I am in the process of trying to chase down a vacuum leak on my 2003 F150 with the 5.4. I have checked all lines and cannot find it. I decided to check the long term fuel trim and noticed that my bank 1 is slightly higher than bank 2 (screenshot attached). Is this enough to assume the leak is on the bank 1 side?
View 14 RepliesI've been having this problem since I've gotten the truck about year ago. it has very high long-term fuel trims and it seems no matter what I do I cannot get them to go down my fuel trims at idle are 39 Bank1 and 33 bank2 they go down to around 12>7 while driving what could this mean. And even weirder occasionally I get Bank 1 or bank 2 too lean codes at idle when cold starting???? 1997 Ford F150 4.6 ......
View 7 RepliesHere are the codes I'm getting:
P0455 - large evap leak
P1451 - main control (evap canister)
P0306 - cylinder 6 misfire
P0174 - bank 2 lean
are these all related? Or two separate issues. I have replaced all the evap lines with new lines. I have a new egr valve, and exhaust manifolds, and what should I look at 1st
What does this mean?? The o2 sensor(s) is reading lean?? 2001 F150 4x4 5.4
There was also an evaporator system code, but I think maybe someone left the gas cap loose? I unhooked the battery and it cleared everything. Truck started fine for a few tries. Will have it driven tomorrow to see if codes come back.
My reason for this is it was getting hard to start. I confirmed that fuel pump relay was not coming back on when cranking every time. Randomly it's fine, other times it won't start. Noticed it had CEL light, had it read at local Azone.
Don't know what to do about the "lean" issue? What would tell the pump relay to NOT turn on?
I removed the cover from the relay and inspected points, they were fine. Check with ohm meter=good. Watched it function without the cap on it. Would prime every time, but not come on when cranking every time.
Well I got the ubiquitous "Bank 1 Too Lean" code this morning. Yesterday I changed out the PVC Valve, Elbow and Hose assy.
I changed out the hose from the intake to the canister purge valve on the firewall next to the master brake cylinder, that one was like dust.
Today I'm changing out the rear O2 sensors, but I may change out the fronts when they get them in (very rural area hear).
I'll keep looking for vacuum leaks and change out the MAF sensor. I hate to think it may be the intake....
So my truck is reading a code at P0172 which means bank one is too rich. I replaced all of my o2 sensors, cleaned my MAF, and replaced PCV and hoses connected to it. What else could it be?
View 3 RepliesMy truck is a 4x4 lariat, I've replaced both dpfe valve and egr, and the intake manifold gasket. Still getting the egr insufficient code. It went away from a few months after replacing the intake manifold gasket but has returned. Where do I go from here? I vacuum tested the egr and that's working fine. Should I buy ANOTHER DPFE valve? Where do I go from here I'm desperate.
View 14 RepliesI have a 2000 f150 4.6 that would not run on bank2 ( the drivers side), even though the injectors and coils are all firing.While I was troubleshooting the problem I notice if you unplug the camshaft sensor and restart the truck it would then run on bank2, but the idle is rough.Can the PCM be the problem here. The only dtc codes are p1000, there are no misfire code at all, and it dose not show a misfire on the scantool data so I am lost.
View 9 RepliesThe p0340 code is the cam position right? Ready says bank 1.. Is there 2? Where the bank one is? And do I need to get on tdc on cyl one first or not?
View 3 RepliesI have a rough idle. I have replaced upstream o2 sensors, plugs, wires, fuel filter, dpfe sensor, cam sensor, and cam synchronizer. This has only moderately improved my problem. I still have the right bank, left bank too lean codes. Could it be something as simple but hard to find as a vacuum leak?
View 8 Replies2003 F150 v6 2wd 170k ... For a year I've only had codes P0171 and P0174 (lean bank 1 and 2). I was told it wouldn't hurt anything... I think now I should have taken care of it.
Anyway 3 weeks ago my truck started running a little rough. It was sputtering and had trouble getting up to speed, sometimes also the air switches from vent to defrost until switch gears and rpms go down. It gradually got a lot worse over 10 days while part was otw. A week ago i changed MAF and cleaned the black thing it's inside of. It started running better but still not good. I pulled my small trailer 2 days ago and it got worse after dropping the trailer.
Today checked codes at AZ and lean codes are gone and have p0304 (#4 misfire) and p0316 (crank sensor problem). Is this related.? Also Right before all the trouble I changed battery and alternator. Also i read online that MAF needed 2 weeks to relearn the way I drive to get correct gas/air ratio? Is that correct?
Also I read so many different things I needed to do during installation... Some say I need to turn key to the on position after unplugging old MAF then plug new one in... turn key to on position 10 times, Rev up engine, drive it rough for the first 2 minutes... etc. Is there a correct way to do it or is it vehicle specific?
Should I start by changing spark plugs and coils? The guy i bought it from and trust said he changed spark plugs right before I bought it. Will it ruin truck if I drive it? I've read so much but everyone says so much different things on the same topic. I'd what to start with or if this is related.
1997 f250 LD pick up 5.4L engine 131000 miles
Here is my story week ago code came on p0153 bank 2 sensor 1
Slow response ... now I been reading around and some people say bank 2 is passenger side other say it is drivers side or bank 1 is where cylinder 1 is , the point is I'm confused here for bank locations and sensor locations .....
Just started the truck after not running for a few weeks and drove around fine. Looked down and suddenly a CEL was indicated. Checked it with my Edge Evolution diagnostic mode and Code P0161 came up 2nd bank downstream heater circuit fault. I've also have an exhaust leak in the right passenger side exhaust manifold for about the last year. I've been waiting to install my newer 03' used engine when time and funds permit.
View 3 RepliesI own a 1998 Mitsubishi Mirage with about 190,000 miles on it. The engine light has started coming on and I get three codes:
P0170 Fuel Trim Bank 1P0136 Oxygen Sensor Bank 1 Sensor 2P0301 Cylinder 1 misfire
Read more: [URL] ....
I have a 99 f150 with the 4.2l v6 with a 5 speed 173000 miles. I picked it up not to long ago. When I first got it it had both the P0171 & P0174 lean on bank 1&2 it was also siting for a while. I replaced the fuel filter which was filled with black fuel, also changed the PCV valve, cleaned the MAF sensor, and changed the oil. I cleared the code, drove it for a little bit and the light came back on after 20 miles.
I then proceeded to replace the upper and lower intake manifold gaskets. Upon doing that i noticed that i was missing one of the linkages for the IMRC. I went to the junkyard and pulled off another linkage rod off the same motor. ordered new plastic clips, put the IMRC on cleaned everything up and began putting it back together. I also cleaned the Injectors while i had them out as well and put in new spark plugs and wires.
Put everything back together. code was cleared since the battery was disconnected. drove it and then the engine light came back on again. this time it was only the p0174. so i then both the upstream and downstream O2 sensors on bank 2, reset the code and it came back on again. I'm lost.
I just bought a 99 f150 and the check engine light came on with code p0171,system too lean bank 1. It runs and drives fine but has a strong smell of gas when I shut it off.
View 4 RepliesExplorer 2003 - 116 mi V8... Has been idling poorly at about 750 / 800 rpm never stalls in idle.
Check Engine Light came on - Read code said Too Lean Fuel Bank 1
Reset codes. After a couple hundred miles Check Engine Light
Once again Check Engine Light
Same error code Too Lean Fuel Bank 1
It has been since the 80's that I have attempted to do any work on a vehicle. How do I find a vacuum leak and where is my vacuum canister. I am assuming that it is a vacuum leak for anytime my engine has a load on it the air stops coming out of the dash vents and goes to the defrost vents. I have an 2000 F150 with the large engine with about 112,000 miles.
View 11 RepliesThis has been on going for the past year. The blend works fine. Fan speed works correctly. The selection for ac, max ac, etc., will only allow air through defrost vents. Vacuum leak?
1998 4.6 auto super cab
I had my fuel system cleaned by the dealership last weekend and I feel like I gained 50hp+ ... Now its throwing a P0171 about a week and a half later. My computer also listed P0174 under the pending codes or whatever the section was.
2003 F150 5.4L ... I cleaned the MAF sensor a couple weeks back which stopped a rough idle and I have put some 300+ miles on it since. about 200 miles since the fuel system cleaning.
I got home and popped the hood and it sounded like a vacuum cleaner. Guess it is a vacuum leak. I might need to stop using this ford house. I swear this is the second time there was a vacuum leak(I think, first time they said it was spark gap issue). I'll be heading back in the morning now.
I'm getting the p1131 error on my 2000 xlt f150 5.4l. I know it's usually a vacuum leak on the pcv hosing, which I did have at the back and replaced as well as other softer joining sections(3 to be exact lol), but I'm still getting this error. Changed out my plugs and cops(as they needed it) and the back two plugs on both bank 1 and 2(plugs 4&8) were both white! Since this is an obvious indication of a lean burning cylinder can I make the assumption my most likely problem is dirty fuel injectors on those cylinders?
View 13 Replies