2004 Chevy Silverado 1500 runs rough or not at all in damp weather
Be at rest, witch doctor is here. Sounds like your problem is in the start circuit, not the ignition circuit which you have put new parts in, which is good for the car, not so great for your problem. This may require some on-site testing to find what's up, ratther than incantations across the internet. But it could be something as simple as a poor connection that damp weather exacerbates. I would thoroughly clean the battery posts and the cable connections, and tighten them down, and check the battery's ground connection. Clean and retighten that as well. Check all the ground connections you can find on and around the engine. Check the starter connections, also. In the start circuit there is more than the battery, starter, and ignition switch-a relay or two, a neutral safety switch (or clutch switch on manuals), and wiring going everywhere from here to Sunday...witch doctor going mad. Here's what you can do to help narrow it down: Buy a cheap $5.00 test light and wait and plot for that no crank condition. You will be checking if the starter solenoid on the starter is getting a power signal from the ignition switch when the key is held in crank (or start) position. (You need a helper to hold the key in start.) Pull off the small wire on the starter solenoid, ground the test light on a handy piece of metal. Check testlight by touching the positive battery post. Testlight should be bright if you have it grounded good. Now touch the tester probe to the wire you pulled off, and have helper hold the key in crank. If the light comes on, then switch to starter path is good, and the problem is in the battery to starter connections or the starter itself needs testing at a parts store to see if it needs replacing.
If the solenoid wire does not have power in start, then somewhat of a bigger problem, due to the many possibilities it could be. But, find the starter relay in the power distribution box by the battery. Hold your finger on it while helper turns key from off to cranking. Do you feel or hear a little click from the relay? If not, swap in another relay there and see if that helps. If you still haven't found the problem, you will probably need someone to look at it. I strongly suspect when you have cured the no crank in wet weather conditions, it will also cure the random mis-fire, which kind of suggests a poor electrical connection or component "somewhere". Witch doctor is tired, must give up. Check for moisture in and around the power disatribution box which might contribute to this.
And practice with the testlight when car is working good, so you can easily check the solenoid wire for power when the starter won't crank. Remember, when key is in crank position, the solenoid wire should have power. The solenoid actuates the starter.
Good luck. Hope you find it. Post back and let us know how it goes. Even witch doctors like feedback.
Jun 11, 2012 |
Cars & Trucks