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Unread 02-14-2005, 02:03 PM   #1
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Join Date: Feb 2005
Location: Houston, TX
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fuel injector issue

Hey fellas, i have an MJ and a leaky fuel injector. I also think that my injectors maybe clogged. Anyone have any of these issues? would the injector leak due to worn o-rings? can my injectors be cleaned? should they be replaced? any assistance would be greatly appreciated.

1988 Comanche Chief 4.0 4X4 stick
109k miles on it
It's a piece of junk, but I love it!...most of the time.
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Unread 02-14-2005, 02:08 PM   #2
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1993 XJ Cherokee 
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Location: Austin, TX
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The injectors can leak if the O ring is bad. It will usually show itself with a wet injector base. Just take the injector out and put on a new O ring. They can be cleaned, but it's a good idea to have them pressure cleaned at a shop. Try running some SeaFOam in the next tank of gas and see if that doesn't clean them up a bit. Oriely's sells it.
93 Sport
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Unread 02-14-2005, 04:18 PM   #3
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Yes, worn O-rings can lead to a leaky injector, as can the injector itself being broken. Pull the suspect injector out, and carefully inspect it for cracks. Check the pinholes on the engine side of the injector, make sure they're intact and clean. If all is good, replace the O-ring and re-install.

Also, fuel injectors being clogged is more or less a myth...why do you think yours are clogged? The pressure coming through there inherently prevents dirt from clogging the injector. More likely that there is a lot of carbon buildup on the inside of the intake runners and cylinder head intake ports...there are cleaners out there that can clean that up but I think they're only available to shops and certified mechanics (this is what shops generally do when they sell you a "fuel injection cleaning"). The injector(s) could also be broken and not atomizing the fuel properly.
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Unread 02-14-2005, 04:23 PM   #4
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1982 CJ8 
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The injectors are sealed units. the oring on the bootmis to insure that there is n ot a vacum leak around the injector. if the oring is leaking on top it will leak fuel but if you have gas half way down on the out side of the injector . replace it. if one leaks the others are soon to follow. replace them all if you have them out. Peace of mind!!!
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Unread 02-14-2005, 05:48 PM   #5
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My injectors leaked between where the plastic and metal meet up. I had to replace mine. I used http://www.fiveomotorsport.com/ They treated me right and the price was great.
1988 Cherokee, 4.0 liter, Auto
4.5 inch Rusty's lift, 33x 12.50 MTR's
Adjustable upper and lower control arms
GPS, CB, OBA, XM radio
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