Cranks over but will not start when it rains

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01-06-2008, 05:18 PM

TourRider

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Join Date: Jan 2008

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Cranks over but will not start when it rains

Have a 1998 Blazer LS 4.3 Automatic. Every time it rains and is humid it will crank but will not start. After a good dry day it fires right up. Anybody have an idea what I need to look for.
Thanks in advance,
TourRider

01-06-2008, 05:26 PM

2002XTREME

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Join Date: Oct 2007

Location: Long Island

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RE: Cranks over but will not start when it rains

sounds like an ignition problem... Like when a dist cap has a crack in it.....

01-06-2008, 05:34 PM

TourRider

Thread Starter

Join Date: Jan 2008

Posts: 3

RE: Cranks over but will not start when it rains

2002EXTREME......That is what I thought also,New distributor cap, rotor button and plug wires and still same problem. This is all I have tried so far and don't know where to look next.

01-06-2008, 05:39 PM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

Posts: 41,064

RE: Cranks over but will not start when it rains

When it is doing this, do you have spark? I would remove the coil pack and the ignition control module and have them tested. Both can be tested at Autozone or Advanced Auto. A cracked coil could be fine during low humidity and short in high humidity...