Won't Start over 70 Degrees F

1994 Ford E150 5.0L
Will not start when the weather is above 70 Degrees F
No fire from coil

Check the coil primary and secondary resistance. If the coil checks out, the ignition module may be bad. Does this engine still have the ignition module attached to the side of the distributor?

Replaced coil
Module tested good
Wires to coil put on new connector
But. new connector wires are opposite

It ran today until the weather warmed to 70

I have been stranded for 4 days trying to get my Van started

Are you getting spark when it doesn’t start?

It seems to me that if you had 4 days of being stranded you could have typed up more than about 20 words about it all.

If it is that sensitive to ambient temperatures, it is probably something in the ignition circuit under the dash and not under the hood. Once the engine warms up, the underhood temps should push above 70 if the ambient temp is around 60. You may have a relay problem somewhere. I’m not sure where the relays are on this van.

Found power to the coil on both sides
Still no spark coming out

A coil also needs a pulse going into it - do you see that? You can probably test it with a test light or low power 12V bulb to ground. If the car isn’t running, you’ll see a steady 12V on that line. Once the car is running or starting, you should see that line pulse by seeing the light flicker.
If you do but don’t see spark, that coil is suspect.
If you don’t, the problem is likely whatever switches that line or wires to it. I’d look into the crank sensor and trace that signal through the system.
I doubt your van still has points or a hall sensor in the distributor but that basically is the function of the crank sensor on newer cars.

I am now looking at replacing the Pickup Coil

It does have a Distributor with Rotor

It having a distributor rotor doesn’t exclude it from having points but one would imagine a truck/van that late has a crank sensor instead.
So are you seeing a pulsed input to the coil?

No crank sensor. This ignition system uses a pick-up coil and sensor wheel under the rotor. You can check the impedance of the coil with a multimeter before replacing it. Just hoping to keep you from throwing parts at the problem.

Yeah from the sound of it that ship has sailed, burned at sea and subsequently sunk with all men and mouse aboard, huh?

I used to have two Ford’s with this engine, a pick-up and a Crown Vic. I’ve done a couple of ignition parts testing on them. As far as the pick-up coil, I’ve tested these on Ford’s and Toyota’s over the years. I had one car that had a pick-up coil puke the coil all over the rotor button. Fine copper wire wrapped tightly around the distributor shaft. Figured out that problem really quick once I pulled the cap off.

Replaced Cap, Rotor, Distributor
Still no Fire

Like asked before: are you seeing a pulsed input to the coil?

Or just take a shotgun, fill it with buck shot, shoot the engine and replace whatever was hit by the pellets. Repeat as necessary until it runs.

Seriously, dogzs, are you asking us what can be done about it not starting or are you telling us what you’re doing?

First get a scope on the coil or try the “blinking timing light” test that Remco suggested. As already mentioned, 12VDC on the coil primary is great, but you also need the igniter to be turning it on and off in order to get a spark. It’s the collapse of the primary voltage into the coil core that creates the voltage to jump the spark plug gap, not the 12VDC itself.

If you have no pulsing, check to see that the engine ground is good. If the strap connection has rotted and the ground has failed, you’ll get no spark. And yes, that can be temperature sensitive. A corroded connection is a resistive connection, and it can vary with temperature. Longshot, but worth checking.

If the spark is good, than it must be a fuel metering problem. Are the plugs wet when you remove them? Any gas smell? If the temp sensor has failed, the ECU may think the engine is always cold and be flooding the cylinders.

Post back.

After replacing Battery, Ignition Coil, Rotor, Cap, Distributor with Pickup Coil, Ignition Switch on a 1994 Ford E-150; 5.0L
I am about to replace the Ignition Module