C63BLUE

So my car is throwing a P0171 code every 10-50 miles and seems to have a slight stumble at idle (I'll get to stoplight, it'll stumble/vibrate for a few seconds then go away -- RPM holds constant the whole time).

Car does have ROW air boxes with charcoals removed and AFE dry filters. My question is if the intake is what's causing the lean code, would layering on a stock filter do the trick? I don't have the old charcoals so would it make sense that the new dry filter would act like charcoal, and then a paper filter on top would make it like stock?

What are your thoughts?

Mort

I am not sure if that will solve your problem but I don't think it will be possible to get a second filter in the filter box anyway.

jmueller

Agreed. The standard air filters are about twice as thick as the charcoals so I doubt they would fit. You'd also be starving the engine of air. I'm sure you have done this, but have you tried uninstalling the airboxes and re-installing everything to ensure you have a tight seal?

S14roller

Wrong post

Vash

Could be the intake manifold gasket.

How long have you had the ROW's/aFe's installed? Cel right after install?

You don't have your charcoals, but do you have the old air boxes and filters? If so, see if reinstalling them gets rid of the cel. Swap your stock filters for aFe's (in stock air boxes), drive cel free for a week or so, throw the ROW's back in.

C63BLUE

Fair enough, when I opened them, there seemed to be enough room to layer something on top since stock pics always seems like the charcoal and where the AFE filter sits now is about the same size, but I could be wrong.

Yes, took them out, reseated them, and made sure everything was buttoned up tight.

Car drove for about 100 miles with them no problems, and it’s possible I’m getting the code from bad gas (coincidentally, CEL came on after filling up). I’m going to run through the rest of the tank and refuel with some fuel injector cleaner and my usual station and see if that does it.

Was just starting to plan my plan B if gas wasn’t the issue. Don't have the stock filters or box, but hoping it's the gas.

Autosport7

Don't you just need this:
http://www.partsgeek.com/gbproducts/...SygaAgg78P8HAQ

chrisridebike8

^^^nah that looks like the cabin filter. That's for the climate control and HVAC

abcut973

You probably have a leak somewhere.
I would try different scenarios:
- reinstall OEM boxes + charcoal + OEM filters, clear code and drive for a while,
- No CEL? Then swap filters with AFE, drive,
- No CEL? Then swap boxes with OEM filters and drive,
- No CEL? Then put back the AFE + ROW

If you have CEL (same code) in all cases you have my friend a vacuum leak (intake manifold gasket, pcv valve)

As well if you don;t get any codes for fuel pressure regulator or gas cap the refuelling you did is just a coincidence.

GL

sinape62

When I first put in my ROW boxes, I noticed the (right box facing the engine from the front bumper) corner nearest to the MAF, I (very slightly) pinched the airfilter. It was the stock filter so I could see a bit of orange gasket visible... I took it apart and reseated it. Also before I loosened the clamps I put an alignment mark as I wasn't sure if there is a torque value for the clamps. Anyway, I got not CELs. I'll have to do this all over again after I receive my dry filters from Weistec.

AMGPower88

So everyone who installs ROW air boxes and AFE filters who get a code? Or is it just because it wasnt installed right?

edwardsflight33

I installed ROW airboxes and the AFE pro dry s and haven't seen a single code. That was 5k miles ago.

tfthach13

I think some MY are more prone to CELs. I think the trend was the 2010+ had no problems, but 2009 and lower had problems with the slightest mods.

SaphGreyC63

Make sure everything is seated and sealed correctly.

Installed AFE filters the other day, its been about a week, no codes.

-Marlin-

wrong thread