P0170 after intake install

[DSMTUN3R]

P0170 "Fuel Trim Malfunction (bank 1)"

I went ahead and installed my intake which basically consisted of a hard pipe, high flow filter along with the 3" adapter and 3 replacement hoses. I know this is straightforward but I'm gonna go through what I did so that it might be easier to narrow the problem.

1998 Eclipse GS-T (106,000)

-Removed negative terminal from battery to prevent shorts.
-Removed the 3 hoses that are attached to thr rubber intake along with wiring harness to MAS. (By the way, what are those 3 hoses for? I know the one is for the ventilator for the valve cover but what are the other ones?)
-Unbolted all the garbage associated with the airbox.
-Removed dump tube and losened clamp to tube and removed the whole assembly.

Then I,
-Attached hard pipe with coupler (silcone, not the highest quality) with worm clamps.
-Replaced the smallest tube along with one that goes to the valve cover, BUT couldn't remove the hose that runs under the battery so I created a sort coupler with the extra hosing. (Seals tight)
-Reattached dump tube.
-Used silicone coupler to attached to MAS with worm clams and attached filter along with adapter to other side.
-Made sure everything was tight, reconnected the harness to MAS, and reconnected battery.

Problems that occured:

-2 DAYS later P0170 "fuel trim malfuction bank 1" is thrown.
-Extremely bad gas mileage. Less than 150mi. to a tank from about 250mi. to a tank.
-Power problems not really noticable until about 3.5 r.p.m. and above and under boost conditions (Bogging down, serious loss of power)

Problems thought to be from a basic intake install:

-Could be a bad MAS, but why??? I did nothing but unplug and plug.
-Could be front 02, buy why would it go bad from a intake install and wouldn't it throw a less than p0170?
-Could be clogged injector but I ran fuel system treatment at the last oil change and a bad injector wouldn't seem to cause bad gas mileage.
-Could be a intake leak but would it disable the system to the point that it throws a code and bogs down like hell and burn a load a gas??

I'm confused as hell and don't wanna go buy and bunch of parts and have them installed to learn that I wasted time and money. Does anyone have any ideas about what the problem could be?

 

[majik2k5]

Make sure you sealed everything up good. Sounds somewhat like a boost leak to a certain extent.

 

[DSMTUN3R]

Where do I get couplers that fit between the pipe and MAS? What size do I need for the pipe to turbo? Where should I get T clamps at?

 

[Rush]

could be your o2 sensor went out.made it look like it was from the intake...intake may have nothing to do with it.

 

[zippyshoe]

Double check all couplers from your MAS to your turbo inlet. Also, check that your MAS is connected properly to the wiring harness. Run a boost leak test to detect any leaks in the remainder of your intake system. Once any/all leaks have been fixed, see if this fault code returns. If it does return, then consider replacing your front O2 sensor. Your O2 sensor may be "dying" but not "dead" yet, which can generate a P0170 code without yet generating the actual fault code for a faulty O2 sensor (which happened to me a few weeks ago.) Let us know what you find. Hope this helps you!

 

[FORMONTOYA]

Just an adder.....

I could tell my car wasn't acting right and running a little rich. I knew I didn't have any boost leaks, so I pulled a couple of logs and could see that my upper front O2 readings were falling short, causing my fuel trims to go positive, thus running rich. I ordered an O2 sensor, and on the day the sensor came in I was on the way home from work and the CEL came on, checked the code...P0170 (Fuel Trim Malfunction).

I replaced the O2 sensor that night and now my trims are back to normal.

One thing to remember about O2 sensors is that if you have to do any work that involves removing/replacing one, DO NOT TOUCH THE BULB. The oil from your fingers will shorten the lifespan of the sensor.

Just thought I'd throw that in there for future reference.

 

[toybreaker]

^^^, what he said!!

I've also found that silicones can kill an o2.

Please be sure that any silicone/sealer/gasketing compound that you use is certified o2 sensor safe.

You wouldn't think that the stuff you use to seal anything on your motor could kill an o2. However, the pcv system will ventilate the vapors from the crankcase, and this will include the volitile compounds from your sealants.

What this means is that your o2 will "see/taste/smell" anything you put in the intake path, or even anywhere there's oil.

I've seen a couple of o2's get lazy/die from oil pan replacements where rtv was used to exccess.

I've been using the "right stuff" in a caulking gun for a few years now.

AWESOME sealant.

Even made a c.v. boot repair in ohio with it...had a pinhole from road debris on I-70 in a construction zone.

Hey, it's only temporary if it doesn't work... and that was 6 months/15k miles ago, and it's still holding....

ymmv, but if the surfaces are clean, this stuff is magic!!