Lean on Bank 2 only

Reply Subscribe

Thread Tools

Search this Thread

Jul 26, 2005 | 05:36 PM

dphill

Thread Starter

New User

Joined: Jul 2005

Posts: 9

Likes: 0

Lean on Bank 2 only

Getting a PO174 error with check engine light on in '97 Expedition. Have replaced fuel filter, replaced both O2 sensors up from cat's, replaced intake manifold gaskets, checked gas pressure, 30-42 psi.
PCV line and elbows appear to be fine.
111,000 miles, problem surfaced at around 90,000, no driveablility issues, just an annoying light.
Thanks,

Jul 26, 2005 | 06:02 PM

IB Tim

FTE Leadership Emeritus

Joined: Jan 2003

Posts: 161,999

Likes: 75

From: 3rd Rock

...Welcome to Ford Truck Enthusiasts! Please read the Guidelines, it will help you to navigate through and understand this site.
Stick around someone will be by shortly to answer your question.
We are happy you have chosen the best source for Fords!

Enjoy FTE....and
JOIN CLUB FTE -SUPPORT THE FORUMS!
…..See you on the boards.

Jul 26, 2005 | 08:56 PM

2Fords1Jeep

Elder User

Joined: Mar 2005

Posts: 521

Likes: 1

From: Southern New England

Have you checked the MAF sensor?

Jul 26, 2005 | 11:13 PM

dphill

Thread Starter

New User

Joined: Jul 2005

Posts: 9

Likes: 0

Haven't checked the MAF yet. Wouldn't that affect both banks and trip both codes?

Thanks for the ideas!

Jul 27, 2005 | 05:54 PM

dphill

Thread Starter

New User

Joined: Jul 2005

Posts: 9

Likes: 0

Cleaned MAS as per other posts on this forum. Reset the computer and went for a drive. Seems to have worked.

Thanks,

Jul 27, 2005 | 09:48 PM

FTE Herman

Post Fiend

Joined: Jun 2003

Posts: 5,983

Likes: 2

I just got done clearing the code for the second time. I'm just a shade under 90K. If I figure it out, I'll let you know.

Jul 28, 2005 | 04:36 AM

2005Mariner

New User

Joined: Jan 2005

Posts: 23

Likes: 0

Fuel injectors...

You may have an injector that is going bad and leaning out a cylinder? Have you tried running some cleaner through them? If you pulled the plugs, were any of them white in color, which tends to indicate a lean condition. Are you experiencing any detonation (pinging)? Running lean is a bad thing, that could cause an engine failure. Hope it is something minor.

Last edited by 2005Mariner; Jul 28, 2005 at 04:41 AM.

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

10 Most Surprising 2026 Ford Truck Features!

Joe Kucinski

Top 10 Ford Trucks Coming to Mecum Indy 2026

Brett Foote

5 Best / 5 Worst Ford Truck Wheels of All Time

Joe Kucinski

Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!

Joe Kucinski

Every 2026 Ford Truck Engine RANKED from WORST to FIRST!

Michael S. Palmer

The Best F-150 Deal of Every Trim Level (XL through Raptor)

Joe Kucinski

Jul 28, 2005 | 03:16 PM

Sanchez_315er

Senior User

Joined: May 2005

Posts: 245

Likes: 0

From: Rochester, NY

Did you get this error before or after the intake gaskets?

Jul 28, 2005 | 04:44 PM

#10

dphill

Thread Starter

New User

Joined: Jul 2005

Posts: 9

Likes: 0

Before the intake gaskets. Had the error for about 20,000 miles. Doesn't affect drivability at all. Mileage is a little lower but that's it. We listed for vacuum leaks and heard a faint leak in the intake area. The gaskets were starting to separate (a common problem I've heard) but no major blow outs. Bolted it back together and the code came back. Since then I've replaced the pvc line and valve and cleaned the MAS and cleared the codes. Code has not shown back up.