Multiple problems '03 Sport Trac

[wfrancis16]

I own a '03 Sport Trac 4.0 SOHC MT 4x4. My MIL recently came on with 4 different faults. They are p0171, p0174, p0300, and p0316. Codes p0171 and p0174 originally came on a few months ago. I cleaned the MAF and cleared the codes. They didn't return until recently. Now all of the sudden, all four of these codes have shown up, along with some infrequent hiccups while accelerating.

This is one of the many problems that I am experiencing right now. Another one is my 4 wheel drive. I flip the switch, can hear the click of the relay, but it never engages, and the dash light doesn't come on.

Another problem, my power locks will not lock. Both of the power lock switches will unlock all of the doors, but nothing happens on either one when trying to lock them.

And another problem, the AC doesn't not turn on. Not much else to say about that.

And another problem, the oil pressure gauge dropped to nothing while driving. There was no change in the performance of the truck. It would stay there for a second and the shoot back up to normal. I checked the oil level, and it was normal. I was due for an oil change anyway, so I did that. Now the gauge will just stutter while driving. It has stayed in the normal range for the past few days.

If anyone could help with any of these problems, it would be much appreciated.

 

[ncranchero]

P0171 & P0174 are probably from the cracked rubber PCV elbow hose creating a lean condition. Actually the P0300 & P0316 may be from the same thing.
Here's a photo of the elbow that I stole from someone on the "other" site.

P0300 - Random Misfire The random misfire DTC indicates multiple cylinders are misfiring or the PCM cannot identify which cylinder is misfiring. Camshaft position sensor (CMP)
Low fuel: less than 1/8 tank
Stuck open EGR valve
Blocked EGR passages
One or more EGR passages may be blocked or partially blocked. If this is the case the Misfire Detection Monitor will indicate the EGR port to check for possible blockage.
P0316 - Misfire Occurred in the First 1000 Engine Revolutions P0316 code will be set in addition to any type B misfire DTC which occurs in the first 1000 revolution test interval, following engine start. Damaged CKP sensor
Ignition system
Fuel Injectors
Running out of fuel
Fuel Quality
Base Engine
Damaged PCM
Freeze Frame Data and the P03XX DTC will also be stored, indicating in which cylinder the misfire occurred.