F250 460ci will not start if truck is in very moist condition like high humidity. Any other time it will start right up.

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Hi,

Thank you for choosing ExpertHelp LLC. You may have a weak Hall effect module in the distributor. This provides the PIP signal to the TFI circuitry (and to the computer). If moisture is getting into the module, it may be taking out the ignition trigger signal at its source. The PIP signal is routed from the distributor over to the TFI module on the fender. It runs through a shielded cable. The shield has been known to cut into the insulation on the wires, causing an intermittent short and thus stalling/no start. There is a Ford TSB on that subject.

Two things you can try, the next time it quits.

1. Remove the SPOUT jumper and see if the spark comes back. This isolates the TFI from the computer and eliminates the possibility of the computer somehow interfering with spark generation.
2. Pull the high tension lead out of the distributor, and place it next to (but not touching) a good ground. Use a jumper wire to ground the negative lead to the coil primary (the one without the RFI capacitor connected to it). Turn the key on. Each time you momentarily ground and un-ground the coil primary lead, you should create a spark on the secondary side. This would prove that you have power to the coil, and that the coil is capable of generating a spark (not internally shorted). If you aren't sure which coil primary lead is positive and which is negative, don't try this.

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Ramy De Jesus

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Ramy De Jesus

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