Rough Idle/Misfiring - HELP! (2006 F150 5.4L v8)
02-04-2017, 01:57 PM
#41
the black pearl
I am completely stumped here. I just bought a 2006 F150 with the 5.4l 3 valve triton engine about 5 months ago with 85K mi on it. Now at 90K the truck out of the blue starts to idle rough and shortly after the check engine light begins flashing. Pulled into Autozone and scanned P0300, P0301, P0305. Misfires cylinders 1 & 5.
Here is what I have checked so far:
-Si bet park Plugs (replaced)
-Coils (swapped, problem did not follow coil)
-Fuel Injectors (swapped, problem did not follow injector)
-Cam Sensor
-MAF Sensor
-Compression Check (engine has good compression)
-VCT Solenoids (replaced, problem seem to very slightly improved but still idling rough)
The misfire really is only noticeable at idle and as soon as you press the gas it's barely noticeable at all at higher rpms. There is also NO rattling or NO ticking or clicking noises during startup or any other time. This led me to believe it was the VCT solenoid instead of something like the cam phasers but apparently I was wrong. Could it be possible there are other error codes that haven't been thrown yet? Surely there has to be a little more than just two misfires - how do you work with such a vague code or am I not fully understanding them?
I'm about ready to throw in the white flag on this and take it in to the dealership - which I fear I will be told it's major $$$$.This seems to be a common problem with these trucks however every thread I find regarding this issue on any forum just dies dead in its track with no solution.
I guess my next step is to check the "real" oil pressure and see if there's any oil flow issues?
Has anyone solved this problem?
Here is what I have checked so far:
-Si bet park Plugs (replaced)
-Coils (swapped, problem did not follow coil)
-Fuel Injectors (swapped, problem did not follow injector)
-Cam Sensor
-MAF Sensor
-Compression Check (engine has good compression)
-VCT Solenoids (replaced, problem seem to very slightly improved but still idling rough)
The misfire really is only noticeable at idle and as soon as you press the gas it's barely noticeable at all at higher rpms. There is also NO rattling or NO ticking or clicking noises during startup or any other time. This led me to believe it was the VCT solenoid instead of something like the cam phasers but apparently I was wrong. Could it be possible there are other error codes that haven't been thrown yet? Surely there has to be a little more than just two misfires - how do you work with such a vague code or am I not fully understanding them?
I'm about ready to throw in the white flag on this and take it in to the dealership - which I fear I will be told it's major $$$$.This seems to be a common problem with these trucks however every thread I find regarding this issue on any forum just dies dead in its track with no solution.
I guess my next step is to check the "real" oil pressure and see if there's any oil flow issues?
Has anyone solved this problem?
02-04-2017, 02:06 PM
#42
the black pearl
the check engine light flashing is saying there is a miss, in other words raw fuel is going right into your cat/ exhausts and destroying the catalytic converters. Did that to mine, after banging my head into the wall I have up and changed them now it runs like a champ.
02-05-2017, 02:26 PM
#43
Junior Member
Join Date: Feb 2017
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Hello. Just read this entire thread and I'm having similar issues.
07' f-150 XLT. Low idle and rattling intermittently. Shakes the whole truck until I give it some gas. About to take it somewhere to get it looked at, but if it's going to be a 5k+ $ replacement, I'll just trade it in and get a different vehicle.
I happens most most often right after low acceleration, like parking garages or driveways. Used to happen maybe once a month but now it's happening daily.
07' f-150 XLT. Low idle and rattling intermittently. Shakes the whole truck until I give it some gas. About to take it somewhere to get it looked at, but if it's going to be a 5k+ $ replacement, I'll just trade it in and get a different vehicle.
I happens most most often right after low acceleration, like parking garages or driveways. Used to happen maybe once a month but now it's happening daily.
07-06-2017, 08:49 PM
#44
Junior Member
Join Date: Jul 2017
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
did you ever figure this out? I have a 2010 and I'm have about the same issue and I have done a few of the same test and they all seemed to give the same results I did a fuel pressure test and it started good then my fuel pressure fell instantly when I turned off the truck to 48 then within 10 minutes went to 42 and within 30 was down to 0psi, I've read that means there is a leak, there is no visible fuel leak anywhere so people are telling I possible have a stuck open fuel injector but no one can tell me a safe way to test it without buying some high dollar tester. Ive spent 1000 dollars in OTC testing gear already I'm about tapped out.. Could it be a fuel injector stuck open
07-12-2017, 11:13 PM
#45
Junior Member
Join Date: Jul 2017
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
misfires
I have an 2006 F150 5.4 liter. I had missfires starting at 65,00 miles. I replaced the plugs multiple times. All of them. Still had misfires. I replaced the COPS. Still had missfires. I replaced the fuel injectors. Still had missfires. I took it to the dealer. They stated it needed new plugs and wanted $800+. I just changed the plugs a week before and refused. I barely made it home because it misfired so bad after they got ahold of it. They were right, they broke three slamming it back together after I refused to pay them $800+ to replace new plugs. I spent the weekend extracting the three broken plugs.
My problem with missfires dissapeared after my transmission locked up at 81,000 miles with no other warning. The only warning I got was TRANSFAULT on the dash when I locked up. Needed a new planetary gearset. After the tranny was rebuilt, I had no more misfires. Im now at 115,000 miles.
My problem with missfires dissapeared after my transmission locked up at 81,000 miles with no other warning. The only warning I got was TRANSFAULT on the dash when I locked up. Needed a new planetary gearset. After the tranny was rebuilt, I had no more misfires. Im now at 115,000 miles.
08-04-2017, 06:16 PM
#46
Junior Member
Join Date: Aug 2017
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
I am completely stumped here. I just bought a 2006 F150 with the 5.4l 3 valve triton engine about 5 months ago with 85K mi on it. Now at 90K the truck out of the blue starts to idle rough and shortly after the check engine light begins flashing. Pulled into Autozone and scanned P0300, P0301, P0305. Misfires cylinders 1 & 5.
Here is what I have checked so far:
-Spark Plugs (replaced)
-Coils (swapped, problem did not follow coil)
-Fuel Injectors (swapped, problem did not follow injector)
-Cam Sensor
-MAF Sensor
-Compression Check (engine has good compression)
-VCT Solenoids (replaced, problem seem to very slightly improved but still idling rough)
The misfire really is only noticeable at idle and as soon as you press the gas it's barely noticeable at all at higher rpms. There is also NO rattling or NO ticking or clicking noises during startup or any other time. This led me to believe it was the VCT solenoid instead of something like the cam phasers but apparently I was wrong. Could it be possible there are other error codes that haven't been thrown yet? Surely there has to be a little more than just two misfires - how do you work with such a vague code or am I not fully understanding them?
I'm about ready to throw in the white flag on this and take it in to the dealership - which I fear I will be told it's major $$$$. This seems to be a common problem with these trucks however every thread I find regarding this issue on any forum just dies dead in its track with no solution.
I guess my next step is to check the "real" oil pressure and see if there's any oil flow issues?
Has anyone solved this problem?
Here is what I have checked so far:
-Spark Plugs (replaced)
-Coils (swapped, problem did not follow coil)
-Fuel Injectors (swapped, problem did not follow injector)
-Cam Sensor
-MAF Sensor
-Compression Check (engine has good compression)
-VCT Solenoids (replaced, problem seem to very slightly improved but still idling rough)
The misfire really is only noticeable at idle and as soon as you press the gas it's barely noticeable at all at higher rpms. There is also NO rattling or NO ticking or clicking noises during startup or any other time. This led me to believe it was the VCT solenoid instead of something like the cam phasers but apparently I was wrong. Could it be possible there are other error codes that haven't been thrown yet? Surely there has to be a little more than just two misfires - how do you work with such a vague code or am I not fully understanding them?
I'm about ready to throw in the white flag on this and take it in to the dealership - which I fear I will be told it's major $$$$. This seems to be a common problem with these trucks however every thread I find regarding this issue on any forum just dies dead in its track with no solution.
I guess my next step is to check the "real" oil pressure and see if there's any oil flow issues?
Has anyone solved this problem?
I would check knock sensors, that was the problem with my truck
11-05-2017, 11:05 PM
#49
Junior Member
Join Date: Nov 2017
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
I'm still 100% stuck with this. I went ahead and changed ALL the spark plugs myself - which was a nightmare as 4 of the 8 broke off in the head. 3 came out with the Lisle tool and one broke off the Lisle tool. I had to modify the tool pieces on a lathe and was able to get the last one out.
Anyway, the truck now has all new plugs, put die-electric gel on all coils - started truck and misfire still there.
My next step is to check oil pressure to see if the cam phasers may be the problem. This is incredibly frustrating and I'm almost out of places to look.
Anyway, the truck now has all new plugs, put die-electric gel on all coils - started truck and misfire still there.
My next step is to check oil pressure to see if the cam phasers may be the problem. This is incredibly frustrating and I'm almost out of places to look.
11-13-2017, 06:13 PM
#50
Junior Member
Join Date: Nov 2017
Location: NORTH ITALY (ALBA)
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Hi, I'm Paul From italy, i have a 2006 XLT
i have the same problem, in the first time the solution was locked phaser, the truck run very well for 1000 miles,
i parking the truck on a little climb in the morning, on the late afternoon i take the truck but the car slit on the gravel, i put 4x4
an the problem appeared ! the engine running like have misfire but the plug aren't wet, now i check fuel pressure OK
coli OK timing OK i'm very sad
in italy i haven't a people to ask a council
please help me
best regards Paul
i have the same problem, in the first time the solution was locked phaser, the truck run very well for 1000 miles,
i parking the truck on a little climb in the morning, on the late afternoon i take the truck but the car slit on the gravel, i put 4x4
an the problem appeared ! the engine running like have misfire but the plug aren't wet, now i check fuel pressure OK
coli OK timing OK i'm very sad
in italy i haven't a people to ask a council
please help me
best regards Paul