Crank but no start

lordvoldemort

New Member
Sep 16, 2010
11
0
1
2003 V6 Mustang. In dry weather, the car just starts fine. In humid weather, especially after it rains; it doesn't start, but still cranks. I checked the ignition on one of the spark plug wires with an ignition tester and the spark is there. I also tested the fuel pressure at the schraeder valve, which was good. A few posts mention that there could be moisture in the Distributor cap, but this model has a coil pack which was replaced a couple of years back. Again, in dry weather, it starts as if nothing happened. There are no OBDII codes or check engine light either. Any pointers or advice will be highly appreciated.

Thanks
 
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OldSchoolNoe

Member
Nov 13, 2019
11
2
13
33
California
2003 V6 Mustang. In dry weather, the car just starts fine. In humid weather, especially after it rains; it doesn't start, but still cranks. I checked the ignition on one of the spark plug wires with an ignition tester and the spark is there. I also tested the fuel pressure at the schraeder valve, which was good. A few posts mention that there could be moisture in the Distributor cap, but this model has a coil pack which was replaced a couple of years back. Again, in dry weather, it starts as if nothing happened. There are no OBDII codes or check engine light either. Any pointers or advice will be highly appreciated.

Thanks
Hmmm might me something simple like improper ground on the coil pack. Buy some dielectric grease and coat the inside of the spark plug wire connections (side that connects to the coil pack). First disconnect the battery by removing the negative terminal first. Dielectric Grease acts as an insulator against water and I'm thinking water is getting inside the connector.

Around the :40 mark I did this to new spark plug wires
View: https://www.youtube.com/watch?v=jZDBhIV5cVE