No start after heavy rain -
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post #1 of 8 Old 04-23-2011, 11:48 AM Thread Starter
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1996 ZJ 
Join Date: Apr 2011
Location: Burlington
Posts: 44
No start after heavy rain

Hi guys, some electricals gremlins somewhere: car is parked outside and engine won't start after a heavy rain (the engine compartment is bone dry). This is the 3rd or 4th time it happens. It's been at least 3 hours now since the rain has stopped and still no start. It will most likley start a bit later in the afternoon. Last time it did this I sprayed the ignition wires and ditributor cap with WD40 but did not help. A colleague of mine mentioned a very similar experience he had with another Chrysler car and it was an electronic module in the engine compartment that was sensitive to excess humidity in the air and would not work. Any clues? patient is a 1996 Grand Cherokee Laredo (inline 6). Thank you very much,


gstroe is offline  
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post #2 of 8 Old 04-23-2011, 12:30 PM
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1976 FSJ Cherokee 
Join Date: Jan 2011
Location: Des Moines
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Chryslers seem to be notorious for the Distributor cap being the issue after a heavy rain.

97 ZJ - Stock again
1976 Chief AMC 360 6 in lift, 35 inch tires

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post #3 of 8 Old 04-23-2011, 02:56 PM
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1998 ZJ 
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Location: Middleport
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?? Bad grounds, PCM connections, short elsewhere in electrical system,??
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post #4 of 8 Old 04-23-2011, 04:39 PM
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1994 ZJ 
Join Date: Jan 2005
Location: New York's Hudson Valley
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I have seen problems with not starting or stalling with just a little moisture with just a hairline crack in the distributer cap. I would look there first.
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post #5 of 8 Old 04-28-2011, 03:37 AM
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1980 CJ7 
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same ^^^.moisture in the cap.

80 cj7
boys 79 cj5
daughters 87 xj build
youngest girl 79 cj5
mudpuppy_n_jeep is offline  
post #6 of 8 Old 04-28-2011, 07:41 AM
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Yes check the cap..Also unhook the battery and then unplug your ECM and check for moisture in the plug-ins if you find some blow it out with some air and apply some dielectric grease on the plug-ins to keep out the moisture.
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post #7 of 8 Old 04-28-2011, 08:09 AM
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2004 WJ 
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Put ty-wraps around your PCM connectors like in the picture below....
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zeejay pcm.jpg  
JS97ZJ is offline  
post #8 of 8 Old 04-29-2011, 09:21 PM Thread Starter
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1996 ZJ 
Join Date: Apr 2011
Location: Burlington
Posts: 44
Thank you very much guys! I will obviously replace the distributor cap and hope this was the problem. Will know at the first heavy rain....

gstroe is offline  

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