If it turns out to be a clogged catalytic converter, you owe me a box of Girl Scout cookies.
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94 F150 Cuts out above 2000 rpm
- Thread starter JZiggy
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Hey, before you go and start changing out this and that on a 94 F150, let me tell you what is, by far, the most common cause of this issue on this vehicle.
The capacitors inside your ECU have gone bad - the is a very common issue with this year and model of truck, once they get this old.
Unfortunately, this ECU is no longer made, and and they are very hard to find used (because they all have been scarfed up by others with the same problem) - and even if you found one used, it needs its capacitors done as well!
If you are an experienced solderer, and can do component repair on something like a computer motherboard, you can fix it yourself, after acquisition of the fairly rare capacitors it requires, or else I could refer you to an expert at this.
PM me if you want to take a crack at it, but I would bet money that it is the issue, this is very common on this truck.
The capacitors inside your ECU have gone bad - the is a very common issue with this year and model of truck, once they get this old.
Unfortunately, this ECU is no longer made, and and they are very hard to find used (because they all have been scarfed up by others with the same problem) - and even if you found one used, it needs its capacitors done as well!
If you are an experienced solderer, and can do component repair on something like a computer motherboard, you can fix it yourself, after acquisition of the fairly rare capacitors it requires, or else I could refer you to an expert at this.
PM me if you want to take a crack at it, but I would bet money that it is the issue, this is very common on this truck.
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Originally Posted By: LScowboy
Hey, before you go and start changing out this and that on a 94 F150, let me tell you what is, by far, the most common cause of this issue on this vehicle.
The capacitors inside your ECU have gone bad - the is a very common issue with this year and model of truck, once they get this old.
Unfortunately, this ECU is no longer made, and and they are very hard to find used (because they all have been scarfed up by others with the same problem) - and even if you found one used, it needs its capacitors done as well!
If you are an experienced solderer, and can do component repair on something like a computer motherboard, you can fix it yourself, after acquisition of the fairly rare capacitors it requires, or else I could refer you to an expert at this.
PM me if you want to take a crack at it, but I would bet money that it is the issue, this is very common on this truck.
Good thing many remanufaturing companies can rebuild one.
Another thing to keep in mind is that on older EFI engines, there would be a cam position sensor in the distributor, and that sent information to the computer so it could inject fuel and time spark. The injectors would be fired simultaneously, or sequential injection was possible if one tooth on the sensing ring was different from the others. Usually I end up repalcing them on Dodge Magnum 3.9, 5.2, and 5.9 engines, but it can happen to any engine that uses such a sensor.
Hey, before you go and start changing out this and that on a 94 F150, let me tell you what is, by far, the most common cause of this issue on this vehicle.
The capacitors inside your ECU have gone bad - the is a very common issue with this year and model of truck, once they get this old.
Unfortunately, this ECU is no longer made, and and they are very hard to find used (because they all have been scarfed up by others with the same problem) - and even if you found one used, it needs its capacitors done as well!
If you are an experienced solderer, and can do component repair on something like a computer motherboard, you can fix it yourself, after acquisition of the fairly rare capacitors it requires, or else I could refer you to an expert at this.
PM me if you want to take a crack at it, but I would bet money that it is the issue, this is very common on this truck.
Good thing many remanufaturing companies can rebuild one.
Another thing to keep in mind is that on older EFI engines, there would be a cam position sensor in the distributor, and that sent information to the computer so it could inject fuel and time spark. The injectors would be fired simultaneously, or sequential injection was possible if one tooth on the sensing ring was different from the others. Usually I end up repalcing them on Dodge Magnum 3.9, 5.2, and 5.9 engines, but it can happen to any engine that uses such a sensor.
Originally Posted By: LScowboy
Hey, before you go and start changing out this and that on a 94 F150, let me tell you what is, by far, the most common cause of this issue on this vehicle.
The capacitors inside your ECU have gone bad - the is a very common issue with this year and model of truck, once they get this old.
Unfortunately, this ECU is no longer made, and and they are very hard to find used (because they all have been scarfed up by others with the same problem) - and even if you found one used, it needs its capacitors done as well!
If you are an experienced solderer, and can do component repair on something like a computer motherboard, you can fix it yourself, after acquisition of the fairly rare capacitors it requires, or else I could refer you to an expert at this.
PM me if you want to take a crack at it, but I would bet money that it is the issue, this is very common on this truck.
I had this problem with an 88 F150. It did not exactly have those symptoms, but yes, the ECU is VERY hard to find. Weird considering how many of those trucks are out there.
Hey, before you go and start changing out this and that on a 94 F150, let me tell you what is, by far, the most common cause of this issue on this vehicle.
The capacitors inside your ECU have gone bad - the is a very common issue with this year and model of truck, once they get this old.
Unfortunately, this ECU is no longer made, and and they are very hard to find used (because they all have been scarfed up by others with the same problem) - and even if you found one used, it needs its capacitors done as well!
If you are an experienced solderer, and can do component repair on something like a computer motherboard, you can fix it yourself, after acquisition of the fairly rare capacitors it requires, or else I could refer you to an expert at this.
PM me if you want to take a crack at it, but I would bet money that it is the issue, this is very common on this truck.
I had this problem with an 88 F150. It did not exactly have those symptoms, but yes, the ECU is VERY hard to find. Weird considering how many of those trucks are out there.
Originally Posted By: artificialist
Good thing many remanufaturing companies can rebuild one.
Unfortunately few to none of them do a good job, especially when it comes to using the correct and fairly rare type of low-ESR capacitors required. Or putting in the correct size capacitors when they are a weird rare size and not available easily.
Good thing many remanufaturing companies can rebuild one.
Unfortunately few to none of them do a good job, especially when it comes to using the correct and fairly rare type of low-ESR capacitors required. Or putting in the correct size capacitors when they are a weird rare size and not available easily.
Last edited:
Originally Posted By: Lubener
Originally Posted By: 4wheeldog
The symptoms sound like a plugged fuel filter, to me.
I agree. Possibly cannot get enough fuel when demand is at highest.
I disagree. If it was a plugged fuel filter the cut off RPM would be different between being in neutral and driving down the road under load. Driving down the road would cause it to cut out sooner than being in neutral. I also doubt it would shut off like turning the key off. That sounds like an ignition control issue.
Originally Posted By: 4wheeldog
The symptoms sound like a plugged fuel filter, to me.
I agree. Possibly cannot get enough fuel when demand is at highest.
I disagree. If it was a plugged fuel filter the cut off RPM would be different between being in neutral and driving down the road under load. Driving down the road would cause it to cut out sooner than being in neutral. I also doubt it would shut off like turning the key off. That sounds like an ignition control issue.
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