Cutting out on hard Acceleration, No codes.
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From: New Jersey
how many keys do you hanging on the key ring? Wiggle the key in the ignition switch. and move the tilt on the wheel up & down see if that does anything w/motor running?(worth 2 cent!) Is it just the engine that cuts out or other things too? It will turn out to be something dumb we all have over looked in the end, But that is what makes us all smarter.
I had an issue just like this on a Mustang one time. I got aggravated and sold the car to a buddy of mine that later figured out the problem. I had installed a cold air intake on it that went through the fender and into the wheel well.....there was a shield thing that was supposed to guard the filter from tire debris and WATER!!!! My MAF sensor was getting wet air and screwing up everything!!
Check your intake system. Always start with the easy cheap stuff first!! Good luck
Check your intake system. Always start with the easy cheap stuff first!! Good luck
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If we are talking about an EcoBoost, it may be condensation in the CAC (intercooler) being pushed into the combustion chamber during boost. It's a very common thing with the F150 EB. It's the main reason we sell more oil separating catch can systems to their owners than any other vehicle.
You can drop it, dump it and flush it. If you have a lot of water and gunk in there than that was it. Then you have two options, drill a small weep hole or put a catch can system on the truck. The weep hole should be plugged with a self tapping screw to avoid boost leaks. Every once in a while take out the screw, rip around town at boost to push the water out and let it sit over night. Plug it again in the morning or...
Buy our oil separating catch can system for the F150 EcoBoost and never worry about it or valve coking again.
You can drop it, dump it and flush it. If you have a lot of water and gunk in there than that was it. Then you have two options, drill a small weep hole or put a catch can system on the truck. The weep hole should be plugged with a self tapping screw to avoid boost leaks. Every once in a while take out the screw, rip around town at boost to push the water out and let it sit over night. Plug it again in the morning or...
Buy our oil separating catch can system for the F150 EcoBoost and never worry about it or valve coking again.
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Well, I looked around for causes, checked the intake, everything was fine. I need to clean my MAF though, its a bit dirty.
The key chain thing (believe it or not) Ive had happen before LMAO, and now I just keep my truck key and a house key on the ring specifically because of that.
I have NOT replaced the spark pugs/wire/coil packs yet, but the coil packs look a bit sketchy to be honest. All the connections are good.
I also went under the truck and wiggled around the wiring for the crank sensor. Nothing, no hiccup or anything. I DID however notice that it doesn't solidly "Click" in place like it supposed to. I also have not had another incident of cutting out for a week or so. I also drove down to Chicago and back this weekend, (5 hour or so round trip) without issues. I guess I'll have to wait and see if it happens again, to troubleshoot further.
The key chain thing (believe it or not) Ive had happen before LMAO, and now I just keep my truck key and a house key on the ring specifically because of that.
I have NOT replaced the spark pugs/wire/coil packs yet, but the coil packs look a bit sketchy to be honest. All the connections are good.
I also went under the truck and wiggled around the wiring for the crank sensor. Nothing, no hiccup or anything. I DID however notice that it doesn't solidly "Click" in place like it supposed to. I also have not had another incident of cutting out for a week or so. I also drove down to Chicago and back this weekend, (5 hour or so round trip) without issues. I guess I'll have to wait and see if it happens again, to troubleshoot further.
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From: Burlington, VT
Alright, this is a bit annoying... Ive done searches, but not sure where to start.
I have a 1999 F150, 4.6 4X4
Under hard acceleration, I have an extremely heavy miss. Miss would probably be a bad way to describe it.... it simply cuts out completely.
The tach doesn't drop or go wonkey when this happens, nor do any of the lights cut out. There is NO check engine light displayed, and no codes pulled from the computer. Its literally like you shut the motor off for a split second.
This has happened several times in the three months I've owned it. It needs a passengers side exhaust manifold (common leaky manifold issue) and every ONCE in a while it chugs slightly at idle. It always recovers on its own in a couple of seconds without me touching a thing. Otherwise, it runs fine other than maybe a slight hesitation while accelerating to highway speeds under moderate throttle. the fuel filter was replaces just prior to me buying it. This seems to be a very intermittent problem. Sometimes I can floor it and it will get up and go, no cut out, other times it will cut out until you get your foot out of it. Very strange It looks like it had a recent tune up, and I cant find any vac leaks or lose wiring anywhere.
One other strange occurrence was when I was idling in a car wash, the truck suddenly died like I cut off the key. It re-started immediately without issue.
Any ideas where to begin? Its obviously something strange, because it has yet to throw a check engine light at me. Does anybody have a suggestion?
I have a 1999 F150, 4.6 4X4
Under hard acceleration, I have an extremely heavy miss. Miss would probably be a bad way to describe it.... it simply cuts out completely.
The tach doesn't drop or go wonkey when this happens, nor do any of the lights cut out. There is NO check engine light displayed, and no codes pulled from the computer. Its literally like you shut the motor off for a split second.
This has happened several times in the three months I've owned it. It needs a passengers side exhaust manifold (common leaky manifold issue) and every ONCE in a while it chugs slightly at idle. It always recovers on its own in a couple of seconds without me touching a thing. Otherwise, it runs fine other than maybe a slight hesitation while accelerating to highway speeds under moderate throttle. the fuel filter was replaces just prior to me buying it. This seems to be a very intermittent problem. Sometimes I can floor it and it will get up and go, no cut out, other times it will cut out until you get your foot out of it. Very strange It looks like it had a recent tune up, and I cant find any vac leaks or lose wiring anywhere.
One other strange occurrence was when I was idling in a car wash, the truck suddenly died like I cut off the key. It re-started immediately without issue.
Any ideas where to begin? Its obviously something strange, because it has yet to throw a check engine light at me. Does anybody have a suggestion?
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From: New Jersey
I also went under the truck and wiggled around the wiring for the crank sensor. Nothing, no hiccup or anything. I DID however notice that it doesn't solidly "Click" in place like it supposed to. I also have not had another incident of cutting out for a week or so. I also drove down to Chicago and back this weekend, (5 hour or so round trip) without issues. I guess I'll have to wait and see if it happens again, to troubleshoot further.
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Yeah I did that just in case. So its happened again, a few times since my last update. Once was moderate accel from a stop sign, once was right after a downshift to pass someone. It REALLY random it seems. It also seems to happen more when its wet out.... I'm going to see if I can park it somewhere dark and mist the engine bay with some water, to see if we have any arcing.
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From: Among javelinas and scorpions in Zoniestan
*Sigh* Guess I'll jump back in here. NOW, it's sounding to me like ignition failure. In a quick rescan of your thread, I'm thinking you recently bought the truck and don't really know about its maintenance history?
What kind of plugs are installed? If they're not Motorcraft, or if they are past the change mileage, I believe that could cause the problems you're having. The "clue" I'm finally seeing is that this problem seems to be mostly associated with putting a load condition on the powertrain.
I guess the COPs could be bad too, but I'd start with the plugs.
- Jack
What kind of plugs are installed? If they're not Motorcraft, or if they are past the change mileage, I believe that could cause the problems you're having. The "clue" I'm finally seeing is that this problem seems to be mostly associated with putting a load condition on the powertrain.
I guess the COPs could be bad too, but I'd start with the plugs.
- Jack
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From: Corona, Crazyfornia
The misting thing is an indicator if you have spark plug wires, the voltage to the cop signal may not be enough to get a noticeable spark.
If wet conditions cause the issue I would suspect either the cops or the boots. But that should cause a specific misfire code.
I agree with Jack, at least pull the plugs and inspect them.
I just looked at your original post and saw that we are talking about a '99 4.6. Does that motor even have cops? If it has the coil pack and plug wires it could be a bad or cracked coil, or the plug wires could be the issue. If the wires and/or coil is bad, then plugs may be in order too.
Good luck
If wet conditions cause the issue I would suspect either the cops or the boots. But that should cause a specific misfire code.
I agree with Jack, at least pull the plugs and inspect them.
I just looked at your original post and saw that we are talking about a '99 4.6. Does that motor even have cops? If it has the coil pack and plug wires it could be a bad or cracked coil, or the plug wires could be the issue. If the wires and/or coil is bad, then plugs may be in order too.
Good luck
Last edited by jgger; Apr 30, 2015 at 12:44 PM. Reason: more stuff
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Nope, the Motor has the coil packs on each side, and plug wires. Pulling the plugs is going to come next. The coils (from visual inspection) appear to be Motorcraft and probably original. JackandJanet, you are right, i recently bought it. I don't know the maintenance history other than it recently had an oil change, and the fuel filter is brand new. And yeah, you are right, the issue only occurs when a "load" is placed on the powertrain.
I just bought a brand new set of motorcraft wires and plugs for it, Coils are coming soon. I'll wait to do the entire thing at once. I also just bought a serpentine kit (tensioner, idler and belt) as one of the pulleys (or both) are acting up and squeaking when wet. I also went ahead and bought a new passengers side exhaust manifold, new stainless studs/nuts, and a gasket to get rid of that damn loud leak. I'll be doing exhaust after the tune up also, as i can reach INSIDE the muffler at this point.
I'm leaning towards ignition myself with this particular issue. The strange thing is that I've always had other fords throw some kind of misfire code when they've acted up in the past. I guess if a coil was on the fritz, it might not show that way. I DO know that the coils look a bit discolored, and I wouldn't be surprised if when I take them off i found a crack or two. I'm betting the misting is going to show a Christmas light show when i do it.
I just bought a brand new set of motorcraft wires and plugs for it, Coils are coming soon. I'll wait to do the entire thing at once. I also just bought a serpentine kit (tensioner, idler and belt) as one of the pulleys (or both) are acting up and squeaking when wet. I also went ahead and bought a new passengers side exhaust manifold, new stainless studs/nuts, and a gasket to get rid of that damn loud leak. I'll be doing exhaust after the tune up also, as i can reach INSIDE the muffler at this point.
I'm leaning towards ignition myself with this particular issue. The strange thing is that I've always had other fords throw some kind of misfire code when they've acted up in the past. I guess if a coil was on the fritz, it might not show that way. I DO know that the coils look a bit discolored, and I wouldn't be surprised if when I take them off i found a crack or two. I'm betting the misting is going to show a Christmas light show when i do it.
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Oh another thing, the truck was apparently used the last 6 or so years exclusively to tow the owner's boat. It was owned by an old guy up the street (who i got to meet when i bought it). It sat pretty much all winter long outside each of those years, and i'm sure it only had the bare minimum maint to keep it up and running. I've replaced tires, tail light bulbs/housings, and brakes all the way around so far. The rear drum adjusters were frozen from sitting so long.
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From: Joplin MO
I had an intermittent miss in mine that was a bear to chase down. No codes. New plugs and wires didn't fix it. Finally figured out that it would happen after it rained, coil pack was cracked.
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So i just had the passengers side exhaust manifold replaced yesterday, they ended up having to extract 4 of the studs after they broke off... cost me 598 bucks total. (without the price of the manifold or studs)
NOW i can actually hear the engine running properly, i can tell it has a slight misfire at idle, its not exactly as smooth as it should be. this leads be to believe even more that its an issue with the ignition system.
NOW i can actually hear the engine running properly, i can tell it has a slight misfire at idle, its not exactly as smooth as it should be. this leads be to believe even more that its an issue with the ignition system.