PO174 only

[Dan04COBRA]

Had some overheating issues I solved and about a week later PO174 lean popped up.

At 180 degrees, my aeroforce shows

Short Trim B1 4.6
Short Trim B1 96.1%

Both readings are at 2500.

At idle its

B1 -0.07
100%
Bank 2 has similar short trim readings

Bank 2 is reading virtually all the time, idle. 2500rpm, driving etc Long Trim 25.5
100%

The o2 millivolt on my aeroforce shows b1 o2 fluctuating from 66 up to 1000 at idle All over the place. B2 o2 hovers around 260-300 at idle.

I've searched for vac leaks and haven't found anything yet. Had a suspect hose on the throttle body and replaced it. Cleared code and it comes back after about 20 miles. No funny idle, no misfire.

 

[01yellercobra]

I would say you need a new O2 sensor.

 

[Dan04COBRA]

Bank 2 o2 millivolts doesnt oscillate like bank1. Bank2 gradually goes up while driving messing with the throttle but doesn't respond like B1 does.

Can I move the bank2 o2 sensor and see if it goes away since my rear o2s are off in the tune?

 

[01yellercobra]

Well, your code is for bank 2. And you say bank 2 isn't responding. So kinda points to it. Yes, you can swap the sensors side to side to see if the code follows. Your rear O2s have nothing to do with this code or how the up stream sensors.

 

[hotcobra03]

switch them..

Had some overheating issues I solved and about a week later PO174 lean popped up.

At 180 degrees, my aeroforce shows

Short Trim B1 4.6
Short Trim B1 96.1%

Both readings are at 2500.

At idle its

B1 -0.07
100%
Bank 2 has similar short trim readings

Bank 2 is reading virtually all the time, idle. 2500rpm, driving etc Long Trim 25.5
100%

The o2 millivolt on my aeroforce shows b1 o2 fluctuating from 66 up to 1000 at idle All over the place. B2 o2 hovers around 260-300 at idle.

I've searched for vac leaks and haven't found anything yet. Had a suspect hose on the throttle body and replaced it. Cleared code and it comes back after about 20 miles. No funny idle, no misfire.

reading o2s..

bank 1 will be different than bank 2..

number will always change..

swap side to side front o2s..

code will follow a bad sensor..

I expect it stays the same..

anti freeze will blow a o2 sensor..

most common..vaccum hose under blower..doesn' always set 171/174 together..

vac hose on exhaust..to dpfger..those will throw 174..

 

[Buckwheat 1]

I just cleared an intermittent issue with the same code. It would only happen after restarting the car after a long or short drive. Looks like it was the PVC valve.

 

[Buckwheat 1]

Had some overheating issues I solved and about a week later PO174 lean popped up.

At 180 degrees, my aeroforce shows

Short Trim B1 4.6
Short Trim B1 96.1%

Both readings are at 2500.

At idle its

B1 -0.07
100%
Bank 2 has similar short trim readings

Bank 2 is reading virtually all the time, idle. 2500rpm, driving etc Long Trim 25.5
100%

The o2 millivolt on my aeroforce shows b1 o2 fluctuating from 66 up to 1000 at idle All over the place. B2 o2 hovers around 260-300 at idle.

I've searched for vac leaks and haven't found anything yet. Had a suspect hose on the throttle body and replaced it. Cleared code and it comes back after about 20 miles. No funny idle, no misfire.

The PCV is on bank 2. The PVC valve can be the leak.