Engine Bucks after installing Injen CAI and SU Test Pipe

[Tyler]

Hey guys,

Just finished installing a brand new Injen CAI (with the "hydro guard") and StreetUnit Test Pipe on my buddy's MS6 (car was bone stock before).

Now when he fires the engine up, it idles just below 1K for a second, but then dips down to about 300, almost stalls then jumps back up to about 1.5K...it will continue to do this until he turns it off.

Additionally, we tried to drive it around the block, and we see some serious bucking around 4K in 1st, 2nd and 3rd gears (didn't get up to 4,5 or 6)...It seems like massive fuel cut at 4K?

I'm home now, but my only thoughts are either the MAF doesn't like its new home for some reason, or we have a vacuum leak somewhere...

Has anyone else had issues like these? Can someone point me to any vac lines I may have accidentally unplugged during the CAI install?


EDIT: Forgot to also mention that the car now has a CEL & the traction control light is steady on...not sure what the CEL is, and the closest place to get it pulled is about a 45 min drive away...

Oh and the windows don't auto-down, but I just found that thread :p

:cheers2:

[jroc]

you have a major boost leak somewhere.

[Tyler]

Any ideas where I might start looking? I'm really unfamiliar with the MS6 engine bay...I'll start looking at the hoses around the intake.

[StealthWyvern]

Any ideas where I might start looking? I'm really unfamiliar with the MS6 engine bay...I'll start looking at the hoses around the intake.


I would start by checking all the couplers on the intake and TMIC.

[Tyler]

I re-checked all of the hoses near the TMIC, BPV and intake...didn't find anything that seemed to be disconnected or loose.

We reinstalled the stock air-box (minus the resonator) and are still getting the boost/fuel cut around 4K rpms...

Is there anyway that the test pipe could be playing a role in this? I wouldn't think that boost creep would be an issue here, but I really don't know much about the MS6 and how it behaves to mods.

[H3LLFiR3]

thats actually really odd. If all the hoses and clamps are on ok then I couldnt tell you what to look for next, there has to be a leak somewhere in order for the car to run like crap. The stock BPV couldnt leak bad enough to where the car would run like that. I'd say take it to the nearest place to get the code run, even if its 45 min away, thats definately something that wont tune itself out. The only real hoses you would have had to mess with pretty much nothing, i cant remember touching any hoses to install my CAI. Pics of the engine bay?

[-STRICK-]

it could be the way the maf mounts to the injen intake. i had a prob with the location of my sensor and had to get a new intake from SU.. I have the injen as well, it was a factory defect,not SUs fault. only difference is my car wouldnt stay running at all.

[jroc]

i have an injen intake on my ms6....no problems..

[Cru$ty Cu$tom$]

I had this same issue with my VW on two different occasions. Im not sure if the two cars are reletively the same in this aspect but the first time it did it the problem was a bad MAF and the engine thought it was getting all this air when it wasnt and then it was like shutting it self down almost. The second time it happened the vacumm line vibrated off the BOV and cause boost leak. I would suggest maybe undoing the sensor for the MAF and see if that fixes anything.

[Tyler]

Thanks for the replies guys.

I thought it might be the MAF re-location, as this happened in my STi too...but we shot that theory down by re-installing the stock intake; same problems.

We actually found a small shop with a scanner locally. My buddy is gonna go by on Wednesday and have them pull the code. I'll let you guys know what we come up with, I'm seriously stumped on this one...but I'm sure it's something simple...

[Tyler]

The shop pulled the code, I don't know exactly what it was (I'll have to ask Chris), but it was related directly to the MAF being damaged.

Apparently the oil from the new Injen filter got all over the MAF sensor and was causing it to read incorrectly. :|

Has anyone else had a problem like this before? It's pretty disappointing and a bit un-nerving knowing that this can happen. Was there any possible way that we could have avoided this?

[boosh2125]

The CEL is definatly from the Test Pipe.. This is because it is catless and that will absolutely throw a CEL... check the bypass valve vacuum lines those could have been knocked off during the intake install..

[-STRICK-]

The shop pulled the code, I don't know exactly what it was (I'll have to ask Chris), but it was related directly to the MAF being damaged.

Apparently the oil from the new Injen filter got all over the MAF sensor and was causing it to read incorrectly. :|

Has anyone else had a problem like this before? It's pretty disappointing and a bit un-nerving knowing that this can happen. Was there any possible way that we could have avoided this?

not really, if it was indeed over oiled ffrom the factory???? The only way would have been noticing an extra greasy filter upon installation.. when you were putting on the hydroshield on, did it feel greasy?? i know its a tight fit, because ive got the same intake.....those sensors are very delicate and break easily.....im not sure how they knew that an oily substance was throwing the codeas well....if it is malfunctioning, it should throw the same code as if it was cracked or chipped or covered in oil IMO.....good luck though, i hope it all works out for you

[zoom zoom maz6]

my guess would be is someone broke it at the shop and told you it was the oiled filter. even if their was oil on it you an use maf cleaner and get it off....... hell the parts cleaners at radioshack come with brushes so you could even sweep the particles away.

[Tyler]

my guess would be is someone broke it at the shop and told you it was the oiled filter. even if their was oil on it you an use maf cleaner and get it off....... hell the parts cleaners at radioshack come with brushes so you could even sweep the particles away.

So what would have caused the CEL, horrible idle and boost cut?

[2NR]

I think the MAF sensor got effed up to begin with because it explains all the issues. Not too sure about the oil thing, especially since it is pretty far from the filter... but stranger things have happened.

[zoom zoom maz6]

So what would have caused the CEL, horrible idle and boost cut?

you may have damaged the maf on install(it happens). or you may have had a vac leak that was rectified once the shop took it apart and redid it.

[zoom zoom maz6]

assuming the guy was 1/2 legit........... you may have broke it. however, shaddy mechanics will fix a vac leak and tell you that the maf was broken because it is more money in their pocket....

[Cullen]

where are you at with this issue?

[cpolly69]

another question i asked myself when i read this was - what is "the hydro guard" - if this is anything like an aem water bypass valve - from what i've come to understand a bypass valve could cause a great deal of problems on a turbo car because the flow across the maf would be all wrong - causing the fuel or boost cut and causing the incorrect af ratio in the exhaust giving the cel - that could be the cause of both problems - if not i have always recommended dry filters because of the oil on the maf - that's why i use the hks

[jroc]

hydro guard is just a water-resistant shield that wraps around the filter, not something like the AEM.

[metro983]

I have a 07 cx-7 im having the same trouble after installing cep cai it ran for on week no problem then one rainy day I make a quick run park.I`m back about 1 hour it wont hold idle and runs rough I towed it to dealer they can`t figure it out they want to switch back to OEM. but i know from they experiance they don`t like it when you modifi ...........any sagestions......thanks

[zoom zoom maz6]

sounds like a vac leak. check your clips and make sure nothing loosened up.

[Navy_Mech2]

did anyone with problems reset their computer? you guys might try that out...just disconnect the battery for 10 min and hook it back up.

[supermex]

I didn't think that the INJEN CAI filter needed oil.
The MAF sensor gets damage easily during removal nad installation .
If it was oil a simple cleaning would off fixed the problem.