I installed a K&N air filter on a stock 2000 Protege LX (1.6L). (Yes I know it's still a slow cage)

There is good and bad. First the good:

- My gas mileage went up to 36.32 on my last tank.
- The change seems to have addednoticeablemore power (I don't know how much since I haven't dyno'd it)

Ok, now the bad:
This may be totally unrelated but it started at the same time, and seems like it has gotten worse. On medium and heavy acceleration, and between 3.5k and 4.5k on the tach, the car jerks a lot in the same way a deisel truck jerks when you take off in first and don't need to. Does anyone have guesses on what is causing this? My thought was that installing the K&N filter messed with the fuel air mixture and the computer/injectors are having issues compensating. At first I thought the injectors might be a little dirty, and I added a bottle of injector cleanerat a fill up, but that hasn't seemed to stop it fromgetting worse.

Any ideas?

 

36.32...give or take a 1/100 of a mile per gallon.

 

I think your on the money with the air/mixture ratio from the filter being attached. I know that the on board chip is supposed to regulate fuel flow, ratio etc. but being non standard!!!. & since its only happened since! I don't think its a coincidence. Is it a specific K&N for that model?. 2nd most probable, check your plugs & leads. I had an Astina (1.8) for a few years, don't need a high powered can when you have a bike.

 

c'mon, I'm detailed. I just divided the miles by the total gas put in the tank. Are you just going to mock me, or do you have suggestions?

 

Thanks for the advice. It is the K&N filter designed for this model. I will check my plugs tomorrow probably. I wonder if there is a way to adjust the sensors to compensate better for the higher airflow. Out of curiosity, would I have to install a jet kit if I put the K&N air filter on my 99 CBR F4 do you think?

 

Sorry man, just bustin' your chops a little. I come in peace.

 

Here you go Travis...
http://www.mazdaforum.com/


Btw, that site looks identical to this one...what's up with that?

 

I'm not terrible familiar with your particular model, but i am going to assume you have a mass are flow sensor behind your filter? Perhaps you over oiled and coated the sensor a bit. Otherwise if you have a ohm meter you can check the injectors easy enough, i could get you resistance specs tomorrow if you needed them, but im thinking 14-18 thru the injector is close. However in my experience, bad injectors are most noticeable at idle or slow acceleration, and get better under heavy load. You seem to have the opposite problem, under load tends to lean me towards electrical problems.