Why will my 2000 Mitsubishi Montero not run when the humidity is high?

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Asked by GuruB184Z Jan 05, 2019 at 09:42 AM about the 2000 Mitsubishi Montero Sport LS 4WD

Question type: Maintenance & Repair

Whenever the humidity is high (especially in rainy weather or when it's been
foggy), my 2000 Montero Sport will finally start, but sputters and pops.  If I try
to give it gas, it dies.  I watch weather.com, and when the humidity drops
below 80 to 85%, I go out and start it with absolutely no problem, sounds
great, and revs the engine perfectly when I quickly depress the gas pedal.  I
have replaced the  3 coils, and that didn't help. I have a new set of plug wires
and plugs to put in, but it's not like just one of them is misfiring.  It's like all
the wires are crossed.  This started happening when I wasn't far from home,
and was able to try to get it back home again in low gear at a 5 mph idle.  By
the time I got it home, smoke was rolling out from under the hood, and a
driver going the other way thought it was on fire.  It wasn't.  I left the hood
open after I got home, and when the sun was out for a couple of hours and
the humidity came down, it started and ran perfectly fine again.  Ideas?

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GuruB184Z answered 5 years ago

Any Ideas where I could start looking? A couple of the shops around here have said to bring it in, and they will run some diagnostics. I don't know how they can diagnose a problem when it isn't happening, because when the humidity is under 80% it runs great, not even an occasional miss! When the humidity is high, and I can barely keep it running at an idle, I can't get it to the shop to get it checked. I'm located in the upper mid-west, and really miss my 4-Wheel Drive, especially now that winter snows have started.

2 people found this helpful.

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20

GuruB184Z answered 5 years ago

Where are all of the car guru experts when you need them? I posted the original question a month and a half ago, and not a single response.

Mark helpful

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