Why won't my ruck start when it rains?

Asked by Apr 03, 2011 at 11:02 PM about the 1997 Dodge Ram 1500

Question type: Maintenance & Repair

When we moved from Denver, Colorado to Lancaster, SC last June, our 1500 wouldn't start  when it rained or in the mornings when there was heavy dew. In the afternoons, after it warmed up and dried out, it started fine. If I put it in the barn and covered the hood with a tarp and a blanket, it started  more reliably. I don't have the problem on dry days, and never had it in Colorado. Temperature is not a factor. Mechanics don't seem to have a clue. They want to replace plugs and wires and so forth. But it runs smooth. I don't think bad plugs are the problem. I thought it may have something to do with the thinner air in Denver, but that doesn't seem to raise any eyebrows with the mechanics.

8 Answers

11,785

try replacing your coolant temp sensor, its the master sensor when the engine is cold, also you may have to replace the MAF/baro sensors, worst comes to worst take it to a dealer and have them flash the computer it may have lost its ability to relearn new environments

3 out of 3 people think this is helpful.
605

Could be moisture in your distributor.

3 out of 3 people think this is helpful.
85

if your coil has a crack or an opening it may let moisture in also your map sensor may act up due to a drop in pressure this could also cause surging

2 out of 2 people think this is helpful.
70

I've had this same problem for3 years.Finally found it . Replaced the ignition coil and it's started ever since, even in wet weather outside.not the coil wire but the ignition coil itself. Cost about 45 dollars and only took about 20 or 30 mins, ThankGodIt'sFixed!

7 out of 7 people think this is helpful.
40

We have this same problem....changed the coil and the distributor cap. Did not fix. Changed the intake temp sensor. Did not fix. Why would coolant sensor fix this? Could it be the wires?? Help.

4 out of 4 people think this is helpful.
10

yeah , im grinding my teeth, i changed distributor cap ,distributor rotor ,new wires ,plugs were done last year and she still gives me a hard time ....

1 out of 1 people think this is helpful.
10

Husband's truck did the same thing. Mechanic changed the wires, spark plugs, distributor cap and rotor, good 1week. It ended up he changed the ignition coil and that fixed it! Ten minutes and $27, thanks to a post here!

1 out of 1 people think this is helpful.

2003 Dodge Ram van 5.2l. I purchased one with the no start when wet problem no start . Checked the obvious and then as I was tracing wires I found small puddle of water in the crank sensor on top of motor. It mounts on passenger side. I dyed it off with dryer and it started. I the man played with the wire that goes into sensor as it was running and touched motor and felt a slight volt charge to finger . I moved the wire around were they go threw the gel into sensor and van stalled. I removed sensor and cut open and found rusty wire and moisture. Installed new sensor and filled the little indent with rtv sealant so water does not sit there to gravity bleed into sensor. After rtv dried I wet it with hose including entire motor and no spuddering and starts up every time.

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