CEL from Injen intake

M

mooserov

Member
:
07 speed3 gt
I installed my Injen a few months ago and it's thrown a couple of cel's on me. The first one was my fault. While washing the car, i got some water on the filter through the vents in the wheel well, and I found a couple of tiny drops of water on the MAF sensor. But the other 3 were kind of random. Usually after a rain, never while driving, only just after startup. I don't have a scan-tool and I was wondering if anyone else has this prob?
Maybe because it's an oiled filter? Should i buy the Mazdaspeed one with the shield? Can I just get the filter/shield portion anywhere?. any input is appreciated
 
Take it to autozone, they will scan it for free. Then at least you'll have some idea of what you're dealing with.

You can probably just find a dryflow filter that will fit on it, just needs to fit over the pipe correctly.
 
I have the Injen intake and replaced the oiled-air filter with an AEM Dryflow filter (part # 21203DK - approx $50). I have yet to have any CEL problems but we have not had much rain here and I hand wash my car. Hope everything works out for ya.
 
mooserov said:
will the codes still be in the ecu if i've disconnected the battery to clear the light?
Click to expand...

Codes are cleared by completing trip cycles, which involves the CCM. Let me explain:

The ECU sets a code because one of its parameters measures out of range for a specified amount of time. From there, the Check Engine Light goes on to alert you to this. A steady CEL means no alarm, but says "Check me out", and a blinking CEL means "STOP! I'm broken!"

Now, assuming the CEL kicks on steady, the ECU's CCM (Comprehensive Component Monitor) will look for correct parameter ranges, and after a specified amount of time and/or a certain drive cycle, the CEL will turn off if all looks good throughout this.

Example: Say a 2003 Mazda Protege ES 2.0L with a P0102 code. This code is caused by a number of reasons, but is set due to a certain parameter out of range... a Key on or engine running, and the PCM detected the MAF sensor signal was less than 0.36v at any time during the CCM test.
This code sets in 1 Trip(s).

The RESET for this code is a bit more complex, and more specific. Start the car in park or neutral, allowing to idle for 1-2 minutes. Then, bring the car up to crusing speed, avoid WOT, quick accel, and quick decel events for 15 minutes, and at this point the CCM trip is completed. Assuming the component that was throwing the code no longer is "complaining" to the ECU, the CEL will go OFF, after 3 of these cycles. Alternatively, you can go into a scan-tool, and reset, then drive one cycle to verify.
 
it's a p0103 code, so it's maf related. Went away after i scanned it at autozone. i'll order the new aem filter for it. happened again last night in the rain. I think i'll block off the vents in the drivers wheel well and see if that helps. or at least put in some sort of shield
 
P0103 - This is a MAF circuit High input malfunction, not good.

Caused by one of the possible:

MAF sensor ground circuit is open
MAF sensor is shorted to voltage reference or Battery +
MAF is damaged
CPU has failed.

My guess is one of the top two, probably caused by water entry into the maf across its measurement points. A short.

Not good, and absolutely devastating to a MAF. Be careful bud!
 
clos561 said:
................? didnt know the ms cai did boost cut? since its just piping like everything else
Click to expand...

ure right, the ms intake is just piping...and thats the problem. Companies that put some thought into their intake used a smaller diameter for the maf housing. Aka cpe and cobb. The rest all cause spiking and fuel cut due to inaccurate maf reading caused by a larger diameter. IN conclusing the car recieves more air then it thinks its recieving....aka not good.
 
everyone that is over boosting has exhaust upgrades...catless dp and catback exhaust...this is y i think people over boost...not because its ms cai....computer cant keep up with the increased speed of the turbo spool...that is why alot of ms 6 guys are not having this problem because they have tuning solutions
 
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