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2002 Chevy Blazer won't start after it rains

After it rains, I try to start my truck and it will turn over but not fire. When i let off turning over, sometimes the engine spins backwards.
I have spark and fuel and cant figure it out. If I come back the next day It will start and run normal. I have a new fuel pump, plugs and cap and rotor. My step-dad is good with cars and he can't seem to figure it out. He thinks it might be a sensor or something. Do you know what this could be?

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  • rfreed1 Aug 31, 2009

    thanks for the help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    I fixed that earlier problem with a cam positioning sensor that worked for a while. Now It just dont start at all and it has gas ans spark! It seems to be flooding it out. If you can actually HELP please let me know! thank you

  • yadayada
    yadayada May 11, 2010

    time for a trip to the dealer. U are just guessing here.

  • yadayada
    yadayada May 11, 2010

    time for a trip to the dealer.

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  • Chevrolet Master
  • 6,982 Answers

Porous ignition wires can do that..especially when they are damp....too much power is lost to ground on the way to the plugs while cranking. as you release the key, power to the starter is cut, supplying a bit more voltage to the coil, not turning quickly enough, the spark pushes the engine backwards a bit.

Posted on May 29, 2009

Testimonial: "It was the spark plug wires but only worked for a little while"

  • Richard Scordino Aug 31, 2009

    Your current problem is one you need to be there to fix...Beginning with the original problem, a poor wire connection can also give you a similar problem...when damp a connection can break down just enough to prevent starting. I'd keep that in mind while testing other components.I would begin by removing the plugs, re-checking the gaps and (keeping them in order) determine which if any are black, wet with fuel etc. This can tell you a lot about what is happening inside. Having fuel and spark is good but they have to happen at the correct time.Get a manual and a decent digital volt/ohmeter. The three components I'd check first are the throttle position sensor, the MAP sensor and the mass air flow sensor.I believe both haynes and chiltons have instructions for these basic tests.Together they have the most influence on ignition timing and fuel delivery.
    Assuming that you have not turned the distributor, the static timing should still be where it was before you had the problem. I would check the distributor shaft for side play though. if it's wobbling all over the place the distributor is bad. It would not hurt to do a compression test as well. Also, make sure the spark is healthy and not a little orange wimpy blip. Hope some of this helps!!


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