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I have a tricky one here. Need to get the Texas smog done. CEL was on, o2-Sensor 2 bank 2. Put a new one on, checked all vacuum lines, good. When I clear out the PCM by removing the neg battery cable and using a jumper wire to the positive, the PCM clears right out, check engine light goes off and truck runs AMAZING, No miss, hesitation, nothing. But once the truck warms up and I turn off the engine and restart it, the light comes back on and the truck runs like crap, miss-sluggish. But if I reset the computer, runs perfect. What sets the computer off once the truck is turned off? If I don't kill the truck all day, it runs perfect. Kill it just once, it's over with. Any suggestions?
2003 F-150, 4.6, 285K, new motor 40K ago., 4x4, extended cab, auto. Light was on before the engine was replaced. Just gotten worse and didn't need smog in Arkansas, now if Texas.
I have a tricky one here. Need to get the Texas smog done. CEL was on, o2-Sensor 2 bank 2. Put a new one on, checked all vacuum lines, good. When I clear out the PCM by removing the neg battery cable and using a jumper wire to the positive, the PCM clears right out, check engine light goes off and truck runs AMAZING, No miss, hesitation, nothing. But once the truck warms up and I turn off the engine and restart it, the light comes back on and the truck runs like crap, miss-sluggish. But if I reset the computer, runs perfect. What sets the computer off once the truck is turned off? If I don't kill the truck all day, it runs perfect. Kill it just once, it's over with. Any suggestions?
2003 F-150, 4.6, 285K, new motor 40K ago., 4x4, extended cab, auto. Light was on before the engine was replaced. Just gotten worse and didn't need smog in Arkansas, now if Texas.
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?
Did you check the connectors and/or wires? I broke 2 coil connectors when I changed mine out because they were very fragile from the heat of the engine.
If you been running the truck with a mis-fire condition you could of been dumping raw gas into your Cats which will cause clogging... normally you can tell by a sulfur or rotten egg smell or they start to get really hot after reaching operating temp... to where they will glow red... this will cause a miss...
How do you fix the misfire if the problem is old gas? What do u suggest?
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?
I know this an old post, but it could help others if it can be figured out. How were the spark plugs when you pulled them out, specifically cyls 1 and 5? The P0300 code (random misfire) is the one code that would scare me. Sometimes the misfire monitor will interpret the cyl 1 and 5 as random but its not really there (ie false codes). Or it can indicate engine integrity. You said you swapped coils and checked other areas but did you confirm you were missing either fuel, spark or compression in cyls 1 and 5?
The wire bundle from the left hand/outboard connector off the PCM is routed under the AC line (tightly), and it causes the loom, and eventually the wires, to chaff on the AC line, causing arcing and shorting. The wire chaffed through in the pic goes to #7 COP. It was causing my truck to misfire on cyls 2, 5, and 8 and shutdown at random.
A little liquid electric tape, a 6" section of 1" heater hose split lengthwise, and a couple hose clamps solved it.
Originally Posted by carp104
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?
I have the whole right bank not running. Other side runs. Chains guides cam phasers all new.rocker arms cked. Compression good. There's spark and fuel. Very bizarre.
Originally Posted by Papa_J
The wire bundle from the left hand/outboard connector off the PCM is routed under the AC line (tightly), and it causes the loom, and eventually the wires, to chaff on the AC line, causing arcing and shorting. The wire chaffed through in the pic goes to #7 COP. It was causing my truck to misfire on cyls 2, 5, and 8 and shutdown at random.
A little liquid electric tape, a 6" section of 1" heater hose split lengthwise, and a couple hose clamps solved it.
my husband has a similar problem and I have been looking for months for a solution. I posted on another thread bit it is quite old and I may not get a response. He has a 2007 F150 5.4 3v that he has been trying to fix for about 6 months now. Originally the oil pump went out, cam locked up and it sheared the dial pin the phaser. Ford is no help and he and his mechanic friends just can't figure this out. Ford said crankshaft in play due to thrush bearings being bad so he replaced them. Now they say he just needs a new motor. He has sunk so much time and $ into this truck already so if anyone can help we would be so very greatful.
So far he has changed
Phasers
Chains
Tentioners
Oil pump
Oil filter
Spark plugs
Guides
Main bearings and bolts
Thrush bearings
Cam phaser bolts
He has checked/cleaned
VCT Solenoids
Oil passage hose
The truck will crank up and idle in and out of gear for an hr or more absolutely fine. When he puts it in gear and backs up it starts missing and making rattling noises. He can put it in N and race the motor and it will stop again until he puts it in gear and gives it gas.
The codes he got from it yesterday were
Cam retarded in Bank 2
Random misfire
On a picture on another thread crankshaft sprocket has the keyway at 12 and the little dot is at 7. Everything else I found says keyway at 11 and dot at 6. So I'm a bit confused. Could this be the problem?
my husband has a similar problem and I have been looking for months for a solution. I posted on another thread bit it is quite old and I may not get a response. He has a 2007 F150 5.4 3v that he has been trying to fix for about 6 months now. Originally the oil pump went out, cam locked up and it sheared the dial pin the phaser. Ford is no help and he and his mechanic friends just can't figure this out. Ford said crankshaft in play due to thrush bearings being bad so he replaced them. Now they say he just needs a new motor. He has sunk so much time and $ into this truck already so if anyone can help we would be so very greatful. So far he has changed[*]Phasers[*]Chains[*]Tentioners[*]Oil pump[*]Oil filter[*]Spark plugs[*]Guides[*]Main bearings and bolts[*]Thrush bearings[*]Cam phaser bolts He has checked/cleaned[*]VCT Solenoids[*]Oil passage hose The truck will crank up and idle in and out of gear for an hr or more absolutely fine. When he puts it in gear and backs up it starts missing and making rattling noises. He can put it in N and race the motor and it will stop again until he puts it in gear and gives it gas. The codes he got from it yesterday were[*]Cam retarded in Bank 2[*]Random misfire On a picture on another thread crankshaft sprocket has the keyway at 12 and the little dot is at 7. Everything else I found says keyway at 11 and dot at 6. So I'm a bit confused. Could this be the problem?
A quick thing to check off the list could be to clean the throttle body, I was having a issue similar to yours and I took my throttle body off and gave it a really good cleaning and it seemed to go away.
I had a 2004 f150 5.4 doing same thing. I replaced plugs then coil packs. Still did the same thing. Checked a lot of stuff and spent lots of money to find out that the k&n filter I put on it was the problem. The intake chamber for the filter necks down a bunch and it was sucking the oil off the filter and coating the throttle body causing it to stick. Cleaned the throttle body and it runs like a champ.
04-30-2016, 12:57 PM
