. First I realised that my Range Rover was getting even more thirsty, both petrol and cooling water. Some times it was even close to overheating. So, at the yearly MOT it had really extreme emissions.
After a lot of checking and testing I realised that the engine had a cylindercrack. :shock:
A complete new crossbolted "short engine" (with all the goodies inside, such as crankshaft, pistons etc) was bought from RPI Engines in England.
The emission levels went down a lot, but not all the way, so therefore I bought 2 new original lambda sonds and 2 new catalysts (not original) as well. :pray:
Now the emissions are allmost down to the right level, but only almost...
In Sweden (suppose it's the same almost all over) we are allowed to have 0,5% CO and it's now 3,5%. Last check had a good level of HC.
I really don't know what else to do now. Exept trying the old and temporary "dirty trick" with carburator/injection cleening fluid, but that useally gives a higher level of HC and the authorities do know this trick and the reason, espescially after having too high CO-levels earlier... Besides I would like to have this problem fixed once and for all.
Anybody out there with experience of this? Helping tips? :doh:
Best regards, Per (Sweden)
 

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2010-2012 Range Rover MkIII / L322
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Re: Exhaust emission problems

Have you had chance to put it on the Diagnostics computer (Testbook)?

This would give you the answer you are looking for.

Sounds like you've changed most things - What condition is the Mass Airflow sensor in? Any air leaks on the intake?
 

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Discussion Starter #3
Re: Exhaust emission problems

The test instruments at the authorised Land Rover garage doesn't show anything wrong now. :doh:
I have tried with an another used mass airflow sensor without any change. Perhaps I should try again?
I will try for air intake leaks. Thanks! :thumb:
 

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Re: Exhaust emission problems

Have you cleaned the MAFs? Just cleaning my MAF cut my emmisions almost in half. Little things like plugs, spark wires, air filter etc all add up when your rig gets sniffed. Another small item would be to have your adaptive values reset AFTER checking all other items.
 

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2010-2012 Range Rover MkIII / L322
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Re: Exhaust emission problems

I'd be looking to make sure the EMS sensors are working ok first. You've replaced most of them!

Any blowing from the exhaust manifolds? Any air leak BEFORE the O2 Lambda sensors?

You should also get the Testbook to reset the EMS so that it can 'learn' to adapt to the new sensor's data.
 

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Discussion Starter #6
Re: Exhaust emission problems

rrtoadhall said:
Have you cleaned the MAFs? Just cleaning my MAF cut my emmisions almost in half. Little things like plugs, spark wires, air filter etc all add up when your rig gets sniffed. Another small item would be to have your adaptive values reset AFTER checking all other items.
My english isn't the very best – MAFs and EMS?
 

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Discussion Starter #7
Re: Exhaust emission problems

Rich998a said:
You should also get the Testbook to reset the EMS so that it can 'learn' to adapt to the new sensor's data.
The Land Rover garage did reset my EDU after that I've changed the lambda sensors.
 

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Re: Exhaust emission problems

pernestad said:
2 new catalysts (not original) as well.
I have read and heard that the cats used in a P38 are extremely good and cutting emmisions down. So good in fact that they hardly let anything through.

What cats did you get and have you tried even second hand originals to see if that has any effect?
 

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Discussion Starter #9
Re: Exhaust emission problems

Ka177ran said:
pernestad said:
2 new catalysts (not original) as well.
I have read and heard that the cats used in a P38 are extremely good and cutting emmisions down. So good in fact that they hardly let anything through.

What cats did you get and have you tried even second hand originals to see if that has any effect?
I bought the cats from a website called http://www.katonnet.com/. The company is located in Germany, but the catalysts came from UK.
After buying a new short engine and new original lambdas, I took these cheaper cats instead of more expensive used ones. The emission levels didn't drop much after changing the cats, wich make me think that the old ones probably were ok....
 

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2010-2012 Range Rover MkIII / L322
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Re: Exhaust emission problems

Sorry -

EMS - Engine Management System
MAF - Mass Air Flow sensor (located along the air intake, just after the air box).

Other than the emission issue, does the car run well? The O2 sensors would be the next place to look but I see these are recent Genuine Part items...

If Testbook can see the live data from the sensors are all satisfactory, then the emissions should be fine.

Maybe Kamran has something there with the cats?
 

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Discussion Starter #11
Re: Exhaust emission problems

With the new Cossworth/Rover 4.6 crossbolted V8 the car runs very smooth and nice, with better performance and lower fuel consumtion. :dance:
Everything is ok, except for the emissions.... :cry:
I will test for intake air leaks and try to clean the MAF. Do you know how that's done?
If this doesn't work, I will try with a new MAF.

And – thanks for all help and good sugestions so far everybody! :thumb:
 

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Re: Exhaust emission problems

As it's a '98, after having the MAF cleaned\swapped make sure to have your adaptive values reset.

If you do go for a replacement - It HAS to be a genuine unit. As these can cost over £700, it might be worth getting a good used unit.

Don't bother with aftermarket ones as they will not be upto the job.

Good Luck and Keep us posted :thumb:
 

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Discussion Starter #14
Re: Exhaust emission problems

I have now ordered a bottle of CRC MAF cleaner spray.
The experiences of users on the different pages you reffered to, was that it is superb and solve a lot of problems.
I will try it as soon as it is delivered!
 

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Discussion Starter #15
Re: Exhaust emission problems

Nope, no correction. :cry:
I disconnected the MAF unit and cleaned it with the CRC spray, mounted it again after drying. I did also check for intake air leaks with help of starter spray wich I sprayed all over while the engine was runnig on idle speed. No change in rpm. Then I whent to the garage to messure for exhaust levels. No change! :twisted:
Finally I took a desperate action (just to try to get the car through the Swedish MOT) and put in some alcohol (E85 fuel) into the gas.
Now both the CO- and HC-levels whent UP! :shock:
I don't know what to do now... :doh:
 

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Re: Exhaust emission problems

After you cleaned the MAF you would need to have the adaptive values reset before your emmisions will be affected.

You may just have made a bad problem worse with the additives.
 

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Discussion Starter #17
Re: Exhaust emission problems

Again I'm a bit uncertain of what you mean, because of my english.
Do you mean that I have to reset the ECU (Engine Control Unit – in my -98 placed behind the battery on the right side of the engine compartement) to get the right levels?
 

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Re: Exhaust emission problems

pernestad said:
Again I'm a bit uncertain of what you mean, because of my english.
Do you mean that I have to reset the ECU (Engine Control Unit – in my -98 placed behind the battery on the right side of the engine compartement) to get the right levels?
Yes, but this cannot be done with a standard OBDII reader, it needs to be connected to a Rovacom or Testbook system and you need to specifically ask for them to reset your adaptive values (short and long term fuel trims).
 

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Discussion Starter #19
Re: Exhaust emission problems

OK, I have now booked a check up with a local "Guru" on Range Rovers in a garage in a nearby city. He is a specialist who RR owners turns to when the authorised garages "looses the battle". I have now managed to get an appointment with him the week after next week. :!: I will point out that he has to reset the adaptive values for short and long time fuel trims, when connected to a Rovacom or Testbook system. Because, now this must be fixed, once and for all! :twisted: As you know I have been struggeling with theese problems since October last year (!!!) and bought new engine, catalysts and lamdas on the way... £££ :crybaby2:
Thanks for your support so far, I'll be back informing you about the result. And perhaps asking about other problems..! :)
Best regards, Per
 

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Re: Exhaust emission problems

A simple thing that can really help (only after having resetted your adaptive values), bring your car really hot.
I mean let it progressively go at normal temp (3 or 4 km) : needle in the middle and then push the RPM, i mean drive it really sporty ten minutes before the test (check all your levels before doing that and always check your engine temp).
This usually help.
One other tip is to remove the filter of the airbox for the test only
 
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