The first day I had my intake on I noticed I was using a ton a gas, I am not driving the car hard just normal around the city.

Has anyone had this issue after the air intake upgrade and do you have any ideas as to why my using so much gas (almost twice as much) and for the record I did reset the ECU after the upgrade but that did not work in regards to the gas issue.

ECU reset was battery off for 5 min, then start the car and do not touch the gas for 15 min.

Turn off the car with the key out for 5 sec the restart again with no gas at all and run for 2 min then take it out for city and highway driving and it should have reset it.

I am sure that reset the ECU but I still can't figure out why I am using so much gas? All the connections to the intake are tight and solid and I did not get a check engine light when I first changed it so the sensor must have checked in with the ECU to report all was ok.

Any thoughts.....

 

Air intakes are supposed to help your gas mileage. If you have no codes, then it's pointless to constanly try to reset your ECU. If you do not have any vacuum leaks, you may want to check your IAT sensor, MAP sensor, or Mass Air Flow sensor. The Mass air flow is what tells your computer how much fuel to dump in, and if it's a bit off, then it's pretty much like telling your ECU that you are boost and have more air going into your engine. More air=More Fuel. What year car is it, and what type of intake system you get for it? The MAF sensor is on your intake pipe with I believe 2 wires coming from it. Pull the sensor out and check the resistors on it. Hope it this helps

 

Thanks for your response, I will look into all of the thing's you mentioned I am just at a loss with no codes. It is like the engine is confused with all the extra air and is dumping. I did not have a problem with anything before the install.

Stock 3" k series intake pipe with a k & n filter The car is a 2002 RSX - S with no other mods the rest is stock.

 

Maybe you damaged something on the install?

 

It was a clean install, I think the grommet I used to the mai is not letting the sensor read well. The gromet has a raised edge on the inside and the out so the mai is not sitting in the pipe well. I might change the grommet to allow the sensor to read better. It's the only thing I can think of.

 

what car, motor is this?....sound like your ecu thinks you are running lean so it is dumping fuel, how many miles on the plugs and o2 sensors?

 

Acura RSX-S 2002 Motor is K20A6 I did not have any issues before the intake at all and I have had the sparks and plugs done prior.

I did clear the ECU the first night I noticed the fuel issue and I made sure I followed all the steps.

My concern is that the MAI might not be reading right beacause I took it out and put it in the old stock intake and the sensor is flush with the inside tube and with my new intake and grommet there is a lip inside that holds the grommet tight and the lip on the outside of the tube it raised as well.

So for sure the sensor is not sitting flush on the inside so the air passing over it is not the same as it was stock, I don't think it is reading right.

Like I said I did not have this issue before the intake install and the only thing that has changed is how the MAI sits inside the tube and how the air is passing over it.

Maybe I should modify the grommet so there is no lip on the inside and out so the sensor sits well inside the intake tube.

Thanks for all your advice

 

My bad I am sorry it is the IAT sensor not the MAI sensor.

 

Are you sure I thought it was the IAT sensor that is on the intake tube? Where are the other sensors located that you are talking about (MAP) (MAF) I thought the IAT was on the intake tube? and it was the only one that was removed from the old stock intake and relocated on the new intake.

 

I just found this post so now i'm confused as to what sensor is located in the air intake pipe......

"The ACURA RSX Mass Air Flow sensor is usually installed in the intake air duct between the air filter and the throttle body mounted on the intake manifold. Some mass air flow sensors are mounted directly to the throttle body"

Can someone clear the air here and help me find out what sensor it is?

 

these might help you

http://www.acuraoemparts.com/delray/...All&vinsrch=no

http://www.acuraoemparts.com/delray/...All&vinsrch=no

http://www.acuraoemparts.com/delray/...All&vinsrch=no

 

Thanks for your response but your links are for the stock intake but I have installed a 3" aftermarket intake with a k & n filter. all my fuel issues started after the install.

The sensor is now in tight and snug and still I am running very lean, like 50km to a quarter tank.

I know I will figure this out at some point but the sooner the better, gas is not cheap.

Thanks for all your help

 

what other mods you have?.....is your intake a sri? what state do you live in?

 

i was posting to help you figure out what and where all the sensors are so you know which one your working with

 

Thank you for the links it will help to find out where everything is.

 

I have fixed the grommet issue, it is now sealed and well inside the intake tube but no change on how lean the car is running. All I did was remove the old intake and install the new system I did not disturb any other connections.

It was a clean install so I have no idea what would be the cause of the drastic change in fuel, I would be at 350km at a half tank and I am barley going to get 125km now at a half tank.

I did reset the ECU so that can't be it, the sensor is not damaged and worked prior to the change so maybe the ECU is not changing the way the air and fuel are mixing.

It is like it is dumping fuel to compensate for the air change, I wonder if I should have someone run a deep scan on the ECU.

My check engine light has not come on so all sensors must be reporting back to the ECU with no issues so would a scan or diagnostics on the ECU expose the reason why I am running so lean?

Thanks for all your feedback....

 

so your running the stock rubber intake arm, you just removed the stock airbox, and resonater and installed a k&n filter on the stock rubber intake arm?


if so then its nothing you did, run a scan on your ecu it should tell you what sensors are reading, and if there reading incorrectly or not withing stock specifications

a wire on a sensor could be pulled out a little, messed up, a sensor could have coincidentally failed

 

what octane gas are you using?

 

I took out the old stock system, new 3" intake pipe with a 3" coupler connecting it to the engine block with all the stock hoses and original stock MAI sensor.

The sensor was reading fine before the change, I am waiting to get a diagnostic done to see if the sensor failed after the install.

I have been using 91 octane since day one.

 

get some pics of your engine bay, so i can see where the intake pipe and filter are. if they are still inside the engine bay, they are probably getting a lot of heat soak from the engine bay. even though factory intake systems are restrictive, the car is tuned for them (wether you reset your ecu or not). your best bet for now is to go back to the stock airbox until you can get something like KPRO or a good ecu re-flash, and i would recommend if you want an aftermarket air intake go with a cold-air. if you use a short ram, like it sounds like you have set-up, they give very little/if any gains. as a matter of fact some cars have been shown that they actually decrease power.

hope this was some help man.

 

go back to stock and see if the gas mileage is still as bad

 

^This