F150 4.6

[Jerry Bradfield]

Hello board, I have been having a problem with my " 02 " F150 w/4.6 v8.

My engine runs fine while driving down the road.

But, as soon as I slow down and stop, my engine starts running rough and dies,

unless I keep my foot on the gas pedal and keep the rpms up.

My check engine light came on during this time.

I do not have a new style code reader, so I took my truck by Auto Zone & had

them read my fault codes ( P0171 ) & ( P0174 ) they told me that my two front

oxygen sensors had gone bad, so I replaced them from (A.Z.) & reset my computer.

Well, after 3 days still same problem and check engine light still on.

I took it back by A.Z. to have them re-read my fault codes, this time codes

( P1151 ) & ( P1153 ) came up, they (A.Z.) then told me that the rear two

oxygen sensors have also gone bad, I reluctantly purchased these also.

I then installed them, reset computer, and still, engine running rough & dying

when I stop, & check engine light still on.

I have taken the ( 4 ) new A.Z. oxygen sensors back out of my truck,& I am

going to take then back to A.Z. tommorrow. I should have known better than

to trust a non certified person to diagnose my truck.

Please, if any one has had this type of a problem, please give my some ideas

of what to check.

Oh yea, right before my truck started with this problem, I chaged my coils

out with new ones from NAPA and installed a new air filter.

I changed all of my coils out due to 4 of the 8 were not properly firing.

Thank you for reviewing my problem. And keep posting these great forums &

projects.





Thanks,

JAB

 

[Frank DiGi]

I had the somewhat the same problem with my 02 F150.. 4.8...Mine wouldn't die out it just would go crazy when I came to a stop. Ran rough and the rpm's would jump up and down like the engine wanted to die out. I took it to Ford and they have a service memo in the system about this. They called it roveing ide or something like that, but they took the truck in and redone the code's on thier computer diagnose never done it again. It took like half hour for them to redo all the code's and it worked out fine..Not sure if you have the same thing going on there.But I would take it to a good Ford dealer and let them look at it to see if its the same as the truck I had..Don't let the kids at AZ touch your truck...They are only good to sell you wax or light blubs what they know.....

Good luck Frank