One bank stuck lean, the other stuck rich, history of Evap system code also.

[jimmyducati]

A few months ago the SHO developed an intermittent studded at idle, even stalled a few times. I had been getting an O2 sensor fault (bank 2 sensor 1) so I replaced it with a new one that I've had on the shelf for a year or so. The stumble didn't fix and remains intermittent, maybe 1 of every 3 times I drive. Once I got a code indicating a fault with the Evap system but sadly I don't remember the specific number nor the exact fault. I do know that I get a HUGE vacuum when I refuel, so I assume there is an issue with venting in the tank.

Within the last week or so, Ive gotten P2195 and P2198 (one o2 is stuck rich and one is stuck lean). Ive checked for loose and cracked vacuum lines under the hood and have checked the connectors to the 02 sensors for chaffing and that the connectors are tight.

Any idea where I should start checking/replacing stuff? I'm hard against going to the dealer, they will just charge me $100 to do nothing more than I can do on my cell phone and start replacing components, witch i can do in my driveway.

 

[ZSHO]

Did you replace it with the OEM Motorcraft/NTK 02 sensor?
I would also replace the VENT CONTROL SOLENOID especially if original and can be had for fairly cheap and is a simple plug and play unit.,pic's below. Z
http://www.tascaparts.com/ford/taurus/8g1z9f945a/2010-year/sho-trim/3-5l-v6-gas-engine/emission-system-cat/emission-components-scat/?part_name=vent-control-solenoid

 

[SHOdded]

I would agree with an EVAP component being at the center of this issue.  Possibly the canister vent solenoid, which I believe is located under the vehicle, and serviced with the dust separator.


https://parts.levittownfordparts.com/ford/taurus/8g1z9f945a/2010-year/sho-trim/3-5l-v6-gas-engine/emission-system-cat/emission-components-scat/?part_name=vent-control-solenoid

 

[SHOdded]

Evaporative Emission Canister Vent Solenoid
Removal and Installation

The Evaporative Emission (EVAP) canister vent solenoid is serviced with the dust separator. For additional information, refer to Evaporative Emission (EVAP) System Components — Exploded View and Dust Separator in this section.

Evaporative Emission Canister
Removal and Installation

WARNING: Do not smoke, carry lighted tobacco or have an open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
WARNING: Do not carry personal electronic devices such as cell phones, pagers or audio equipment of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
WARNING: Always disconnect the battery ground cable at the battery when working on an evaporative emission (EVAP) system or fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
[list type=decimal]
[*]With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100-02 .
[*]Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
*** NOTE: Clean the Evaporative Emission (EVAP) canister vent solenoid electrical connector and the immediate surrounding area of any dirt or foreign material.
[*]Disconnect the EVAP canister vent solenoid electrical connector.
[*]Disconnect the fuel vapor tube-to- EVAP canister quick connect coupling. For additional information, refer to Section 310-00 .
[*]Disconnect the fuel vapor tube assembly-to- EVAP canister quick connect coupling. For additional information, refer to Section 310-00 .
[*]Disconnect the fresh air hose-to-dust separator.
[*]Remove the 5 nuts and the EVAP canister.
[*]To install, tighten to 9 Nm (80 lb-in).
[*]To install, reverse the removal procedure.
[*]Carry out the Evaporative Emission System Leak Test. For additional information, refer to Evaporative Emission System Leak Test in this section.
[/list]
Dust Separator
Removal and Installation
[list type=decimal]
[*]Remove the Evaporative Emission (EVAP) canister. For additional information, refer to Evaporative Emission Canister in this section.
[*]Release the 3 retaining tabs and remove the dust separator.
[*]To install, reverse the removal procedure. [/list]

 

[jimmyducati]

I replaced both with Bosch 02 sensors.. Ive always used them and haven't had a problem. Are they a known issue?

 

[SHOdded]

No known issues with Bosch vehicles on these cars, but it has been known to happen with some model lines, such as older Chrysler vehicles.

BTW, did you replace any injectors on your SHO?

 

[jimmyducati]

No known issues with Bosch vehicles on these cars, but it has been known to happen with some model lines, such as older Chrysler vehicles.

BTW, did you replace any injectors on your SHO?

I did, the #6 injector. The dealer tried to saying my misfire issue that has long been resolved was an issue with the coil... Only admitted it was an injector issue after the 100,000 mile warranty expired. Pulled the intake and fuel rail, pulled the old injector out with a puller tool and replaced it with a new stock injector. Pretty easy job considering the factors (direct injection, intake removal, etc.)

 

[jimmyducati]

The Evap system code came back today, P1450 Exsessive vacuum in fuel tank. When I have time to get to the garage and put the car on a lift, ill replace the vent solenoid (ordered it from rock auto and it just came in yesterday). Hope this fixes it, tired of this stumble at idle...

 

[SHOdded]

Good luck!