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Old Jan 5, 2016 | 07:59 AM
  #511  
madmanmarty's Avatar
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From: PA
Year: 1994
Model: Cherokee
Engine: 4.0 HO
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After looking at your pic,do u think your problem may be wiring & grounds?
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Old Jan 5, 2016 | 12:01 PM
  #512  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Originally Posted by madmanmarty
After looking at your pic,do u think your problem may be wiring & grounds?
I thought it might be grounds, ended up replacing them all with no luck. Need to find a way to clean up the wiring like running it all to a single control box or something haha, but haven't yet found something of the sort... Still need to do the relearn process for the ECU. It's been flooding itself from what I can tell by how much fuel is on the plugs that isn't being ignited even though I have spark, so I think it's more of an over fueling issue.. Which is why I need to do the relearn
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Old Jan 5, 2016 | 12:03 PM
  #513  
salad's Avatar
Herp Derp Jerp
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From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
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OBD-I PCM isn't going to be flooding itself that much. It would have dumped all of the learned fine-tuning and gone to default mapping when you installed it. Suspect timing or weak spark
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Old Jan 5, 2016 | 12:07 PM
  #514  
chipmaker's Avatar
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From: Belton S.C.
Year: 1998
Model: Cherokee
Engine: 4.0
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Fuel pressure regulator?
Had one go out on an exploder and it dumped so much gas in it was running out the tailpipe.
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Old Jan 5, 2016 | 12:09 PM
  #515  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Originally Posted by salad
OBD-I PCM isn't going to be flooding itself that much. It would have dumped all of the learned fine-tuning and gone to default mapping when you installed it. Suspect timing or weak spark
Weak spark would still ignite the fuel to an extent though wouldn't it? I mean it may not run like a champ, but in thoery would run.. I've let it sit a few days, tried it and it'll run a few seconds and then die again. But I definitely need to jump into the ignition system testing when I can find a spare hand
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Old Jan 5, 2016 | 12:11 PM
  #516  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Originally Posted by chipmaker
Fuel pressure regulator?
Had one go out on an exploder and it dumped so much gas in it was running out the tailpipe.
Is there a quick easy way to test that? I know it's got fuel pressure, but if the regulator is dumping to much it's a possibility
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Old Jan 5, 2016 | 12:17 PM
  #517  
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From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
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Originally Posted by 2tone92
Weak spark would still ignite the fuel to an extent though wouldn't it?
Not if it's too weak to ignite it

Originally Posted by 2tone92
Is there a quick easy way to test that? I know it's got fuel pressure, but if the regulator is dumping to much it's a possibility
Fuel pressure gauge on the test fitting. Or pull entire rail + injectors and watch the spray while cranking.
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Old Jan 5, 2016 | 12:21 PM
  #518  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Originally Posted by salad
Not if it's too weak to ignite it



Fuel pressure gauge on the test fitting. Or pull entire rail + injectors and watch the spray while cranking.
Sweet thanks! I'll have to test the ignition system when I get the change between work. And I think a fuel pressure gauge is the easier way to go there lol. Thanks again, I'll have to check it out here tomorrow probably
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Old Jan 5, 2016 | 12:55 PM
  #519  
wauto's Avatar
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From: Iowa
Year: 1995,1997
Model: Cherokee
Engine: 4.0
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Remove the vac line from the fuel psi regulator, cycle the fuel pump and see if fuel dribbles out of the vac port.

If the regulator is bad it can flood the intake with fuel.
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Old Jan 5, 2016 | 06:06 PM
  #520  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Well since I'm not sure how to upload videos... I can't show you the jeeps running, but after swapping in some performance plugs she fired right up!!
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Old Jan 5, 2016 | 06:31 PM
  #521  
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From: Belton S.C.
Year: 1998
Model: Cherokee
Engine: 4.0
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Originally Posted by 2tone92
Well since I'm not sure how to upload videos... I can't show you the jeeps running, but after swapping in some performance plugs she fired right up!!
Holy hell it's a miracle!!!
Your old plugs must have been fuel fouled. How's she doing?

Congrats!
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Old Jan 5, 2016 | 07:01 PM
  #522  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Originally Posted by chipmaker
Holy hell it's a miracle!!!
Your old plugs must have been fuel fouled. How's she doing?

Congrats!
You're telling me haha! Still got some kinks to work out, but she's purring like a kitten. And that's what I was thinking, so I went ahead and upgraded quite a bit over the old oem plugs. Double platinum iridium plugs lol
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Old Jan 5, 2016 | 07:35 PM
  #523  
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From: Belton S.C.
Year: 1998
Model: Cherokee
Engine: 4.0
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Originally Posted by 2tone92
You're telling me haha! Still got some kinks to work out, but she's purring like a kitten. And that's what I was thinking, so I went ahead and upgraded quite a bit over the old oem plugs. Double platinum iridium plugs lol
Hey whatever plug floats your goat.

Glad you finally got it going.
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Old Jan 5, 2016 | 07:44 PM
  #524  
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From: Alaska
Year: 1992
Model: Cherokee
Engine: Bored over 4.0 with HO performance head
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Originally Posted by chipmaker
Hey whatever plug floats your goat.

Glad you finally got it going.
Figured I might aswell with the extra cash I got lying around from house sitting haha. And me to! Now just gotta plumb the temp sensor for the gauge to the one for the ECU so I have a working gauge and bleed my clutch and she's ready for a test
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Old Jan 5, 2016 | 08:30 PM
  #525  
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From: west chester, pa
Year: 1999
Engine: 4.0
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Tsk tsk. All that goating and it was the plugs the whole time
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