extremely frustrated
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New User
Joined: Aug 2005
Posts: 16
Likes: 0
Let me clarify
The mas airflow sensor is new, I cleaned the old one and still had the problem so I replaced it.
I took the truck in today to have the transmission checked the tranny guy( a trusted friend of a friend) said the problem was not the transmission. While at the dealership I decided to bite the bullet and take it back to the service department. The truck was only showing the same 2 lean codes, after running a driveability test they found that the fuel pressure while driving is dropping down to 6psi.
The are saying the fuel pump is bad.
Is it possible for the pressure to 40 psi with the key on truck off, 35 at idle, then drop to 6psi while driving.
The mas airflow sensor is new, I cleaned the old one and still had the problem so I replaced it.
I took the truck in today to have the transmission checked the tranny guy( a trusted friend of a friend) said the problem was not the transmission. While at the dealership I decided to bite the bullet and take it back to the service department. The truck was only showing the same 2 lean codes, after running a driveability test they found that the fuel pressure while driving is dropping down to 6psi.
The are saying the fuel pump is bad.
Is it possible for the pressure to 40 psi with the key on truck off, 35 at idle, then drop to 6psi while driving.
Guest
Joined: Nov 2004
Posts: 7,988
Likes: 55
From: north west new jersey
Originally Posted by krewat
I must really be losing it... I'm on the 2nd page of this thread and didn't go back to page 1... where's that whip?
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Originally Posted by Wimmer
Is it possible for the pressure to 40 psi with the key on truck off, 35 at idle, then drop to 6psi while driving.
At work the other day I had an F-150 that the pressure dropped to about 8 psi under load. The inlet screen on the pump was plugged, rusty water in the bottom of the tank. I cleaned out the tank, replaced the pump and fuel filter and it worked fine after that.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 420
From: Long Island USA
Originally Posted by Wimmer
Is it possible for the pressure to 40 psi with the key on truck off, 35 at idle, then drop to 6psi while driving.
So, it sounds like your first impression of it "running out of gas" was right, eh?
What do you need these guys for ?
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Originally Posted by krewat
Ooohhhhhhh..... .. ... yeahhhhh........
So, it sounds like your first impression of it "running out of gas" was right, eh?
What do you need these guys for ?
So, it sounds like your first impression of it "running out of gas" was right, eh?
What do you need these guys for ?
LOL!!!!!!!!!!!
Rich
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Senior User
Joined: Nov 2004
Posts: 265
Likes: 0
From: Lancaster, CA
Originally Posted by captchas
lean is mostly caused by a pluged air filter, unmetered air, low fuel pressure or a bad maf senser, since you changed it have good fuel pressure. and checked the rest. go back and carefully check all the vac. hoses for small crackes or being soft and check the intake manifold gaskets by spraying brake clean or carb cleaner at the gasket areas and around the hoses and see if it smooths out.
