My truck has almost 127k, so I know it's getting old. Still though, in the last week or two, it seems like the performance has really dropped, and the motor bogs down real bad.

I've replaced the fuel filter, changed oil, cleaned MAF, cleaned IAC valve (to fix idle). The truck had a tuneup this past September where the plugs/cop were changed, and the fuel pump was also replaced.

What can I do to get rid of the bogging?

Also, during this last winter when I would start the truck in the cold, the oil pressure guage would randomly drop for a second or two and then go back to normal. Once the motor warmed up, it'd stop. I was told by someone that there could be a buildup of oil sludge in the heads. Is this true?

edit: I do have a CEL on, but last I checked, a few weeks ago, it was something about the DPFE upstream hose disconnected or something, but I was told it had to do with emissions, that was it.

 

So you took care of your cel light problem and no longer have a light on?

Sounds like it could be the plugs - are they Motorcraft ?

Also sounds like it could be the trottle body and elbow - that's a common problem. Whens the last time it was removed and cleaned?

 

I still have the light, I've been meaning to take care of it, but haven't really had the time. I'm going to hopefully take care of it sometime early this week and have the codes pulled again to be sure.

As for the plugs, I don't know if they're Motorcraft or not, I didn't change them last. For the stuff I don't do to my truck, I take to this guy who used to be a Ford mechanic whom I trust my truck with.

The throttle body + elbow have never been removed/cleaned. I did spray some sort of foam (not seafoam) into the throttle body intake that was supposed to clean some of the gunk out. This was probably 2 months ago. I guess I should go ahead and remove/clean it.

edit: I don't want to start a new thread for this, so I'll add it in here. Depending on how hard I accelerate, I get a hard shift from first to second. From what I've read, it could be the torque converter locking up. What exactly does this mean, and what do I need to do to fix it?

 

First stop by Auto Zone and get your codes read and write them down - Auto Zone will do this for you free of charge. They might try to tell you whats wrong but it's better to report the numbers you received back here for one of us to diagnose. We are Ford specific here.

Take a 7 millimeter and pull COP #1 , I'll post a pic of it - then the plug to see what's in there.

If you never cleaned the throttle body - I seriously recommend it .. -

http://www.fordf150.net/howto/throttlebodyclean.php

COP #1 has the yellow sticker on it and I have a #4 on the side of it , disregard the #4 , that's actually #1 I just switched them ...

 

For this - I would reboot the computer so it will re-learn and retest fuel trims and trans tables. Fix the motor problem first , then reboot..

 

Autozone is who I've been using to pull the codes. I'll swing by there tomorrow to check again. I'll also check the COP tomorrow to see what it is and I'll get back to you on that. If I have time I'll tackle the throttle body as well tomorrow. I appreciate the help.

 

Ok thanks. I reboot the computer by removing the negative from the battery and touching it to the positive correct?

 

Nah , you don't have to do it that way - before working on your truck you ALWAYS unhook the negative cable. In this case , while your checking to see what plugs your running - disconnect the positive and negative both.

ALWAY's reconnect the positive cable first , then the negative..

Before you do any of this - get those codes pulled

 

The plugs are Motorcraft. Do you think I should replace them? They really shouldn't go bad so soon.. Also the code I was getting was a P1405. I was going to clean the TB but ran out of time, hopefully tomorrow I'll get to that.

 

True... I never used to disconnect the battery cables until I was changing my plugs and hit something with the wrench and made a spark. Couldn't get the truck to do anything. It took me forever but I finally figured out I blew the master fuse. It's good advice....

 

I've done the same thing ross - way back when

 

I guess I should start doing the same then

 

If you have more than 60,000 on the plugs , then cahnge them - or if your close to that, you might wanna think about it.

You need to replace the DPFE sensor. Don't go to a third party vender for this part. Ford recently updated the DPFE sensors and you can only aquire the updated sensors at the dealerships. The other venders sell the pre-updated ones - you don't want that one..

 

The plugs were changed this past September, probably 15k or so miles ago tops. How much would the newer sensor cost me? Is replacing the sensor something I could do, or would Ford have to do that? I was told that the DPFE was emissions related and wasn't really anything worth seriously worrying over performance wise..

 

Great!! Then you need a DPFE , heres the list -

Parts
. OEM Part
. Price
Pressure Feedback Exhaust Sensor
.
. Pressure Feedback Sensor
. F77Z9J460AB
. $112.47
Notes


You can change this your self - first make sure everything is pluged in on your old one and check your rubber hoses , you might not need one if a hose fell off or something - heres a pic of it, it's the box with the two rubber hoses plugging in the bottom of it -