Discussion
Have you got a K&N on the car? As the thin Oil from the Filter mesh is prone to Gunking up the MAF. Try giving the element a clean and try again. Also did you gap the Plugs correctly. I know many people think this is an ancient practise but it's well worth it as the fuel could be blowing the Spark out.
yea ive got a k/n fillter but ive changed it and still no success,also i put the old plugs back in and that didnt cure it neither.ive just had a dignostic done and nothing was found to be wrong so iam changing the petrol pump this weakend see if that does anything cause its driving me nuts.
If you have the original OEM air filter/airbox assembly stick it all back on. Having a K&N means you will need a remap to get it to run with the K&N properly. MAF sensors on those are very delicate and it wouldn't surprise me if it's reading very low. Doesn't have to show a check engine light for it to be malfunctioning.
Without plugging a laptop in and logging mass air flow, AFR's, Timing etc...or even being there to see what happening it's a bit like p1ss1ng in the wind.
Without plugging a laptop in and logging mass air flow, AFR's, Timing etc...or even being there to see what happening it's a bit like p1ss1ng in the wind.
Just because you feel the car is running properly it doesn't actually mean it is. These K&N filters that sit under the bonnet in the engine bay are prone to reducing performance becuase all they are doing is sucking hot air in from under the bonnet unless you have a louvre on the bonnet above the filter or can direct cold airflow with some ducting directly to it. If you lift your bonnet after you've been for a run you'll know just how hot it can get under there.
Also they tend to lean out the Air/fuel mixtures by a considerable amount and like any other scoob the MAF scaling on your ECU will need recalibrating to represent correct airflow. This always has to be done with non standard aftermarket induction kits. Same thing again with recalibrating airflow for a cold air intake. I'm not saying they are no good but unless you're making huge power you're better off sticking with the standard airbox and a high flow flat panel air filter. With some modification the OEM airbox will allow reasonably unrestricted airflow and keep underbonnet temps out.
As someone has already said perhaps you should check spark plug gaps, they should be between 0.7mm-0.8mm. That will affect running bigtime if they aren't right. Subaru's are very sensitive to any changes whether it be ambient temps or bad fuel, too large or too small plug gaps, dirty air filter, etc etc... NGK platinum plugs are very good.
Try cleaning out the K&N filter, you should be able to find some air filter cleaner and oiler to service that. Have you cleaned out or replaced the fuel filter?? Make sure you haven't got any inlet or boost air leaks.
Again as far as the MAF sensor is concerend there's nothing you can do to check that other than plug your car into a laptop and do some logging or if you have a mate with the same car swap their sensor onto yours to see if that changes anything, and of course an ECU reset is easy enough for you to do. Just leave the battery off overnight and try again in the morning just to make sure it resets. It doesn't take too long for it to re-learn and adjust normal running calibrations and you'll soon find out if that makes any difference.
If you're still stuck after that you need to see a Scooby specialist. Despite some very well known specialists with high profiles, and certainly since i've been remapping scoobs i've soon learned which ones truly are specialists with a deserved reputation and worth every penny they charge, and who the cowboys are that do a truly lousy and lazy job and still get away with charging customers the earth!!
You're in Suffolk, go see Zen Performance. They're not too far away from you, they're in Wellingborough, Northants. I would recommend Paul Blamire and the crew all day long and they have a decent rolling road.
HTH
Also they tend to lean out the Air/fuel mixtures by a considerable amount and like any other scoob the MAF scaling on your ECU will need recalibrating to represent correct airflow. This always has to be done with non standard aftermarket induction kits. Same thing again with recalibrating airflow for a cold air intake. I'm not saying they are no good but unless you're making huge power you're better off sticking with the standard airbox and a high flow flat panel air filter. With some modification the OEM airbox will allow reasonably unrestricted airflow and keep underbonnet temps out.
As someone has already said perhaps you should check spark plug gaps, they should be between 0.7mm-0.8mm. That will affect running bigtime if they aren't right. Subaru's are very sensitive to any changes whether it be ambient temps or bad fuel, too large or too small plug gaps, dirty air filter, etc etc... NGK platinum plugs are very good.
Try cleaning out the K&N filter, you should be able to find some air filter cleaner and oiler to service that. Have you cleaned out or replaced the fuel filter?? Make sure you haven't got any inlet or boost air leaks.
Again as far as the MAF sensor is concerend there's nothing you can do to check that other than plug your car into a laptop and do some logging or if you have a mate with the same car swap their sensor onto yours to see if that changes anything, and of course an ECU reset is easy enough for you to do. Just leave the battery off overnight and try again in the morning just to make sure it resets. It doesn't take too long for it to re-learn and adjust normal running calibrations and you'll soon find out if that makes any difference.
If you're still stuck after that you need to see a Scooby specialist. Despite some very well known specialists with high profiles, and certainly since i've been remapping scoobs i've soon learned which ones truly are specialists with a deserved reputation and worth every penny they charge, and who the cowboys are that do a truly lousy and lazy job and still get away with charging customers the earth!!
You're in Suffolk, go see Zen Performance. They're not too far away from you, they're in Wellingborough, Northants. I would recommend Paul Blamire and the crew all day long and they have a decent rolling road.
HTH
i think a re map is in order cause ive a replaced the k&n and petrol filters and the k&n filter sits right behind an air duct, i aiways use platinum plugs mind u i didnt check the gaps cause ive never had any trouble before.ive checked for air leaks and i couldnt find any no were. i think its time for the plugs out and check the gaps and disconect the battery. cheers mate uve been a great help
big smiles all round finally got 2 the bottom of the problem it was a dodgey coil pack,my mate told me to try my old ones again and hey presto back 2 full throttel again.a quick check for any faults and got the all clear yesterday,happy days are back.i would like say big thanks to every one for there help.cheers
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