Acceleration Stubble
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Junior User
Joined: Jul 2003
Posts: 94
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From: Ontario Canada
Acceleration Stubble
1986 F150 4x4
I am having problems with my newly rebuilt engine (302) stubbling when it gets up to 3200- 4200 rpm. The engine seems to stumble and miss fire at this point. (Recreational cam in the motor)
I have all new rotor, cap, plug wires, plugs and now a new ignition coil. (MSD Blaster coil Pt# 8227 for TFI units)
The code reader comes up with a code 18 which relates back to the coil, wires and TFI unit problems. I have not replaced the TFI unit yet
What is the main problem related to code 18 or can anyone give me an idea on the Code 18 solution. It is getting expensive replacing components?
Bruce P.
I am having problems with my newly rebuilt engine (302) stubbling when it gets up to 3200- 4200 rpm. The engine seems to stumble and miss fire at this point. (Recreational cam in the motor)
I have all new rotor, cap, plug wires, plugs and now a new ignition coil. (MSD Blaster coil Pt# 8227 for TFI units)
The code reader comes up with a code 18 which relates back to the coil, wires and TFI unit problems. I have not replaced the TFI unit yet
What is the main problem related to code 18 or can anyone give me an idea on the Code 18 solution. It is getting expensive replacing components?
Bruce P.
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Joined: Aug 2003
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I have a highly modified 302 but I dealt away with the TFI module. About 2 years back Ford was sending out checks for people who had replaced countless TFI modules. The design turned out to be a flaw. The other comment that sticks out to me is when you say a recreational cam. The range of 3200 to 4200 would more than likely be the range effected most by a cam and would in my opinion explains the stumble. The module would work off of factory settings and your new duration would require firing to be slightly different. If the timing was off or it wasn't getting enough power, it would not run well at lower rpm.
Thread Starter
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Junior User
Joined: Jul 2003
Posts: 94
Likes: 0
From: Ontario Canada
keyboardcowboy16
I read your note about your modified 302 and the problem with the TFI. If you move away from the TFI unit what did you replace it with?
I want to keep the fuel injection on this system and is there anything that can be adapted to run with this 1986 EEC-VI system or does the entire system (ignition and fuel injection) need to be replaced?
This has become very costly as I was told the HO cam was a good choice but due to the truck electronics I had to replace the cam after the rebuilt to a NON-HO cam to make it run
I can understand the cam duration would affect the timing but there must be variable TFI ignition system out there for this type of modification?
I heard there was a Ford Motor sport TFI unit but I did not buy this as it wa over $200 but I did buy a std TFI as Code 18 came up as a TFI module error. I have not opened the new one to replace it yet as I was going through some electrical continuity tests first. I can then return it
Any idea on what to change to? Your comments are greatly appreciated and I think you are right on the money.
Bruce P.
I read your note about your modified 302 and the problem with the TFI. If you move away from the TFI unit what did you replace it with?
I want to keep the fuel injection on this system and is there anything that can be adapted to run with this 1986 EEC-VI system or does the entire system (ignition and fuel injection) need to be replaced?
This has become very costly as I was told the HO cam was a good choice but due to the truck electronics I had to replace the cam after the rebuilt to a NON-HO cam to make it run
I can understand the cam duration would affect the timing but there must be variable TFI ignition system out there for this type of modification?
I heard there was a Ford Motor sport TFI unit but I did not buy this as it wa over $200 but I did buy a std TFI as Code 18 came up as a TFI module error. I have not opened the new one to replace it yet as I was going through some electrical continuity tests first. I can then return it
Any idea on what to change to? Your comments are greatly appreciated and I think you are right on the money.
Bruce P.
