my car keeps throwing a check engine for a fuel trim malfunction..... I have replaced the fuel filter, ran injector cleaner, and put a new o2 sensor(before cat) on...what is the problem code p170 someone please help..

 

no need for all the exclamation points, I removed them from the Subject line.

 

How about you fill out your profile so we know what kind of car you have? I will guess its a 2g turbo and say check your map sensor.

 

map sensor being my mas?? if so what do u mean check it

 

Dude ,what kind of car do you have?

 

i have a 95eclipse gst im on a friends name i have ic piping and bov greddy... and i have catback exhaust no other mods

 

MAP...Manifold Absolute Pressure
MAS...Mass Airflow Sensor

they are not the same.

 

the 2G has a MAP sensor, i think its on the bottom of the intake manifold... but im no 2G expert, someone would have to give a second opinion on this.

 

that code is i believe this
170 FT IAT Fuel Trim Malfunction (Bank 1) 2.12.2.Bank 2 Sensor 3)

 

I had the same code.

The funny thing is that it probably doesn't have anything to do w/ fuel. ha.

My understanding of this code is this:
basically, your computer trims the amount of fuel being sent to the engine based on the amount of air coming into the engine. Your MAS plays into the reading on how much air is getting into the engine. The 170 is basically saying that you are not getting enough air into the engine and your computer can't trim the fuel enough.

For me, it was as simple as replacing the 02 sensor, and replacing my stock intake w/ an Injen intake. The reason why I replaced the intake was b/c my stock air box and filter was absolutely full of crap. It was blocking the flow of air, so I replaced it w/ an upgraded high-flow intake & k&n cone filter.

hope that helps.