Oil in air box
Thread Starter
CF Veteran
Joined: Feb 2013
Posts: 1,802
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From: Justin, TEXAS
Year: 1988
Model: Cherokee
Engine: 4.0
Hey cruiser, what does a stock egr valve look like? I noticed mine has the pick n pull "paint" on it so I know its not the original. Is it possible he replaced it with the wrong one? Because I was trying to do your egr valve test and I don't understand how to do it.
Thread Starter
CF Veteran
Joined: Feb 2013
Posts: 1,802
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From: Justin, TEXAS
Year: 1988
Model: Cherokee
Engine: 4.0
Well I plugged everything and pulled it off, still idling like crap, I'm trying to think of what else it could be, I've already got new map sensor, egr sensor, egr lines, bothe valve cover breathers and rear grommet, quadruple checked vac lines
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
It's just so weird because before I did all those egr tubes the thing ran perfect. Once I got All the hoses hooked up correctly, then this started
I don't know what could have changed.
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I put the rear breather tube to the valve in front of the throttle body
I don't know what could have changed.
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I put the rear breather tube to the valve in front of the throttle body
It's supposed to go through the metal CCV valve(orifice) in the grommet in the VC, with a little 2.4? mm hole that way restricts how much air it sucks. Then where it connects in front of the TB to the manifold, I wouldn't call a "valve" More of a port I guess. Really just a nipple to connect it to manifold vacuum.
Thread Starter
CF Veteran
Joined: Feb 2013
Posts: 1,802
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From: Justin, TEXAS
Year: 1988
Model: Cherokee
Engine: 4.0
That rear breather tube....do you have that running through the CCV orifice?
It's supposed to go through the metal CCV valve(orifice) in the grommet in the VC, with a little 2.4? mm hole that way restricts how much air it sucks. Then where it connects in front of the TB to the manifold, I wouldn't call a "valve" More of a port I guess. Really just a nipple to connect it to manifold vacuum.
It's supposed to go through the metal CCV valve(orifice) in the grommet in the VC, with a little 2.4? mm hole that way restricts how much air it sucks. Then where it connects in front of the TB to the manifold, I wouldn't call a "valve" More of a port I guess. Really just a nipple to connect it to manifold vacuum.
See here..
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
I'm calling it a night...Yea, I suppose the grommet looks right. I've never seen one out. The top looks right, and it should be restricted to a very small hole down in there. No harm in pulling that tube at the manifold, capping off the nipple there on the manifold for a second, and seeing it your idle smooths out. Would only take a minute.
On the tps I was shooten for .82. I found as I tightened the screws it would wander a bit. I got it pretty snug and where I could tap down on it to hit my .82, than finished snugging the screws.
On the tps I was shooten for .82. I found as I tightened the screws it would wander a bit. I got it pretty snug and where I could tap down on it to hit my .82, than finished snugging the screws.
Thread Starter
CF Veteran
Joined: Feb 2013
Posts: 1,802
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From: Justin, TEXAS
Year: 1988
Model: Cherokee
Engine: 4.0
I'm calling it a night...Yea, I suppose the grommet looks right. I've never seen one out. The top looks right, and it should be restricted to a very small hole down in there. No harm in pulling that tube at the manifold, capping off the nipple there on the manifold for a second, and seeing it your idle smooths out. Would only take a minute.
On the tps I was shooten for .82. I found as I tightened the screws it would wander a bit. I got it pretty snug and where I could tap down on it to hit my .82, than finished snugging the screws.
On the tps I was shooten for .82. I found as I tightened the screws it would wander a bit. I got it pretty snug and where I could tap down on it to hit my .82, than finished snugging the screws.
And that's funny cause I was shooting for .83 and when I tightened the bolts I got to .83
Thread Starter
CF Veteran
Joined: Feb 2013
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From: Justin, TEXAS
Year: 1988
Model: Cherokee
Engine: 4.0
I could be wrong but I don't think this is supposed to look like this, if it possible this being all oily and grimy could cause my rough idl
I did plug my egr and pulled off the little space ship thing, the spring inside was rusted to dust
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
That's normal, and it can cause all sorts of problems. Take care of it.
