I recently fitted a cone filter to my bravo 1.4tjet 120 , it caused the engine management light to come on, went back off when I went back to the normal filter, has anyone else had this problem or know a cheap solution for this as I can't justify the £200+ for the forge or gsr induction kits

Induction kits - don't bother with them. If you do make sure to notify insurance company and pay the extra premium. If you don't and have an accident the insurance assessor will spot induction kit straight away.
All the kit does is make your car sound slightly different.

It's the sound I'm after and I've asked my insurance , because they make no difference to the performance, safety or value it doesn't make a difference on my policy

An interesing question is if a modified intake will fail the new MOT test. The new rules state:



The intake is part of the emissions contol system (confirmed by a intake leak being a failure) so depending on interpretation by the inspector a modified system could be a fail.
I note that the new MOT manual is no longer at draft.

Robert G8RPI.

It could well be something to do with your air flow meter. Cone filters are typically lined with a thin layer of oil to capture the dirt particles of the passing air. it's not uncommon for the oil on the filter to lightly coat the air sensor as the air passes through it throwing up a light on the dash. This was the case on my Stilo luckily I had an OBD reader and was easily able to turn it of (air mass fault was what the reader said). Now of course it could have been a faulty air mass sensor but, just as in your case it only happen after I fitted the filter. It may sort itself out as the fresh oil on the filter starts to filter more particles of air thus hindering the vapour that comes off.

I love oil type air filters as they are so much better at cleaning air than paper ones plus they only need re-oiling every 50000 miles so you don't need to service them as often. From a performance point of view they are a waste of money. They only compliment other modifications such as modified exhaust, gas flowed heads and bigger turbos. On its own its just a filter that looks good (but one that filters air well) but with modern cars can disrupt sensors. I've stuck with the paper on on mine as they're not that hard to change and are cheap enough.

A new paper filter, filters better than an oiled filter,do a search on the internet, lot's of tests about that to be found.
Oiled filters are designed for large, carburated (V-8) engines, doing dusty dessert races.
They are not intented for small, European engines at all, despite what the manufactures say.
So if you want performance, use quality paper filters, and change theme more often.
If you want noise, and DE-tune your engine, use oiled (cone) filters...
K&N and the like, are the most overrated carparts to be found.
(I do use K&N filters on my carburated motorbikes though....)

The new not rules only apply to cars registered after the 12th September 2017, and thanks gadge, I'll put it back on and see it it sorts itself out after running it for a while

Chris170296 said:

The new not rules only apply to cars registered after the 12th September 2017, and thanks gadge, I'll put it back on and see it it sorts itself out after running it for a while

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Hi,
I don't know were you get 12th Sept 2017 applicability from. There is no 2017 date in the new MOT manual at all. I quoted the diesel requirement, but the spark (petrol/LPG) is similar:

The exception is it only applies to vehicles that need the CAT test. This is any first used after Sept 2002 and many first used after Aug 1995. See chart 2 in section 8 of the manual here:
https://www.gov.uk/government/uploa...lasses-3-4-5-and-7-from-20-may-2018-draft.pdf

Robert G8RPI.

Peter Pick-Up said:

A new paper filter, filters better than an oiled filter,do a search on the internet, lot's of tests about that to be found.
Oiled filters are designed for large, carburated (V-8) engines, doing dusty dessert races.
They are not intented for small, European engines at all, despite what the manufactures say.
So if you want performance, use quality paper filters, and change theme more often.
If you want noise, and DE-tune your engine, use oiled (cone) filters...
K&N and the like, are the most overrated carparts to be found.
(I do use K&N filters on my carburated motorbikes though....)

Click to expand...

I agree that they are overrated and that bigger V8 engines would certainly benefit more with one on but I don’t believe that paper ones will filter better than an oil type.

From my time with a car parts manufacturer, I was able to visit many component manufacturers. A well-made paper filter will use very fine paper, to filter very small particles. Most mesh filters have bigger holes, and rely on the oil catching the smaller particles. Some may get through.

A paper element filter is a carefully folded design, achieving a very large surface area for its size. The car manufacturer will specify a filter capable of flowing far more air than the engine can ever take in, so it will only be a restriction if allowed to become very dirty.

The paper-folding machine is a joy to watch.
It is amazing how many square metres of paper will fit into a small oil filter too.

Paper filters can always be made more efficent at filtering particles. HEPA filters are normally paper and as a minimum will stop 99.9% of particles larger than 0.3um. The only real advantage of oiled filters is that they are re-usable. In very dusty conditions they can be washed and re-oiled rather than replaced. This helps logistics in remote areas.

Robert G8RPI.

I’m a firm believer that the paper element is more than adequate for most engines even tuned ones. And to be fair in most cases they are easy to replace.

gadge said:

I agree that they are overrated and that bigger V8 engines would certainly benefit more with one on but I don’t believe that paper ones will filter better than an oil type.

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I'm an MOT tester, these only apply to euro 6 emission vehicles

I'm not interested n whether it's gonna change the airflow , I've done it on other cars I've owned and if it has made a difference it certainly hasn't been noticeable, I'm only looking to see if anyone has had the same problem as myself

Ok fair enough - I guess we have gone off topic here a bit. I guess I’m the only one here who has had a similar problem so my money is on the air flow meter

I'm gonna put it on and see if as you say the oil clears a little and the light goes back off, this seems reasonable because I put it back to the standard filter and the light went off the next day

GM USA will turn down any warranty claim regarding fuel injection, if an oiled air filter is used...
I own a Pontiac Firebird V-8 with fuel injection, and after using a K&N and having lots of mass airflow sensor problems, I went back to paper filters, and no more problems regarding this sensor.....
It seems that the (tiny) oilmist will affect the (heated) wire in the MAF sensor, and causing all kinds of codes/problems...

Btw, there are special cleaning sprays for a MAF/MAS sensor..

Chris170296 said:

I'm an MOT tester, these only apply to euro 6 emission vehicles

Click to expand...

I'm guesing you quoted the wrong post and ment the one about MOT test applicability. I still can't see any exemption for pre 2017 vehicles.
Can you please point out were in the MOT manual or legislation that says sections 8.2.1.1 and 8.2.21 are only applicable to post 2017 vehicles?

Robert G8RPI.

g8rpi said:

I'm guesing you quoted the wrong post and ment the one about MOT test applicability. I still can't see any exemption for pre 2017 vehicles.
Can you please point out were in the MOT manual or legislation that says sections 8.2.1.1 and 8.2.21 are only applicable to post 2017 vehicles?

Robert G8RPI.

Click to expand...

Who cares but you...?