- :
- '02 Mazda Protege5
So I'm not posting about a problem per se but rather out of general curiosity.
I installed a short ram intake (from eBay) and an HKS hi-power muffler for my P5. I like the sound it makes, not sure if there's a noticeable power increase but they say maybe a 5-10HP increase total. so not much. I bought it to make it sound and look better anyway.
I noticed on my scan tool my Fuel trims are elevated now. STFT is mostly in the single digits but will spike to double digits and the LTFT is consistently in low teens after resetting ECU from the scan tool. I saw a reading of 18% briefly too. This was while driving at various speeds/RPMs/Loads. There is no CEL however. prior to changing the intake the fuel trims were less than +/- 7% all around. So is that normal for an aftermarket intake? Will driving around for a few days will the ECU "learn" the new intake? or maybe I have a vacuum leak somewhere although I doubt it because i made sure the intake was on tight.
I'm kind of new to fuel trims but it makes sense that a better intake system= more air being drawn into the engine = more fuel has to be added to compensate which adds the 5 or so horsepower, but the ECU is factory tuned to the stock intake so the O2 sensors have to pick up on the changes.
I installed a short ram intake (from eBay) and an HKS hi-power muffler for my P5. I like the sound it makes, not sure if there's a noticeable power increase but they say maybe a 5-10HP increase total. so not much. I bought it to make it sound and look better anyway.
I noticed on my scan tool my Fuel trims are elevated now. STFT is mostly in the single digits but will spike to double digits and the LTFT is consistently in low teens after resetting ECU from the scan tool. I saw a reading of 18% briefly too. This was while driving at various speeds/RPMs/Loads. There is no CEL however. prior to changing the intake the fuel trims were less than +/- 7% all around. So is that normal for an aftermarket intake? Will driving around for a few days will the ECU "learn" the new intake? or maybe I have a vacuum leak somewhere although I doubt it because i made sure the intake was on tight.
I'm kind of new to fuel trims but it makes sense that a better intake system= more air being drawn into the engine = more fuel has to be added to compensate which adds the 5 or so horsepower, but the ECU is factory tuned to the stock intake so the O2 sensors have to pick up on the changes.