Having problems with your 2004 Ford F150 ?

Starting problem I have a 4.6l gas engine that does not like to start in the rain or humid weather. It will crank and crank for up to a minute or so before it will finally fire

Posted / edited by AnonymousUser on : 19-02-2018

Answers :

Sounds like your coil pack is getting moisture inside it. There is a hard protective resin on the bottom of the pack to protect the various electronic components. If it is even slightly compromised, the coil pack will arc inside causing a myriad of problems. Visually inspect the coil pack for any cracks (some will not be visible to the ***** eye) you can also do the old fashion spark test ( VERY HIGH VOLTAGE!) by putting a long insulated screwdriver in the end of each wire plug boot, hold shaft of screwdriver close to a ground source (@ 1/2 inch) and have someone crank the engine. Look that you have spark and also note the color or intensity of the arc. Ford single unit coil packs are notorious for becoming defective. DO NOT TRY TO SEAL A CRACK. The damage is done. If this resolves the problem, coat the underside with @ 1/64th inch thick coating of dielectric grease, Buy the big tube, you'll need it for other applications. It is always a good idea to use d.e. grease on all electrical connections, including battery terminals. It prevents corrosion, helps maintain a uninterrupted current. It also acts as a heat sink when applied to bulb bases and sockets. your bulbs will last much longer. Make sure both battery terminals are disconnected, turn the key to the on position after disconnecting the battery and wait a couple of minutes so the capacitors etc... drain any voltage the were holding. (this step not necessary for changing bulbs) I would recommend using d.g. on all connectors you can get to. DO NOT USE SPRAY LUBRICANTS ON CONNECTORS, THE LUBRICANT WILL HOLD AIRBORNE PARTICULATES (dust etc...) SOME OF WHICH HAVE METALLIC PROPERTIES.
Repair Help & Product Troubleshooting for 2004 Ford F150

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