Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here XJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.

Black Plumes and Rough Idle

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Old Nov 3, 2022 | 10:32 AM
  #16  
robsjeep's Avatar
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From: San Mateo, CA
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0 Renix, stock.
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Originally Posted by cruiser54
Plugs are never pre-gapped except by us before we install them.
There is someone on Cherokee Forum that provides the correct injectors all refurbished.

There are MANY cheap chinese knock-off injectors out there. Get original rebuilt ones!! trevor.skankfootracing@gmail.com
True that!

I always check gals prior to install. Once and a while I find a bad one. Take nothing for granted, specially these days. quality has gone down the drain in so many ways, but even in the good ole days, I checked the gaps before instal.
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Old Nov 4, 2022 | 05:51 PM
  #17  
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From: Snow Hill, NC
Year: 1993
Model: Cherokee
Engine: 4.0 HO
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Update fellas,
I ended up finding my old injectors. Cleaned them up and bought new o-rings. Tested the resistance, all were 14.4 - 14.5. Cleaned them out by using a tire valve stem, carb cleaner, and alligator clips. Pulsed them a number of times with trick I saw on YouTube.
All were spraying as they should. Put some marvels mystery oil on o-rings and installed. Cranked right up and idling steady right under 1k RPM. I attached a screenshot of the injectors that I had ordered and it clearly says 30lbs… As my dad says “Ignorance can be expensive” so definitely a lesson learned. I appreciate all the help and advice from you guys. My old XJ definitely wouldn’t be where it is if I didn’t have this forum. Again thanks fellas!




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Old Nov 4, 2022 | 06:39 PM
  #18  
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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YAY!!
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Old Nov 8, 2022 | 10:38 AM
  #19  
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From: Long Island, New York
Year: 2001
Model: Cherokee (XJ)
Engine: 98 stroked 4.7
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Contact the people on ebay, who you purchased them from. They should offer you a replacement set of the proper flow for your model. I recently purchased a set from. elinjectors. They were too big so they sent me a replacement set, and all i had to do was ship them back. They were very helpful. The name is. elinjector
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Old Nov 8, 2022 | 03:15 PM
  #20  
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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I'd ask for a refund. Return them and get the correct ones from someone we can trust.
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