96 F250 460 code help-

Reply Subscribe

Thread Tools

Search this Thread

Aug 29, 2010 | 09:04 AM

yjzonie

Thread Starter

Junior User

Joined: Aug 2010

Posts: 88

Likes: 0

96 F250 460 code help-

I have a 1996 f250 with the 460, and i'm getting two engine code. The first is, bank one running lean and the 2nd is bank two running lean.

I've switch out the fuel filter, not really bad at all. New plug, wires, cap, rotor,and fuel pressure regulator. I'm getting about 35psi fuel pressure. The truck runs great and getting good mpg for a big block. But would like to clear up the check engine light. Emissions coming up real soon...Any one out there have a good fix?

Aug 29, 2010 | 12:02 PM

96ford250

Elder User

Joined: May 2010

Posts: 970

Likes: 0

From: Northeast Ohio

your injectors maybe dirty

Aug 30, 2010 | 11:29 AM

yjzonie

Thread Starter

Junior User

Joined: Aug 2010

Posts: 88

Likes: 0

Cool, I check the injectors, but what other item could cause lean running condition. Drove today no check light, 30 mile trip. Went to leave and check light comes right back on. I'm Stumped!!!, but will check the injectors.

Aug 30, 2010 | 11:55 AM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

Likes: 1,753

From: Kentucky

Is your idle RPM high? If so that indicates a vacuum leak. That can be caused by leaking vacuum lines, rotted vacuum canisters or upper/lower intake gaskets. Another common cause of a lean code is a leak in the exhaust system. How old are the O2 sensors? They do have a finite life.

Aug 30, 2010 | 12:18 PM

Lazy K

Post Fiend

Joined: Jan 2005

Posts: 8,402

Likes: 10

Correct me if I`m wrong but is the fuel pressure not low at 35psi? I would have thought it should be 40psi at idle, more at WOT.
Low fuel pressure would cause a lean condition.

Aug 30, 2010 | 01:15 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

Likes: 1,753

From: Kentucky

My service manual indicates the fuel pressure is supposed to be between 28-45 PSI. 35 PSI at idle is a good number to me. I would expect 42+ PSI at WOT.

Aug 30, 2010 | 05:57 PM

yjzonie

Thread Starter

Junior User

Joined: Aug 2010

Posts: 88

Likes: 0

Quote:

Originally Posted by rla2005

My idle RPM's are right at 750 and just purrs. I've checked for vacuum leaks and have found none. The O2 sensors are only a month old, they were replaced thinking they were the problem at first.

Still looking for more suggestions, please keep them coming as I would like to get this thing corrected. And I've been to two mechanics and the issue has yet to be resolved.

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Nov 21, 2010 | 11:57 AM

JR_F350

New User

Joined: Jul 2010

Posts: 14

Likes: 0

I get the same problems, can't find anything vacuum related. Did you ever figure this out?

Nov 25, 2010 | 09:14 AM

#10

yjzonie

Thread Starter

Junior User

Joined: Aug 2010

Posts: 88

Likes: 0

No still getting codes. No vacuume leaks can be detected, changed the furl pressure regulator to an adjustable- runs much better but still getting codes. I just don't know