I have a 2003 4.6l f150 164000 miles. While back oil pressure dropped to 0. Then chattering. Then up then down. I changed the oil and filter, then flushed the motor, then changed the oil and filter again. 1500 miles, no problems, no chatter. Then all of a sudden it happens again. Oil level good and clean. Oil pump?Pick up tube?
View 10 RepliesI have an 01 F150 Lariat Supercrew 4x4 with the 5.4 Triton. The truck has 222,000 miles on it. Recently, I have noticed that when I am stopped at a stop light/stop sign while in gear, the oil pressure gauge drops to zero and the light comes on. As soon as I let off the brake and give it gas, it pops back up to normal. While driving, the needle never moves and stays consistent until I stop again, and back down to zero it goes.
If I put the truck in Park, the pressure goes back to normal. Same with neutral. It seems it is hit or miss and does not do this all the time, but I just wanted to see what your thoughts are. After doing some research I am leaning towards an oil pressure sensor/sending unit.... The truck runs perfectly fine, I just want to make sure it is not something more serious.
I've got a '98 F150.throwing codd 402, excessive flow EGR, also the oil pressure drops to absolute zero only when gear shifts but comes right back up. No knocking or other distress sounds in engine. I know I'm in need of an oil change. I already searched a bit and decided to swap out the DPFE sensor which I did purchase from the dealership. No code as of yet but what could that pressure drop be? Could a simple il change and filter fix that?
View 3 RepliesI have an 03 Explorer that had a starting issue. Long story short, it had no fuel pressure. So after testing the relay, I switched out the pump with an Airtex unit . All seemed fine...for a while.
Became hard to start again, checked Schrader valve with the key on, and not running, no pressure. Strange though, it would run.
So got the fuel pressure gauge on it. Turn the key and pressure will go to about 5-10psi and then drop to zero. Turn key off and on again, up to 5-10psi, then drop to zero. Turn the key to start and pressure goes up to 10psi, then starts, then goes to 30 while running and you can drive it around. Shut off motor and pressure goes down to zero.how the sending unit is supposed to hold fuel pressure and not release it? Is there some kind of check valve in the sending unit assembly that can be cleaned or does it need a whole sending unit with another pump? I already spent the $100 for the pump, and it is working if you can drive it!
I have had several issues getting to where I am now. The Neutral safety switch (MLPS) is new. The tranny has been rebuilt with new TC installed as well. The truck shifts out fin 1-2-3-4 until I hit 57mph. At 57 the od drops out and will not reengage until I drop down below that speed. I ran a diagnostic test on the TPS with my multi-meter and it all was in range on the voltages and was smooth through throttle movement etc.
View 6 RepliesSo my 99 F150 never got great MPG, but at least she was between 12 and 14 pretty consistently. However, she's spent a lot of time sitting, and now the MPG is right at 8. 9 or higher would be shocking. Any guess as to why this is? I know that engines need to be run now and again, but I can't beat 20+ MPG in my car and 40+ on my motorcycle, so she sits. I try to take her out once a month for a good drive to get everything heated up and moving and to burn any condensation that got in the oil. She's got fresh oil (not even 500 miles and 6 months), clean air filter, and fresh plugs and wires. I've also treated the gas with Sta-Bil at the proper mixture.
View 1 Replies'97 F150 4.6L 4wd automatic... My gauge jumps around, sometimes it works and other times it shows no pressure. Could that be the oil pump? Or is the gauge most likely bad? Whats the actual purpose of an oil sending unit?
View 6 RepliesSo I have a 1997 ford f150 v8 4.6 2w... I got codes p0171 and 174 my truck seems fine till the idle drops, it's weird when I have it on park it's fine if I turn the wheel left the idle drops when the ac turns on the idle drops and it's wasting crazy gas. Where should I start first in finding this problem?
View 12 Replies1998 f150 4.6 4x4 auto 180k .... Runs 100% other than a strange and inconsistent overheating issue.
On cold startup truck will warm up. Then the temp gauge drops to practically 0. After 15-20 seconds gauge shoots up to max and then falls back to normal after 15-20 seconds. Then it'll go back to driving normally. At some point it pukes.
I have a 2004 Explorer 4.0L v6 that I recently charged the AC in. The engine was rebuilt not to long ago so the AC was completely recovered (bought it from a friend), so I know I started fresh. I am not by any means a novice mechanic but, just dabbling into the AC world and have watched a ton of how to videos, and what not.
I went out and bought a set of manifold gauges as well as a vacuum pump. I do have the rear air on this one so it takes (correct me if im wrong) 56oz of refrigerant. I pulled a vacuum of 28 (mercury?) and it held it for a good hour so, I am pretty sure no leaks. I went ahead and charged the system... Compressor kicked on like normal, air got cold, and everything seemed to be going just like it should be. I went by just a random r134a ambient pressure chart NOT from ford.
I thought great this is going to be like new! Well, now the problem i'm having is in the mornings at say 65-85 degrees it blows ice cold. Once the sun gets higher in the sky, and it gets up to 95-100, it doesn't seem to be able to keep up, even driving for miles and miles. I noticed the rear air evaporater low side, doesn't seem to feel very cold either. Does this mean I might be over charged/under charged?
I have a video of the pressures at 2000 RPM, AC set to "max", both front and rear fans set to highest setting, windows down. At 31 seconds, the pressure drop is because I let off the throttle and let it idle for a bit, so you can see those pressures.
Copy of 04 explorer ac status - YouTube....
2004 Lariat. Ford F150, 5.4 Triton. Whenever I slow down, stop, or turn my truck will read low oil pressure, then all my gauges drops and it stalls out. I've taken it to my mechanic twice now. And twice he's replaced two sensors. Today I took it to Wal-Mart for an oil change and they said its probably why my check engine light is on code, T19. I've had that light on for 4 years now and this stalling out problem starts 3 months ago. So far its had regular oil changes, new air filter, two new sensors and im scraping money to throw at it. Hitting snow banks, other vehicles, and tree's... need to find the real problem before I go broke or worst kill someone in an accident.
View 1 RepliesI changed the sending unit and replace the oil filter with a motorcraft unit and still can't get the oil gauge to read pressure. Since it is a gear oil pump I don't believe it is the pump.
View 2 RepliesI am having an oil pressure issue on a 2000 F-150, 4.6L.
I recently put a new set of heads on the motor because of some valve damage. Anyways. The oil pressure gauge in dash would sit at around 3/4.. Drive it a couple miles and every time you would get back to idle (stop sign) it would drop to zero and the light would come on.
You could also hear it make a little noise like the top end wasn't getting oil. (Didn't run at idle long..) I figured it was obviously starved of oil so I put a new oil pump, timing chains/guides/tensioners on. (Which I probably should have done with the heads.) Same issue resulted, but no funny noises when the gauge drops off.
Suspecting that the sensor may be faulty and the dash gauge being useless anyways, I dug an old mechanical gauge out of a box and installed it. I'm getting similar oil results. (Under 25psi it seems.) I'm not sure if the gauge has just gone to crap over the years of being in a box. However, the previous low-oil pressure issue seems to confirm it's not the gauge.
I cleaned the oil pickup when I had the motor apart. It didn't seem dirty, but I sprayed it out regardless. The motor looked fairly fresh when I had it apart. Bearings looked solid, cylinder walls even looked freshly honed. From what I hear, the motor was a low-mileage replacement.
So what could cause a low-oil pressure issue? Bearings seem fine, oil pump is brand new.
How do you get to the oil pressure switch on a 1998 F150 4x4? I can see it over the top of the front axle but can't find any way to get my hand in to unplug the sensor wire. Do you have to unbolt and drop the axle down a couple of inches?
View 2 RepliesSo this has happened a few times pedal drops with no back pressure then give a bit pull it back up by hand and it's fine has happened 4 or so times in the last year. I'm reluctant to replace slave and master cylinders could it be anything else? 87 Ford F-150 hydraulic clutch
View 10 Replies2002 F150, 4.6 V8, 140k miles. Oil level good, oil was changed 2 months ago.
Driving along one day, out of the blue oil pressure light comes on, oil pressure gauge went to zero.
Engine did not run hot, no bad engines noises that I can hear.
Upon restart, oil pressure will be up on the gauge for minute or so, then goes to zero and oil light comes on.
Asked around, some say oil pump, some say oil filter or pickup tube.
this winter i have found that my truck's heater core isn't flowing, meaning i have hot on the upper hose and the lower is luke warm and there is no heat while running down the road. I have changed the t-stat and the heater core and radiator are new as of four years ago. last year i could roast a chicken with the heat. i also have no pressure in the radiator hose at all, engine runs at normal temp, no over heat situation and i don't smell any loss of antifreeze.
1999 f-150 4.6 150k
I have a 2001 Ford F150 4.6 liter V8 Super Crew. I use Castrol full synthetic oil and Fram filters...changing oil about every 10,000-12,000 miles and change filter at half way point.
Here is my issue: I noticed a slight rattle on passenger side of engine a few weeks ago but engine ran well & I wasn't sure if it may be a pulley from AC compressor or something else. It wasn't bad at all...more like a ticking sound.
Yesterday I drove to work with no problem and when I got ready to leave 9 hrs later, I noticed rattling was getting worse. I ran about 2 or 3 miles down the road and my oil pressure flatlined and light came on. This is the 1st time it has ever happened. By this time the rattling sounded bad, almost like it broke something on both sides of engine around valve cover area.
I pulled over immediately and had truck towed to shop down the road from my house, When my mechanic started it up this morning it had oil pressure and rattling was not near as bad. I put a new oil filter on it & topped off oil. He could not get to it today so I drove it home today for the weekend and by the time I got home (3 miles) it did same thing...flatline, oil pressure light on and rattling with no power (very sluggish).
I did notice the oil pressure light came off & on and gauge went up and down a couple of times before I shut it down. What the problem is? Oil pump maybe? I just didn't think oil pumps usually fail.
I am still battling a p0171 code on my 2000 f150 5.4. I checked the fuel pressure at idle it sits at 31. I remove the vacuum line off the regulator it goes to 41. When i give it throttle when in gear it will maintain at 30. And when I shut the vehicle off completely it will maintain 38. Just looking to see if this is correct numbers. I was trying to determine a weak fuel pump.
View 9 RepliesI was driving home last night and when I stopped at a light in town, I notice the oil pressure dropped and the light came on. So I pulled over and put in park to check my oil. As I put in park the pressure went back up. I dropped it back into gear and it went back down. What could be causing this? I check my oil and it was full. I also notice when I put it in gear and speed up the pressure goes back up and stays there till I slow down again.
View 8 RepliesI bought a 2002 f150 4x4 with a 4.6l. It has 250k miles on it. a couple days ago. It had no problems at all during the test drive or for the 150 miles home. Yesterday after it warmed up, the oil pressure dropped to 0 while at a red light and had a rattling noise. Not a knock but more of a rattle. I can't isolate where the rattle is coming from. Oil pressure comes back with just the slightest of increase Of RPM and seems To have plenty of power while driving. I had read to check the pressure manually but with the noise I sense there truly is a problem. the oil appears clear and is full. What I should be checking on this.
View 1 Replies