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STUPID JEEP

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Old 10-09-2013 | 07:12 PM
  #16  
Big David's Avatar
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From: Gainesville GA
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
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Originally Posted by McCaffrey
My 89 floods when it rains too, but mostly just the cabin. I keep saying I'm going to swap-out the wing windows with later model that don't open.
RTV will fix them.
Old 10-09-2013 | 08:57 PM
  #17  
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From: Ramona ca
Year: 1990
Model: Cherokee
Engine: 4.0
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Came home jeep starts I have spark. It seems like I Dont Know if it's the water issue or temperature issue but one of those is causing her to not send fire into the holes
Old 10-10-2013 | 09:29 AM
  #18  
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From: Chicago
Year: 1998
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Engine: 4.0
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If it doesn't fire when it's damp out, something is getting moist and causing the ignition system to too weak. Electricity takes the path of least resistance and moisture forms a nice bridge to ground.

Here's another thing you could do. Pick up a in line "spark checker". It plugs in line inbetween a plug wire lead and the spark plug head. Do this in a somewhat darker area. Have an assistant crank the engine when it's dry out. You should have a nice hot blue spark visible in the sight glass. And I'm willing to bet that when you perform this same test when it's damp, some where amongst the coil to one or all of the plugs will show a weak orange spark in the sight glass.

Other than that, are you sure you have the right plugs? Gapped them correctly? And have the correct firing order. Did you buy a set a Duracrap wires and rotor Autozone?
Old 10-10-2013 | 10:26 AM
  #19  
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From: north, ga
Year: 1995
Model: Cherokee
Engine: 4.0
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Originally Posted by dwright98xj
If it doesn't fire when it's damp out, something is getting moist and causing the ignition system to too weak. Electricity takes the path of least resistance and moisture forms a nice bridge to ground.

Here's another thing you could do. Pick up a in line "spark checker". It plugs in line inbetween a plug wire lead and the spark plug head. Do this in a somewhat darker area. Have an assistant crank the engine when it's dry out. You should have a nice hot blue spark visible in the sight glass. And I'm willing to bet that when you perform this same test when it's damp, some where amongst the coil to one or all of the plugs will show a weak orange spark in the sight glass.

Other than that, are you sure you have the right plugs? Gapped them correctly? And have the correct firing order. Did you buy a set a Duracrap wires and rotor Autozone?
When you check for spark remove the fuel pump relay
Old 10-10-2013 | 12:34 PM
  #20  
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From: Ramona ca
Year: 1990
Model: Cherokee
Engine: 4.0
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I have the copper plugs for the jeep and all that is golden it started this morning and ran fine nothing under the hood is wet and nopthing undwer the dash is wet so i dont think its a water issue i think its a temp issue when it gets cold out something in the ignition ssytem stops worki ng for a while
Old 10-10-2013 | 12:49 PM
  #21  
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From: Chicago
Year: 1998
Model: Cherokee
Engine: 4.0
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Originally Posted by Kris smith
i think its a temp issue when it gets cold out something in the ignition ssytem stops worki ng for a while
San Diego and cold in the same sentence???? Climate change???

Anyway, just the slightest bit of moisture (ie condensation) is all it takes. Like dried up long before you started it last night and for sure dried out the rest as it warmed up.

I'm telling ya, this is a classic case. Long before OBD was fart whistle in the wind, ignition systems behaved just the same. Unless you're saying on a "cold" (lol) DRY day it does the same, I stand by my prognosis.
Old 10-10-2013 | 05:25 PM
  #22  
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From: Ramona ca
Year: 1990
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Yes on a cold dry day I would do the same thing earlier this year when I first got it it was doing the same thing. The only thing not new in the ignitionsystem is the coil
Old 10-11-2013 | 09:35 AM
  #23  
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Checking the coil with an ohm meter is quick and simple.
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