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.

This cant be normal

Thread Tools
 
Search this Thread
 
Old Aug 5, 2011 | 12:06 AM
  #1  
A@ron's Avatar
Thread Starter
Junior Member
 
Joined: May 2010
Posts: 52
Likes: 0
From: Wisconsin and Colorado
Year: 1987
Model: Cherokee
Engine: 4.0 IL6
Default This cant be normal

Not sure if u can see in the picture but 4-6 injector connectors had a wet oily residue in them. What would be causing this?

Thank a bunch
Aaron
Attached Thumbnails This cant be normal-image-77311331.jpg  
Reply
Old Aug 5, 2011 | 12:17 AM
  #2  
lolz_jeep's Avatar
Senior Member
 
Joined: Apr 2011
Posts: 563
Likes: 0
From: Lima Ohio
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Default

could be bad injectors. or could be a bigger problem like leaky valves and the compression is forcing the fuel and air mixture up in to the injector... and intake. i would also take the TBI off and look in you intake manifold.
Reply
Old Aug 5, 2011 | 02:01 AM
  #3  
Slick761's Avatar
CF Veteran
 
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Default

Looks to me like something (maybe brake cleaner) was used and combined with heat melted the rubber plug or the plastic on the injector a bit.
Reply
Old Aug 5, 2011 | 02:05 AM
  #4  
Slick761's Avatar
CF Veteran
 
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Default

Originally Posted by lolz_jeep
could be bad injectors. or could be a bigger problem like leaky valves and the compression is forcing the fuel and air mixture up in to the injector... and intake. i would also take the TBI off and look in you intake manifold.
Dude.... no disrespect.... but no. That is not feasible. For one thing that is the electrical connector... for another if compression was coming back into the intake it would blow straight past the injector and through he throttle body...I don't know how else to put this.....

Last edited by Slick761; Aug 5, 2011 at 02:15 AM.
Reply
Old Aug 5, 2011 | 10:08 AM
  #5  
A@ron's Avatar
Thread Starter
Junior Member
 
Joined: May 2010
Posts: 52
Likes: 0
From: Wisconsin and Colorado
Year: 1987
Model: Cherokee
Engine: 4.0 IL6
Default

any other thoughts?
Reply
Old Aug 5, 2011 | 10:16 AM
  #6  
Slick761's Avatar
CF Veteran
 
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Default

Dude what do you want...... it is physical damage... instead of sitting there asking for more opinions why don't you go out and either pull em and replace em or suck it up and put it back together and run till there's an issue. There isn't much that can happen to the connector on an injector. Its not in the combustion chamber or the exhaust. THe only thing it is exposed to is heat and whatever chemicals the owner decides might be a good idea to throw at it... you see where I'm going with this?
Reply
Old Aug 5, 2011 | 10:56 AM
  #7  
lolz_jeep's Avatar
Senior Member
 
Joined: Apr 2011
Posts: 563
Likes: 0
From: Lima Ohio
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Default

Originally Posted by Slick761
Dude what do you want...... it is physical damage... instead of sitting there asking for more opinions why don't you go out and either pull em and replace em or suck it up and put it back together and run till there's an issue. There isn't much that can happen to the connector on an injector. Its not in the combustion chamber or the exhaust. THe only thing it is exposed to is heat and whatever chemicals the owner decides might be a good idea to throw at it... you see where I'm going with this?
your being a dick for no reason guy how bout you knock it off? this is what forums are for is to ask questions and get ideas. dont get hurt falling off your high horse Buddie.

Last edited by lolz_jeep; Aug 5, 2011 at 10:59 AM.
Reply
Old Aug 5, 2011 | 10:58 AM
  #8  
lolz_jeep's Avatar
Senior Member
 
Joined: Apr 2011
Posts: 563
Likes: 0
From: Lima Ohio
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Default

Originally Posted by Slick761
Dude.... no disrespect.... but no. That is not feasible. For one thing that is the electrical connector... for another if compression was coming back into the intake it would blow straight past the injector and through he throttle body...I don't know how else to put this.....
yea its possible trust me. and thats why i said to take off TBI and look in the manifold. how bout you take it down a couple notches.
Reply
Old Aug 5, 2011 | 11:02 AM
  #9  
Slick761's Avatar
CF Veteran
 
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Default

Like I said not meaning to be a Dick... but please explain how that is possible.
Reply
Old Aug 5, 2011 | 11:04 AM
  #10  
Slick761's Avatar
CF Veteran
 
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Default

Originally Posted by lolz_jeep

your being a dick for no reason guy how bout you knock it off? this is what forums are for is to ask questions and get ideas. dont get hurt falling off your high horse Buddie.
Op I apologise.... everyone's got their days. Forget I said anything
Reply
Old Aug 5, 2011 | 11:48 AM
  #11  
A@ron's Avatar
Thread Starter
Junior Member
 
Joined: May 2010
Posts: 52
Likes: 0
From: Wisconsin and Colorado
Year: 1987
Model: Cherokee
Engine: 4.0 IL6
Default

Slick why dont you go and trim your fenders

Thanks lolzjeep
Reply
Old Aug 5, 2011 | 11:54 AM
  #12  
Slick761's Avatar
CF Veteran
 
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Default

You got it. Have fun trying to blow that compression back through your injectors into the combustion chamber where it came from.:-D
Reply
Old Aug 5, 2011 | 12:04 PM
  #13  
PingPong's Avatar
CF Veteran
 
Joined: Jan 2009
Posts: 2,740
Likes: 0
Year: 87
Model: Cherokee
Engine: 4.0
Default

TO me this seems like fixing something till it is broken.

There is no physical way that oil can blow back up through an electrical connection. Taking off a TB to look into the intake to see what is wrong with a Fuel Injector is like looking in the exhaust to see what is wrong with a spark plug.


If it is working, and not leaking fuel (you would smell it and see it) I would put it back on and run it.
Reply
Old Aug 5, 2011 | 12:32 PM
  #14  
Gee oh Dee's Avatar
CF Veteran
 
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
Default

Moved to OEM tech.
Reply
Old Aug 5, 2011 | 12:38 PM
  #15  
Rustydog555's Avatar
Seasoned Member
 
Joined: Dec 2010
Posts: 251
Likes: 0
From: Orlando
Year: 1988
Model: Cherokee
Engine: 4.0
Default

just a thought but i greased all my connectors with no conducting grease???
Reply



All times are GMT -5. The time now is 03:24 AM.