TheWulf

iTrader: (4)

So I was in to get my e-test yesterday (car finally sold, yay) and I did not have the VFAD hooked up -- mainly because the intake I bought was missing the vacuum hoses.

Well, test failed!

P2004 Intake Manifold Runner Control Stuck Open Bank 1
P2016 Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 1

After speaking to my mechanic, a VFAD bypass would very likely result in these codes. Other possible causes from a quick google would be cracked vacuum lines or a problem within the manifold.

What this means for people running intakes without the VFAD, I don't know, but it doesn't sound good! Hopefully these can be masked with a Cobb.


EDIT

wcs

iTrader: (2)

<scratch head>
Wot weird

Thanks Wulf, I need to do mine in April.

Perhaps I'll go early and see what happens.

So those are the codes they pulled from the ECU but you didn't have a Check Engine light on?

Rotary-RX8

iTrader: (1)

So wtf do you do if you have the AEM intake :|

I believe i deleted my VFAD

rickeo

iTrader: (1)

Weird. Can't you just clear the codes with any OBDII scanner then go again? Are they re-appearing right after clearing them?

Unoriginalusername

Same question. Just bought in the fall and didn't have the intake installed, hopefully a flash will be available by the time I need to test again

dannobre

iTrader: (3)

2004 is an APV code...
So is a 2106....

VFAD does not set a CEL as far as I know....otherwise there would be thousands of people running around with the code. There is no poition switch on the VFAD that would tell the ECU what position it is in

You will want to fix that....your car will run like crap at the top end with it stuck closed

It's not a DIY for the fain of heart...the easiest way to free it up is to pull the motor.

You might be able to remove the UIM and dump a bunch of seafoam or ATF in the runners and manually move the valve till it free's up...but you still have to remove a bunch of the top of the engine to get to it.

I had one car that I had to let sit for a week with ATF in it before the damn thing would let me remove the valve barrels from the irons......

wcs

iTrader: (2)

^^^^ MMmmmm Interesting
I didn't bother to check the codes.

Good info Dan, thanks

mafiaboy01

iTrader: (1)

I gotta do my test soon so I'll let you know how it goes. I'm putting everything back to stock except the exhaust muffler.

Really hopping I pass, I have a new cat (1000km), but that doesn't count for much on this new test.

thewird

You can reflash the ECU to disable the code(s).

thewird

dannobre

iTrader: (3)

That makes a ton of sense with an APV code

thewird

I was referring to the VFAD code. The APV obviously needs to be fixed.

Although, after reading through again, I wonder if the VFAD has anything to do with it lol. Sounds like your mechanic doesn't know what he is telling you.

thewird

alnielsen

iTrader: (4)

The VFAD doesn't send back any information to the ecu to cause a code. The only thing that could happen is you could loose vacuum if you didn't plug the hose. But, there is a one way check valve in the line that wouldn't allow that. Unless, you removed the whole line when you installed the intake.
Just put a short piece of vacuum line back on and plug it with a golf tee.

Unoriginalusername

The MS CAI/AEM was sold as a street legal intake, so if the setup actually does record an error that prevents passing the test I would think Mazda would need to issue a flash to correct

Carbon Fibr

cob accessport -> eliminate code --> no code = pass.
e-test is now EZ.

(from what ive been told.)

Unoriginalusername

must be nice being an S1

Carbon Fibr

wanna trade?

Unoriginalusername

2whp and no CEL's isn't thaaaaaaaaat important to me

TheWulf

iTrader: (4)

Correct.

Yes, however you need to go through a "Drive Cycle" before your car is "ready" to be restested, and that's when they re-appear.

Don't I know it.

Pretty much that

Mazda_RX804

I have to get my etest done in the spring, anyone with a AEM CAI, do the test with no issues? Kinda worried now.

Mazda_RX804

Here is an example of the etest, this was done on my daily. Not to sure if it helps you out "WCS" on what they look for.

RXeckless

iTrader: (5)

Me, no issues or maybe the dealer just passed it?

TheWulf

iTrader: (4)

Best advice I can give you is get a good code scanner.

I am using a Innova 3100f, works very well. MIL on (even when CEL is off) = fail.

It also tells you which systems are "ready". Any system not ready = fail.

Once all your systems are ready, the light on the unit goes green. Then you go for e-test.

I borrowed this one from a friend, but now I'm going to buy one.

Mazda_RX804

Under new 2013 etest?

Mazda_RX804

Just thinking...I'm not that worried. I have no CEL, if that were the case everyone would be failing there etest, lots of other owner not just rx8 have aftermarket intakes, and are passing.

dannobre

iTrader: (3)

Quit worrying about the VFAD..it doesn't throw codes...or cause problems

The whole thread started before the OP looked up the cause of the codes he had...APV...not VFAD